{"id":2910,"date":"2023-07-14T14:00:22","date_gmt":"2023-07-14T06:00:22","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=2910"},"modified":"2023-07-14T14:00:24","modified_gmt":"2023-07-14T06:00:24","slug":"jvm%ef%bc%88java%e8%99%9a%e6%8b%9f%e6%9c%ba%ef%bc%89-%e5%8f%b2%e4%b8%8a%e6%9c%80%e5%85%a8%e3%80%81%e6%9c%80%e8%af%a6%e7%bb%86jvm%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/jvm\/jvm%ef%bc%88java%e8%99%9a%e6%8b%9f%e6%9c%ba%ef%bc%89-%e5%8f%b2%e4%b8%8a%e6%9c%80%e5%85%a8%e3%80%81%e6%9c%80%e8%af%a6%e7%bb%86jvm%e7%ac%94%e8%ae%b0\/","title":{"rendered":"JVM\uff08Java\u865a\u62df\u673a\uff09-\u53f2\u4e0a\u6700\u5168\u3001\u6700\u8be6\u7ec6JVM\u7b14\u8bb0"},"content":{"rendered":"<div id=\"content_views\" class=\"htmledit_views\">\n<h1 id=\"%E7%9B%AE%E5%BD%95\">\u76ee\u5f55<\/h1>\n<p id=\"%E4%B8%80%E3%80%81JVM%E6%A6%82%E8%BF%B0-toc\" style=\"margin-left: 0px;\"><a href=\"#%E4%B8%80%E3%80%81JVM%E6%A6%82%E8%BF%B0\" target=\"_blank\"  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>1\u30014JVM\u6574\u4f53\u7ec4\u6210\u90e8\u5206\u00a0<\/a><\/p>\n<p id=\"%E4%BA%8C%E3%80%81JVM%E7%BB%93%E6%9E%84--%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8-toc\" style=\"margin-left: 0px;\"><a href=\"#%E4%BA%8C%E3%80%81JVM%E7%BB%93%E6%9E%84--%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8\" target=\"_blank\"  rel=\"nofollow\" >\u4e8c\u3001JVM\u7ed3\u6784--\u7c7b\u52a0\u8f7d\u5668<\/a><\/p>\n<p id=\"2%E3%80%811%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%AD%90%E7%B3%BB%E7%BB%9F-toc\" style=\"margin-left: 40px;\"><a href=\"#2%E3%80%811%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%AD%90%E7%B3%BB%E7%BB%9F\" target=\"_blank\"  rel=\"nofollow\" >2\u30011\u7c7b\u52a0\u8f7d\u5b50\u7cfb\u7edf<\/a><\/p>\n<p id=\"2%E3%80%812%E7%B1%BB%E5%8A%A0%E8%BD%BD%E8%BF%87%E7%A8%8B-toc\" style=\"margin-left: 40px;\"><a href=\"#2%E3%80%812%E7%B1%BB%E5%8A%A0%E8%BD%BD%E8%BF%87%E7%A8%8B\" target=\"_blank\"  rel=\"nofollow\" >2\u30012\u7c7b\u52a0\u8f7d\u8fc7\u7a0b<\/a><\/p>\n<p id=\"2%E3%80%812%E3%80%811%E5%8A%A0%E8%BD%BD-toc\" style=\"margin-left: 80px;\"><a href=\"#2%E3%80%812%E3%80%811%E5%8A%A0%E8%BD%BD\" target=\"_blank\"  rel=\"nofollow\" >2\u30012\u30011\u52a0\u8f7d<\/a><\/p>\n<p id=\"2%E3%80%812%E3%80%812%E9%93%BE%E6%8E%A5-toc\" style=\"margin-left: 80px;\"><a href=\"#2%E3%80%812%E3%80%812%E9%93%BE%E6%8E%A5\" target=\"_blank\"  rel=\"nofollow\" >2\u30012\u30012\u94fe\u63a5<\/a><\/p>\n<p id=\"2%E3%80%812%E3%80%813%E5%88%9D%E5%A7%8B%E5%8C%96-toc\" style=\"margin-left: 80px;\"><a href=\"#2%E3%80%812%E3%80%813%E5%88%9D%E5%A7%8B%E5%8C%96\" target=\"_blank\"  rel=\"nofollow\" >2\u30012\u30013\u521d\u59cb\u5316<\/a><\/p>\n<p id=\"2%E3%80%813%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%E5%88%86%E7%B1%BB-toc\" style=\"margin-left: 40px;\"><a href=\"#2%E3%80%813%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%E5%88%86%E7%B1%BB\" target=\"_blank\"  rel=\"nofollow\" >2\u30013\u7c7b\u52a0\u8f7d\u5668\u5206\u7c7b<\/a><\/p>\n<p id=\"2.3.1%20%E5%BC%95%E5%AF%BC%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8(%E5%90%AF%E5%8A%A8%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%20BootStrap%20ClassLoader)-toc\" style=\"margin-left: 80px;\"><a href=\"#2.3.1%20%E5%BC%95%E5%AF%BC%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%28%E5%90%AF%E5%8A%A8%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%20BootStrap%20ClassLoader%29\" target=\"_blank\"  rel=\"nofollow\" >2.3.1 \u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668(\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668 BootStrap ClassLoader)<\/a><\/p>\n<p id=\"2.3.2%20%E6%89%A9%E5%B1%95%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8(Extension%20ClassLoader)-toc\" style=\"margin-left: 80px;\"><a href=\"#2.3.2%20%E6%89%A9%E5%B1%95%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%28Extension%20ClassLoader%29\" target=\"_blank\"  rel=\"nofollow\" >2.3.2 \u6269\u5c55\u7c7b\u52a0\u8f7d\u5668(Extension ClassLoader)<\/a><\/p>\n<p id=\"2.3.3%20%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8(%E7%B3%BB%E7%BB%9F%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%20Application%20ClassLoader)-toc\" style=\"margin-left: 80px;\"><a href=\"#2.3.3%20%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%28%E7%B3%BB%E7%BB%9F%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%20Application%20ClassLoader%29\" target=\"_blank\"  rel=\"nofollow\" >2.3.3 \u5e94\u7528\u7a0b\u5e8f\u7c7b\u52a0\u8f7d\u5668(\u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668 Application ClassLoader)<\/a><\/p>\n<p id=\"2.4%20%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE%E6%9C%BA%E5%88%B6-toc\" style=\"margin-left: 40px;\"><a href=\"#2.4%20%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE%E6%9C%BA%E5%88%B6\" target=\"_blank\"  rel=\"nofollow\" >2.4 \u53cc\u4eb2\u59d4\u6d3e\u673a\u5236<\/a><\/p>\n<p id=\"2.5%20%E5%A6%82%E4%BD%95%E6%89%93%E7%A0%B4%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE%E6%9C%BA%E5%88%B6-toc\" style=\"margin-left: 40px;\"><a href=\"#2.5%20%E5%A6%82%E4%BD%95%E6%89%93%E7%A0%B4%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE%E6%9C%BA%E5%88%B6\" target=\"_blank\"  rel=\"nofollow\" >2.5 \u5982\u4f55\u6253\u7834\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236<\/a><\/p>\n<p id=\"%E4%B8%89%E3%80%81JVM%E8%BF%90%E8%A1%8C%E6%97%B6%E6%95%B0%E6%8D%AE%E5%8C%BA-toc\" style=\"margin-left: 0px;\"><a href=\"#%E4%B8%89%E3%80%81JVM%E8%BF%90%E8%A1%8C%E6%97%B6%E6%95%B0%E6%8D%AE%E5%8C%BA\" target=\"_blank\"  rel=\"nofollow\" >\u4e09\u3001JVM\u8fd0\u884c\u65f6\u6570\u636e\u533a<\/a><\/p>\n<p id=\"3%E3%80%811%E8%BF%90%E8%A1%8C%E6%97%B6%E6%95%B0%E6%8D%AE%E5%8C%BA%E7%BB%84%E6%88%90%E6%A6%82%E8%BF%B0-toc\" style=\"margin-left: 40px;\"><a href=\"#3%E3%80%811%E8%BF%90%E8%A1%8C%E6%97%B6%E6%95%B0%E6%8D%AE%E5%8C%BA%E7%BB%84%E6%88%90%E6%A6%82%E8%BF%B0\" target=\"_blank\"  rel=\"nofollow\" >3\u30011\u8fd0\u884c\u65f6\u6570\u636e\u533a\u7ec4\u6210\u6982\u8ff0<\/a><\/p>\n<p id=\"3.1.1%20%E7%A8%8B%E5%BA%8F%E8%AE%A1%E6%95%B0%E5%99%A8%EF%BC%88Program%20Counter%20Register%EF%BC%89-toc\" style=\"margin-left: 80px;\"><a href=\"#3.1.1%20%E7%A8%8B%E5%BA%8F%E8%AE%A1%E6%95%B0%E5%99%A8%EF%BC%88Program%20Counter%20Register%EF%BC%89\" target=\"_blank\"  rel=\"nofollow\" >3.1.1 \u7a0b\u5e8f\u8ba1\u6570\u5668\uff08Program Counter Register\uff09<\/a><\/p>\n<p id=\"3.1.2Java%20%E8%99%9A%E6%8B%9F%E6%9C%BA%E6%A0%88%EF%BC%88Java%20Virtual%20Machine%20Stacks%EF%BC%89-toc\" style=\"margin-left: 80px;\"><a href=\"#3.1.2Java%20%E8%99%9A%E6%8B%9F%E6%9C%BA%E6%A0%88%EF%BC%88Java%20Virtual%20Machine%20Stacks%EF%BC%89\" target=\"_blank\"  rel=\"nofollow\" >3.1.2Java \u865a\u62df\u673a\u6808\uff08Java Virtual Machine Stacks\uff09<\/a><\/p>\n<p id=\"3.1.3%20%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95%E6%A0%88%EF%BC%88Native%20Method%20Stack%EF%BC%89-toc\" style=\"margin-left: 80px;\"><a href=\"#3.1.3%20%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95%E6%A0%88%EF%BC%88Native%20Method%20Stack%EF%BC%89\" target=\"_blank\"  rel=\"nofollow\" >3.1.3 \u672c\u5730\u65b9\u6cd5\u6808\uff08Native Method Stack\uff09<\/a><\/p>\n<p id=\"3.1.4Java%20%E5%A0%86%EF%BC%88Java%20Heap%EF%BC%89-toc\" style=\"margin-left: 80px;\"><a href=\"#3.1.4Java%20%E5%A0%86%EF%BC%88Java%20Heap%EF%BC%89\" target=\"_blank\"  rel=\"nofollow\" >3.1.4Java \u5806\uff08Java Heap\uff09<\/a><\/p>\n<p id=\"3.1.5%20%E6%96%B9%E6%B3%95%E5%8C%BA%EF%BC%88Methed%20Area%EF%BC%89-toc\" style=\"margin-left: 80px;\"><a href=\"#3.1.5%20%E6%96%B9%E6%B3%95%E5%8C%BA%EF%BC%88Methed%20Area%EF%BC%89\" target=\"_blank\"  rel=\"nofollow\" >3.1.5 \u65b9\u6cd5\u533a\uff08Methed Area\uff09<\/a><\/p>\n<p id=\"3.2.%E7%A8%8B%E5%BA%8F%E8%AE%A1%E6%95%B0%E5%99%A8%EF%BC%88Program%20Counter%20Register%EF%BC%89-toc\" style=\"margin-left: 40px;\"><a href=\"#3.2.%E7%A8%8B%E5%BA%8F%E8%AE%A1%E6%95%B0%E5%99%A8%EF%BC%88Program%20Counter%20Register%EF%BC%89\" target=\"_blank\"  rel=\"nofollow\" >3.2.\u7a0b\u5e8f\u8ba1\u6570\u5668\uff08Program Counter Register\uff09<\/a><\/p>\n<p id=\"3.3.Java%20%E8%99%9A%E6%8B%9F%E6%9C%BA%E6%A0%88%EF%BC%88Java%20Virtual%20Machine%20Stacks%EF%BC%89-toc\" style=\"margin-left: 40px;\"><a href=\"#3.3.Java%20%E8%99%9A%E6%8B%9F%E6%9C%BA%E6%A0%88%EF%BC%88Java%20Virtual%20Machine%20Stacks%EF%BC%89\" target=\"_blank\"  rel=\"nofollow\" >3.3.Java \u865a\u62df\u673a\u6808\uff08Java Virtual Machine Stacks\uff09<\/a><\/p>\n<p id=\"3.4.%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95%E6%A0%88(Native%20Method%20Stack)-toc\" style=\"margin-left: 40px;\"><a href=\"#3.4.%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95%E6%A0%88%28Native%20Method%20Stack%29\" target=\"_blank\"  rel=\"nofollow\" >3.4.\u672c\u5730\u65b9\u6cd5\u6808(Native Method Stack)<\/a><\/p>\n<p id=\"3.5.Java%20%E5%A0%86%E5%86%85%E5%AD%98-toc\" style=\"margin-left: 40px;\"><a href=\"#3.5.Java%20%E5%A0%86%E5%86%85%E5%AD%98\" target=\"_blank\"  rel=\"nofollow\" >3.5.Java \u5806\u5185\u5b58<\/a><\/p>\n<p id=\"3.5.1Java%E5%A0%86%E5%86%85%E5%AD%98%E6%A6%82%E8%BF%B0-toc\" style=\"margin-left: 80px;\"><a href=\"#3.5.1Java%E5%A0%86%E5%86%85%E5%AD%98%E6%A6%82%E8%BF%B0\" target=\"_blank\"  rel=\"nofollow\" >3.5.1Java\u5806\u5185\u5b58\u6982\u8ff0<\/a><\/p>\n<p id=\"3.5.2%E5%A0%86%E5%86%85%E5%AD%98%E5%8C%BA%E5%9F%9F%E5%88%92%E5%88%86-toc\" style=\"margin-left: 80px;\"><a href=\"#3.5.2%E5%A0%86%E5%86%85%E5%AD%98%E5%8C%BA%E5%9F%9F%E5%88%92%E5%88%86\" target=\"_blank\"  rel=\"nofollow\" >3.5.2\u5806\u5185\u5b58\u533a\u57df\u5212\u5206<\/a><\/p>\n<p id=\"3.5.3%20%E4%B8%BA%E4%BB%80%E4%B9%88%E5%88%86%E5%8C%BA(%E4%BB%A3)%EF%BC%9F-toc\" style=\"margin-left: 80px;\"><a href=\"#3.5.3%20%E4%B8%BA%E4%BB%80%E4%B9%88%E5%88%86%E5%8C%BA%28%E4%BB%A3%29%EF%BC%9F\" target=\"_blank\"  rel=\"nofollow\" >3.5.3 \u4e3a\u4ec0\u4e48\u5206\u533a(\u4ee3)\uff1f<\/a><\/p>\n<p id=\"3.5.4%20%E5%AF%B9%E8%B1%A1%E5%88%9B%E5%BB%BA%E5%86%85%E5%AD%98%E5%88%86%E9%85%8D%E8%BF%87%E7%A8%8B-toc\" style=\"margin-left: 80px;\"><a href=\"#3.5.4%20%E5%AF%B9%E8%B1%A1%E5%88%9B%E5%BB%BA%E5%86%85%E5%AD%98%E5%88%86%E9%85%8D%E8%BF%87%E7%A8%8B\" target=\"_blank\"  rel=\"nofollow\" >3.5.4 \u5bf9\u8c61\u521b\u5efa\u5185\u5b58\u5206\u914d\u8fc7\u7a0b<\/a><\/p>\n<p id=\"3.5.5%20%E6%96%B0%E7%94%9F%E5%8C%BA%E4%B8%8E%E8%80%81%E5%B9%B4%E5%8C%BA%E9%85%8D%E7%BD%AE%E6%AF%94%E4%BE%8B-toc\" style=\"margin-left: 80px;\"><a href=\"#3.5.5%20%E6%96%B0%E7%94%9F%E5%8C%BA%E4%B8%8E%E8%80%81%E5%B9%B4%E5%8C%BA%E9%85%8D%E7%BD%AE%E6%AF%94%E4%BE%8B\" target=\"_blank\"  rel=\"nofollow\" >3.5.5 \u65b0\u751f\u533a\u4e0e\u8001\u5e74\u533a\u914d\u7f6e\u6bd4\u4f8b<\/a><\/p>\n<p id=\"%C2%A03.5.6%20%E5%88%86%E4%BB%A3%E6%94%B6%E9%9B%86%E6%80%9D%E6%83%B3%20Minor%20GC%E3%80%81Major%20GC%E3%80%81Full%20GC-toc\" style=\"margin-left: 80px;\"><a href=\"#%C2%A03.5.6%20%E5%88%86%E4%BB%A3%E6%94%B6%E9%9B%86%E6%80%9D%E6%83%B3%20Minor%20GC%E3%80%81Major%20GC%E3%80%81Full%20GC\" target=\"_blank\"  rel=\"nofollow\" >\u00a03.5.6 \u5206\u4ee3\u6536\u96c6\u601d\u60f3 Minor GC\u3001Major GC\u3001Full GC<\/a><\/p>\n<p id=\"3.5.7%20%E5%A0%86%E7%A9%BA%E9%97%B4%E7%9A%84%E5%8F%82%E6%95%B0%E8%AE%BE%E7%BD%AE-toc\" style=\"margin-left: 80px;\"><a href=\"#3.5.7%20%E5%A0%86%E7%A9%BA%E9%97%B4%E7%9A%84%E5%8F%82%E6%95%B0%E8%AE%BE%E7%BD%AE\" target=\"_blank\"  rel=\"nofollow\" >3.5.7 \u5806\u7a7a\u95f4\u7684\u53c2\u6570\u8bbe\u7f6e<\/a><\/p>\n<p id=\"3.5.8%20%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%B8%B8%E9%87%8F%E6%B1%A0-toc\" style=\"margin-left: 80px;\"><a href=\"#3.5.8%20%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%B8%B8%E9%87%8F%E6%B1%A0\" target=\"_blank\"  rel=\"nofollow\" >3.5.8 \u5b57\u7b26\u4e32\u5e38\u91cf\u6c60<\/a><\/p>\n<p id=\"3.6%E6%96%B9%E6%B3%95%E5%8C%BA-toc\" style=\"margin-left: 40px;\"><a href=\"#3.6%E6%96%B9%E6%B3%95%E5%8C%BA\" target=\"_blank\"  rel=\"nofollow\" >3.6\u65b9\u6cd5\u533a<\/a><\/p>\n<p id=\"3.6.1%20%E6%96%B9%E6%B3%95%E5%8C%BA%E7%9A%84%E5%9F%BA%E6%9C%AC%E7%90%86%E8%A7%A3-toc\" style=\"margin-left: 80px;\"><a href=\"#3.6.1%20%E6%96%B9%E6%B3%95%E5%8C%BA%E7%9A%84%E5%9F%BA%E6%9C%AC%E7%90%86%E8%A7%A3\" target=\"_blank\"  rel=\"nofollow\" >3.6.1 \u65b9\u6cd5\u533a\u7684\u57fa\u672c\u7406\u89e3<\/a><\/p>\n<p id=\"3.6.2%20%E6%96%B9%E6%B3%95%E5%8C%BA%E5%A4%A7%E5%B0%8F%E8%AE%BE%E7%BD%AE-toc\" style=\"margin-left: 80px;\"><a href=\"#3.6.2%20%E6%96%B9%E6%B3%95%E5%8C%BA%E5%A4%A7%E5%B0%8F%E8%AE%BE%E7%BD%AE\" target=\"_blank\"  rel=\"nofollow\" >3.6.2 \u65b9\u6cd5\u533a\u5927\u5c0f\u8bbe\u7f6e<\/a><\/p>\n<p id=\"3.6.3%C2%A0%E6%96%B9%E6%B3%95%E5%8C%BA%E7%9A%84%E5%86%85%E9%83%A8%E7%BB%93%E6%9E%84-toc\" style=\"margin-left: 80px;\"><a href=\"#3.6.3%C2%A0%E6%96%B9%E6%B3%95%E5%8C%BA%E7%9A%84%E5%86%85%E9%83%A8%E7%BB%93%E6%9E%84\" target=\"_blank\"  rel=\"nofollow\" >3.6.3\u00a0\u65b9\u6cd5\u533a\u7684\u5185\u90e8\u7ed3\u6784<\/a><\/p>\n<p id=\"3.6.4%C2%A0%E6%96%B9%E6%B3%95%E5%8C%BA%E7%9A%84%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6-toc\" style=\"margin-left: 80px;\"><a href=\"#3.6.4%C2%A0%E6%96%B9%E6%B3%95%E5%8C%BA%E7%9A%84%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6\" target=\"_blank\"  rel=\"nofollow\" >3.6.4\u00a0\u65b9\u6cd5\u533a\u7684\u5783\u573e\u56de\u6536<\/a><\/p>\n<p id=\"%E5%9B%9B%E3%80%81%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95%E6%8E%A5%E5%8F%A3-toc\" style=\"margin-left: 0px;\"><a href=\"#%E5%9B%9B%E3%80%81%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95%E6%8E%A5%E5%8F%A3\" target=\"_blank\"  rel=\"nofollow\" >\u56db\u3001\u672c\u5730\u65b9\u6cd5\u63a5\u53e3<\/a><\/p>\n<p id=\"%C2%A04.1%20%E4%BB%80%E4%B9%88%E6%98%AF%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95-toc\" style=\"margin-left: 80px;\"><a href=\"#%C2%A04.1%20%E4%BB%80%E4%B9%88%E6%98%AF%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95\" target=\"_blank\"  rel=\"nofollow\" >\u00a04.1 \u4ec0\u4e48\u662f\u672c\u5730\u65b9\u6cd5<\/a><\/p>\n<p id=\"4.2%20%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E4%BD%BF%E7%94%A8%20Native%20Method-toc\" style=\"margin-left: 80px;\"><a href=\"#4.2%20%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E4%BD%BF%E7%94%A8%20Native%20Method\" target=\"_blank\"  rel=\"nofollow\" >4.2 \u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528 Native Method<\/a><\/p>\n<p id=\"%E4%BA%94%E3%80%81%E6%89%A7%E8%A1%8C%E5%BC%95%E6%93%8E-toc\" style=\"margin-left: 0px;\"><a href=\"#%E4%BA%94%E3%80%81%E6%89%A7%E8%A1%8C%E5%BC%95%E6%93%8E\" target=\"_blank\"  rel=\"nofollow\" >\u4e94\u3001\u6267\u884c\u5f15\u64ce<\/a><\/p>\n<p id=\"5.1%20%E6%A6%82%E8%BF%B0-toc\" style=\"margin-left: 80px;\"><a href=\"#5.1%20%E6%A6%82%E8%BF%B0\" target=\"_blank\"  rel=\"nofollow\" >5.1 \u6982\u8ff0<\/a><\/p>\n<p id=\"5.2%20%E4%BB%80%E4%B9%88%E6%98%AF%E8%A7%A3%E9%87%8A%E5%99%A8%EF%BC%9F%E4%BB%80%E4%B9%88%E6%98%AF%20JIT%20%E7%BC%96%E8%AF%91%E5%99%A8%EF%BC%9F-toc\" style=\"margin-left: 80px;\"><a href=\"#5.2%20%E4%BB%80%E4%B9%88%E6%98%AF%E8%A7%A3%E9%87%8A%E5%99%A8%EF%BC%9F%E4%BB%80%E4%B9%88%E6%98%AF%20JIT%20%E7%BC%96%E8%AF%91%E5%99%A8%EF%BC%9F\" target=\"_blank\"  rel=\"nofollow\" >5.2 \u4ec0\u4e48\u662f\u89e3\u91ca\u5668\uff1f\u4ec0\u4e48\u662f JIT \u7f16\u8bd1\u5668\uff1f<\/a><\/p>\n<p id=\"5.3%20%E4%B8%BA%E4%BB%80%E4%B9%88%20Java%20%E6%98%AF%E5%8D%8A%E7%BC%96%E8%AF%91%E5%8D%8A%E8%A7%A3%E9%87%8A%E5%9E%8B%E8%AF%AD%E8%A8%80%EF%BC%9F-toc\" style=\"margin-left: 80px;\"><a href=\"#5.3%20%E4%B8%BA%E4%BB%80%E4%B9%88%20Java%20%E6%98%AF%E5%8D%8A%E7%BC%96%E8%AF%91%E5%8D%8A%E8%A7%A3%E9%87%8A%E5%9E%8B%E8%AF%AD%E8%A8%80%EF%BC%9F\" target=\"_blank\"  rel=\"nofollow\" >5.3 \u4e3a\u4ec0\u4e48 Java \u662f\u534a\u7f16\u8bd1\u534a\u89e3\u91ca\u578b\u8bed\u8a00\uff1f<\/a><\/p>\n<p id=\"%E5%85%AD%E3%80%81%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6-toc\" style=\"margin-left: 0px;\"><a href=\"#%E5%85%AD%E3%80%81%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6\" target=\"_blank\"  rel=\"nofollow\" >\u516d\u3001\u5783\u573e\u56de\u6536<\/a><\/p>\n<p id=\"6.1%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E6%A6%82%E8%BF%B0-toc\" style=\"margin-left: 40px;\"><a href=\"#6.1%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E6%A6%82%E8%BF%B0\" target=\"_blank\"  rel=\"nofollow\" >6.1 \u5783\u573e\u56de\u6536\u6982\u8ff0<\/a><\/p>\n<p id=\"6.1.1%20%E6%A6%82%E8%BF%B0-toc\" style=\"margin-left: 80px;\"><a href=\"#6.1.1%20%E6%A6%82%E8%BF%B0\" target=\"_blank\"  rel=\"nofollow\" >6.1.1 \u6982\u8ff0<\/a><\/p>\n<p id=\"6.1.2%20%E4%BB%80%E4%B9%88%E6%98%AF%E5%9E%83%E5%9C%BE%EF%BC%9F-toc\" style=\"margin-left: 80px;\"><a href=\"#6.1.2%20%E4%BB%80%E4%B9%88%E6%98%AF%E5%9E%83%E5%9C%BE%EF%BC%9F\" target=\"_blank\"  rel=\"nofollow\" >6.1.2 \u4ec0\u4e48\u662f\u5783\u573e\uff1f<\/a><\/p>\n<p id=\"6.1.3%20%E4%B8%BA%E4%BB%80%E4%B9%88%E9%9C%80%E8%A6%81%20GC%EF%BC%9F-toc\" style=\"margin-left: 80px;\"><a href=\"#6.1.3%20%E4%B8%BA%E4%BB%80%E4%B9%88%E9%9C%80%E8%A6%81%20GC%EF%BC%9F\" target=\"_blank\"  rel=\"nofollow\" >6.1.3 \u4e3a\u4ec0\u4e48\u9700\u8981 GC\uff1f<\/a><\/p>\n<p id=\"6.1.4%20%E6%97%A9%E6%9C%9F%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6-toc\" style=\"margin-left: 80px;\"><a href=\"#6.1.4%20%E6%97%A9%E6%9C%9F%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6\" target=\"_blank\"  rel=\"nofollow\" >6.1.4 \u65e9\u671f\u5783\u573e\u56de\u6536<\/a><\/p>\n<p id=\"6.1.5Java%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E6%9C%BA%E5%88%B6-toc\" style=\"margin-left: 80px;\"><a href=\"#6.1.5Java%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E6%9C%BA%E5%88%B6\" target=\"_blank\"  rel=\"nofollow\" >6.1.5Java \u5783\u573e\u56de\u6536\u673a\u5236<\/a><\/p>\n<p id=\"6.2%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%9B%B8%E5%85%B3%E7%AE%97%E6%B3%95-toc\" style=\"margin-left: 40px;\"><a href=\"#6.2%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%9B%B8%E5%85%B3%E7%AE%97%E6%B3%95\" target=\"_blank\"  rel=\"nofollow\" >6.2 \u5783\u573e\u56de\u6536\u76f8\u5173\u7b97\u6cd5<\/a><\/p>\n<p id=\"6.2.1%20%E5%9E%83%E5%9C%BE%E6%A0%87%E8%AE%B0%E9%98%B6%E6%AE%B5%E7%AE%97%E6%B3%95-toc\" style=\"margin-left: 80px;\"><a href=\"#6.2.1%20%E5%9E%83%E5%9C%BE%E6%A0%87%E8%AE%B0%E9%98%B6%E6%AE%B5%E7%AE%97%E6%B3%95\" target=\"_blank\"  rel=\"nofollow\" >6.2.1 \u5783\u573e\u6807\u8bb0\u9636\u6bb5\u7b97\u6cd5<\/a><\/p>\n<p id=\"6.2.2%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E9%98%B6%E6%AE%B5%E7%AE%97%E6%B3%95-toc\" style=\"margin-left: 80px;\"><a href=\"#6.2.2%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E9%98%B6%E6%AE%B5%E7%AE%97%E6%B3%95\" target=\"_blank\"  rel=\"nofollow\" >6.2.2 \u5783\u573e\u56de\u6536\u9636\u6bb5\u7b97\u6cd5<\/a><\/p>\n<p id=\"6.3%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%9B%B8%E5%85%B3%E6%A6%82%E5%BF%B5-toc\" style=\"margin-left: 40px;\"><a href=\"#6.3%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%9B%B8%E5%85%B3%E6%A6%82%E5%BF%B5\" target=\"_blank\"  rel=\"nofollow\" >6.3 \u5783\u573e\u56de\u6536\u76f8\u5173\u6982\u5ff5<\/a><\/p>\n<p id=\"6.3.1System.gc()%20%E7%9A%84%E7%90%86%E8%A7%A3-toc\" style=\"margin-left: 80px;\"><a href=\"#6.3.1System.gc%28%29%20%E7%9A%84%E7%90%86%E8%A7%A3\" target=\"_blank\"  rel=\"nofollow\" >6.3.1System.gc() \u7684\u7406\u89e3<\/a><\/p>\n<p id=\"6.3.2%20%E5%86%85%E5%AD%98%E6%BA%A2%E5%87%BA%E4%B8%8E%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F-toc\" style=\"margin-left: 80px;\"><a href=\"#6.3.2%20%E5%86%85%E5%AD%98%E6%BA%A2%E5%87%BA%E4%B8%8E%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F\" target=\"_blank\"  rel=\"nofollow\" >6.3.2 \u5185\u5b58\u6ea2\u51fa\u4e0e\u5185\u5b58\u6cc4\u6f0f<\/a><\/p>\n<p id=\"6.3.3Stop%20the%20World-toc\" style=\"margin-left: 80px;\"><a href=\"#6.3.3Stop%20the%20World\" target=\"_blank\"  rel=\"nofollow\" >6.3.3Stop the World<\/a><\/p>\n<p id=\"6.4%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8-toc\" style=\"margin-left: 40px;\"><a href=\"#6.4%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8\" target=\"_blank\"  rel=\"nofollow\" >6.4 \u5783\u573e\u56de\u6536\u5668<\/a><\/p>\n<p id=\"6.4.1%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8%E6%A6%82%E8%BF%B0-toc\" style=\"margin-left: 80px;\"><a href=\"#6.4.1%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8%E6%A6%82%E8%BF%B0\" target=\"_blank\"  rel=\"nofollow\" >6.4.1 \u5783\u573e\u56de\u6536\u5668\u6982\u8ff0<\/a><\/p>\n<p id=\"6.4.2%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8%E5%88%86%E7%B1%BB-toc\" style=\"margin-left: 80px;\"><a href=\"#6.4.2%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8%E5%88%86%E7%B1%BB\" target=\"_blank\"  rel=\"nofollow\" >6.4.2 \u5783\u573e\u56de\u6536\u5668\u5206\u7c7b<\/a><\/p>\n<p id=\"6.4.3GC%20%E6%80%A7%E8%83%BD%E6%8C%87%E6%A0%87-toc\" style=\"margin-left: 80px;\"><a href=\"#6.4.3GC%20%E6%80%A7%E8%83%BD%E6%8C%87%E6%A0%87\" target=\"_blank\"  rel=\"nofollow\" >6.4.3GC \u6027\u80fd\u6307\u6807<\/a><\/p>\n<p id=\"6.4.4HotSpot%20%E5%9E%83%E5%9C%BE%E6%94%B6%E9%9B%86%E5%99%A8-toc\" style=\"margin-left: 80px;\"><a href=\"#6.4.4HotSpot%20%E5%9E%83%E5%9C%BE%E6%94%B6%E9%9B%86%E5%99%A8\" target=\"_blank\"  rel=\"nofollow\" >6.4.4HotSpot \u5783\u573e\u6536\u96c6\u5668<\/a><\/p>\n<p id=\"6.%204.5CMS%20%E5%9B%9E%E6%94%B6%E5%99%A8-toc\" style=\"margin-left: 80px;\"><a href=\"#6.%204.5CMS%20%E5%9B%9E%E6%94%B6%E5%99%A8\" target=\"_blank\"  rel=\"nofollow\" >6. 4.5CMS \u56de\u6536\u5668<\/a><\/p>\n<p id=\"6.4.6G1(Garbage%20First)%E5%9B%9E%E6%94%B6%E5%99%A8-toc\" style=\"margin-left: 80px;\"><a href=\"#6.4.6G1%28Garbage%20First%29%E5%9B%9E%E6%94%B6%E5%99%A8\" target=\"_blank\"  rel=\"nofollow\" >6.4.6G1(Garbage First)\u56de\u6536\u5668<\/a><\/p>\n<p id=\"6.4.7%20%E6%9F%A5%E7%9C%8B%20JVM%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8%E8%AE%BE%E7%BD%AE%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8-toc\" style=\"margin-left: 80px;\"><a href=\"#6.4.7%20%E6%9F%A5%E7%9C%8B%20JVM%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8%E8%AE%BE%E7%BD%AE%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8\" target=\"_blank\"  rel=\"nofollow\" >6.4.7 \u67e5\u770b JVM \u5783\u573e\u56de\u6536\u5668\u8bbe\u7f6e\u5783\u573e\u56de\u6536\u5668<\/a><\/p>\n<hr id=\"hr-toc\" \/>\n<hr \/>\n<h1 id=\"%E4%B8%80%E3%80%81JVM%E6%A6%82%E8%BF%B0\">\u4e00\u3001JVM\u6982\u8ff0<\/h1>\n<h3 id=\"1%E3%80%811%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E5%AD%A6%E4%B9%A0JVM\">1\u30011\u4e3a\u4ec0\u4e48\u8981\u5b66\u4e60JVM<\/h3>\n<p>\u4e2d\u9ad8\u7a0b\u5e8f\u5458\u5fc5\u5907\u6280\u80fd\uff1a<\/p>\n<blockquote><p>\u9879\u76ee\u7ba1\u7406\u3001\u6027\u80fd\u8c03\u4f18<\/p><\/blockquote>\n<h3 id=\"1%E3%80%812%E8%99%9A%E6%8B%9F%E6%9C%BA\">1\u30012\u865a\u62df\u673a<\/h3>\n<ul>\n<li>\u865a\u62df\u673a\uff08Virtual Machine\uff09\uff0c\u865a\u62df\u8ba1\u7b97\u673a\u3002\u4ed6\u662f\u4e00\u6b3e\u8f6f\u4ef6\uff0c\u7528\u6765\u6267\u884c\u4e00\u7cfb\u5217\u865a\u62df\u8ba1\u7b97\u673a\u6307\u4ee4\u3002\u5927\u4f53\u4e0a\uff0c\u865a\u62df\u673a\u53ef\u4ee5\u5206\u4e3a\u7cfb\u7edf\u865a\u62df\u673a\u548c\u7a0b\u5e8f\u865a\u62df\u673a\u3002<\/li>\n<li>VMware\u5c5e\u4e8e\u7cfb\u7edf\u865a\u62df\u673a\uff0c\u5b8c\u5168\u5bf9\u7269\u7406\u8ba1\u7b97\u673a\u7684\u4eff\u771f\uff0c\u63d0\u4f9b\u4e00\u4e2a\u53ef\u8fd0\u884c\u5b8c\u6574\u64cd\u4f5c\u7cfb\u7edf\u7684\u5e73\u53f0\u3002\u7a0b\u5e8f\u865a\u62df\u673a\u7684\u5178\u578b\u4ee3\u8868\u662fjava\u865a\u62df\u673a\uff0c\u4e13\u95e8\u4e3a\u6267\u884c\u67d0\u4e2a\u8ba1\u7b97\u673a\u7a0b\u5e8f\u800c\u8bbe\u8ba1\u3002<br \/>\n\u5728java\u865a\u62df\u673a\u4e2d\u6267\u884c\u7684\u6307\u4ee4\u79f0\u4e3ajava\u5b57\u8282\u7801\u6307\u4ee4\u3002<\/li>\n<li>Java\u865a\u62df\u673a\u662f\u4e00\u79cd\u6267\u884cjava\u5b57\u8282\u7801\u6587\u4ef6\u7684\u865a\u62df\u673a\uff0c\u5b83\u62e5\u6709\u72ec\u7acb\u7684\u8fd0\u884c\u673a\u5236\u3002<\/li>\n<li>Java\u6280\u672f\u7684\u6838\u5fc3\u5c31\u662fJava\u865a\u62df\u673a\uff0c\u56e0\u4e3a\u6240\u6709\u7684java\u7a0b\u5e8f\u90fd\u8981\u5728java\u865a\u62df\u673a\u5185\u90e8\u8fd0\u884c\u3002<\/li>\n<\/ul>\n<h3 id=\"1%E3%80%813JVM%E4%BD%9C%E7%94%A8\">1\u30013JVM\u4f5c\u7528<\/h3>\n<p><span style=\"color: #0d0016;\">\u00a0 \u00a0 \u00a0 \u00a0Java\u865a\u62df\u673a\u8d1f\u8d23\u88c5\u8f7d\u5b57\u8282\u7801\u5230\u5176\u5185\u90e8\uff0c\u89e3\u91ca\/\u7f16\u8bd1\u4e3a\u5bf9\u5e94\u5e73\u53f0\u4e0a\u7684\u673a\u5668\u7801\u6307\u4ee4\u6267\u884c\uff0c\u6bcf\u4e00\u6761java\u6307\u4ee4\uff0cjava\u865a\u62df\u673a\u4e2d\u90fd\u6709\u8be6\u7ec6\u5b9a\u4e49\uff0c\u5982\u600e\u4e48\u53d6\u64cd\u4f5c\u6570\uff0c\u600e\u4e48\u5904\u7406\u64cd\u4f5c\u6570\uff0c\u5904\u7406\u7ed3\u679c\u653e\u5728\u54ea\u3002<\/span><\/p>\n<hr \/>\n<p>\u7279\u70b9\uff1a<\/p>\n<ol>\n<li>\u4e00\u6b21\u7f16\u8bd1\u5230\u5904\u8fd0\u884c\uff1b<\/li>\n<li>\u81ea\u52a8\u5185\u5b58\u7ba1\u7406\uff1b<\/li>\n<li>\u81ea\u52a8\u5783\u573e\u56de\u6536\u529f\u80fd\uff1b<\/li>\n<\/ol>\n<blockquote><p>\u00a0 \u00a0 \u00a0 \u00a0\u73b0\u5728\u7684JVM\u4e0d\u4ec5\u53ef\u4ee5\u6267\u884cjava\u5b57\u8282\u7801\u6587\u4ef6\uff0c\u8fd8\u53ef\u4ee5\u6267\u884c\u5176\u4ed6\u8bed\u8a00\u7f16\u8bd1\u540e\u7684\u5b57\u8282\u7801\u6587\u4ef6\uff0c\u662f\u4e00\u4e2a\u8de8\u8bed\u8a00\u5e73\u53f0\u3002<\/p><\/blockquote>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-05\/202307141358054e4e81ddf.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"711\" height=\"227\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-05\/202307141358054e4e81ddf.png\" alt=\"\" width=\"711\" height=\"227\" \/><\/noscript><\/p>\n<h3><\/h3>\n<h3 id=\"1%E3%80%814JVM%E6%95%B4%E4%BD%93%E7%BB%84%E6%88%90%E9%83%A8%E5%88%86%C2%A0\">1\u30014JVM\u6574\u4f53\u7ec4\u6210\u90e8\u5206<\/h3>\n<ol>\n<li>\u7c7b\u52a0\u8f7d\u5668\uff08ClassLoader\uff09<\/li>\n<li>\u8fd0\u884c\u65f6\u6570\u636e\u533a\uff08Runtime Data Area\uff09<\/li>\n<li>\u6267\u884c\u5f15\u64ce\uff08Execution Engine\uff09<\/li>\n<li>\u672c\u5730\u5e93\u63a5\u53e3\uff08Native Interface\uff09<\/li>\n<\/ol>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-06\/20230714135806acacdad0e.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"468\" height=\"305\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-06\/20230714135806acacdad0e.png\" alt=\"\" width=\"468\" height=\"305\" \/><\/noscript><\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-06\/202307141358064747b8b43.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"614\" height=\"428\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-06\/202307141358064747b8b43.png\" alt=\"\" width=\"614\" height=\"428\" \/><\/noscript><\/p>\n<blockquote><p>\u00a0 \u00a0 \u00a0 \u00a0\u00a0<span style=\"color: #000000;\">\u7a0b\u5e8f\u5728\u6267\u884c\u4e4b\u524d\u5148\u8981\u628a java \u4ee3\u7801\u8f6c\u6362\u6210\u5b57\u8282\u7801\uff08class \u6587\u4ef6\uff09\uff0cjvm \u9996\u5148\u9700\u8981\u628a\u5b57\u8282\u7801\u901a\u8fc7\u4e00\u5b9a\u7684\u65b9\u5f0f <strong>\u7c7b\u52a0\u8f7d\u5668\uff08ClassLoader\uff09 <\/strong><\/span><span style=\"color: #000000;\">\u628a\u6587\u4ef6\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u7684<strong>\u8fd0\u884c\u65f6\u6570\u636e\u533a\uff08Runtime Data Area\uff09 <\/strong><\/span><span style=\"color: #000000;\">\uff0c\u800c\u5b57\u8282\u7801\u6587\u4ef6\u662f jvm \u7684\u4e00\u5957\u6307<\/span><span style=\"color: #000000;\">\u4ee4\u96c6\u89c4\u8303\uff0c\u5e76\u4e0d\u80fd\u76f4\u63a5\u4ea4\u4e2a\u5e95\u5c42\u64cd\u4f5c\u7cfb\u7edf\u53bb\u6267\u884c\uff0c\u56e0\u6b64\u9700\u8981\u7279\u5b9a\u7684\u547d\u4ee4\u89e3\u6790\u5668 <strong>\u6267\u884c\u5f15\u64ce\uff08Execution Engine\uff09 <\/strong><\/span><span style=\"color: #000000;\">\u5c06\u5b57\u8282\u7801\u7ffb\u8bd1\u6210\u5e95\u5c42\u7cfb\u7edf\u6307\u4ee4\u518d\u4ea4\u7531CPU \u53bb\u6267\u884c\uff0c\u800c\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u9700\u8981\u8c03\u7528\u5176\u4ed6\u8bed\u8a00\u7684\u63a5\u53e3 <strong>\u672c\u5730\u5e93\u63a5\u53e3\uff08Native <\/strong><\/span><\/p>\n<div><span style=\"color: #000000;\"><strong>Interface\uff09 <\/strong><\/span> <span style=\"color: #000000;\">\u6765\u5b9e\u73b0\u6574\u4e2a\u7a0b\u5e8f\u7684\u529f\u80fd\uff0c\u8fd9\u5c31\u662f\u8fd9 4 \u4e2a\u4e3b\u8981\u7ec4\u6210\u90e8\u5206\u7684\u804c\u8d23\u4e0e\u529f\u80fd\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u800c\u6211\u4eec\u901a\u5e38\u6240\u8bf4\u7684 JVM \u7ec4\u6210\u6307\u7684\u662f<\/span> <span style=\"color: #000000;\"><strong>\u8fd0\u884c\u65f6\u6570\u636e\u533a\uff08Runtime Data\u00a0<\/strong><\/span> <span style=\"color: #000000;\"><strong>Area\uff09<\/strong><\/span> <span style=\"color: #000000;\">\uff0c\u56e0\u4e3a\u901a\u5e38\u9700\u8981\u7a0b\u5e8f\u5458\u8c03\u8bd5\u5206\u6790\u7684\u533a\u57df\u5c31\u662f\u201c\u8fd0\u884c\u65f6\u6570\u636e\u533a\u201d\uff0c\u6216\u8005\u66f4\u5177\u4f53\u7684\u6765\u8bf4\u5c31\u662f\u201c\u8fd0\u884c\u65f6\u6570\u636e\u533a\u201d\u91cc\u9762\u7684 Heap\uff08\u5806\uff09\u6a21\u5757\u3002<\/span><\/div>\n<\/blockquote>\n<h1 id=\"%E4%BA%8C%E3%80%81JVM%E7%BB%93%E6%9E%84--%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8\">\u4e8c\u3001JVM\u7ed3\u6784--\u7c7b\u52a0\u8f7d\u5668<\/h1>\n<h2 id=\"2%E3%80%811%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%AD%90%E7%B3%BB%E7%BB%9F\">2\u30011\u7c7b\u52a0\u8f7d\u5b50\u7cfb\u7edf<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-07\/202307141358070000a9990.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"899\" height=\"329\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-07\/202307141358070000a9990.png\" alt=\"\" width=\"899\" height=\"329\" \/><\/noscript><\/p>\n<p>\u7c7b\u52a0\u8f7d\u5b50\u7cfb\u7edf\u8d1f\u8d23\u4ece\u6587\u4ef6\u7cfb\u7edf\u6216\u8005\u7f51\u7edc\u4e2d\u52a0\u8f7dclass\u6587\u4ef6\u3002classLoader\u53ea\u8d1f\u8d23class\u6587\u4ef6\u7684\u52a0\u8f7d\uff0c\u81f3\u4e8e\u5b83\u662f\u5426\u53ef\u4ee5\u88d5\u5174\uff0c\u5219\u7531Execution Engine\u51b3\u5b9a\u3002<\/p>\n<p>\u52a0\u8f7d\u7684\u7c7b\u4fe1\u606f\u5b58\u653e\u4e8e\u4e00\u5757\u79f0\u4e3a\u65b9\u6cd5\u533a\u7684\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-07\/20230714135807fafa99334.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"502\" height=\"342\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-07\/20230714135807fafa99334.png\" alt=\"\" width=\"502\" height=\"342\" \/><\/noscript><\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 <span style=\"color: #494949;\">class file \u5b58\u5728\u4e8e\u786c\u76d8\u4e0a,\u53ef\u4ee5\u7406\u89e3\u4e3a\u8bbe\u8ba1\u5e08\u753b\u5728\u7eb8\u4e0a\u7684\u6a21\u677f,\u800c\u6700\u7ec8\u8fd9\u4e2a\u6a21\u677f\u5728\u6267\u884c\u7684\u65f6\u5019\u662f\u8981\u52a0\u8f7d JVM \u5f53\u4e2d\u6765,\u6839\u636e\u8fd9\u4e2a\u6a21\u677f\u5b9e\u4f8b\u5316\u51fa n \u4e2a\u5b9e\u4f8b.<br \/>\nclass file \u52a0\u8f7d\u5230 JVM \u4e2d,\u88ab\u79f0\u4e3a DNA \u5143\u6570\u636e\u6a21\u677f. \u6b64\u8fc7\u7a0b\u5c31\u8981\u6709\u4e00\u4e2a\u8fd0\u8f93\u5de5\u5177(\u7c7b\u52a0\u8f7d\u5668 Class Loader),\u626e\u6f14\u4e00\u4e2a\u5feb\u9012\u5458\u7684\u89d2\u8272<\/span><\/p>\n<h2 id=\"2%E3%80%812%E7%B1%BB%E5%8A%A0%E8%BD%BD%E8%BF%87%E7%A8%8B\">2\u30012\u7c7b\u52a0\u8f7d\u8fc7\u7a0b<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-08\/20230714135808b8b8db055.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"907\" height=\"244\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-08\/20230714135808b8b8db055.png\" alt=\"\" width=\"907\" height=\"244\" \/><\/noscript><\/p>\n<h3 id=\"2%E3%80%812%E3%80%811%E5%8A%A0%E8%BD%BD\">2\u30012\u30011\u52a0\u8f7d<\/h3>\n<ol>\n<li>\u00a0\u901a\u8fc7\u7c7b\u540d\uff08\u5730\u5740\uff09\u83b7\u53d6\u6b64\u7c7b\u7684\u4e8c\u8fdb\u5236\u5b57\u8282\u6d41\u3002<\/li>\n<li>\u5c06\u8fd9\u4e2a\u5b57\u8282\u6d41\u6240\u4ee3\u8868\u7684\u9759\u6001\u5b58\u50a8\u7ed3\u6784\u8f6c\u6362\u4e3a\u65b9\u6cd5\u533a\uff08\u5143\u7a7a\u95f4\uff09\u7684\u8fd0\u884c\u65f6\u7ed3\u6784\u3002<\/li>\n<li>\u5728\u5185\u5b58\u4e2d\u751f\u6210\u4e00\u4e2a\u4ee3\u8868\u8fd9\u4e2a\u7c7b\u7684java.lang.class\u5bf9\u8c61\uff0c\u4f5c\u4e3a\u8fd9\u4e2a\u7c7b\u7684\u5404\u79cd\u6570\u636e\u7684\u8bbf\u95ee\u5165\u53e3\u3002<\/li>\n<\/ol>\n<h3 id=\"2%E3%80%812%E3%80%812%E9%93%BE%E6%8E%A5\">2\u30012\u30012\u94fe\u63a5<\/h3>\n<ol>\n<li>\u9a8c\u8bc1\uff1a\u68c0\u9a8c\u88ab\u52a0\u8f7d\u7684\u7c7b\u662f\u5426\u6709\u6b63\u786e\u7684\u5185\u90e8\u7ed3\u6784\uff0c\u5e76\u548c\u5176\u4ed6\u7c7b\u534f\u8c03\u4e00\u81f4\uff1b<br \/>\n<span style=\"color: #000000;\"><strong>\u9a8c\u8bc1\u6587\u4ef6\u683c\u5f0f\u662f\u5426\u4e00\u81f4<\/strong><\/span><span style=\"color: #000000;\">: class \u6587\u4ef6\u5728\u6587\u4ef6\u5f00\u5934\u6709\u7279\u5b9a\u7684\u6587\u4ef6\u6807\u8bc6(\u5b57\u8282\u7801\u6587\u4ef6\u90fd\u4ee5 <\/span><span style=\"color: #ff0000;\"><strong>CA FE BA BE \u6807\u8bc6\u5f00\u5934<\/strong><\/span><span style=\"color: #000000;\">);\u4e3b,\u6b21\u7248\u672c\u53f7\u662f\u5426\u5728\u5f53\u524d java \u865a\u62df\u673a\u63a5\u6536\u8303\u56f4\u5185. <\/span><br \/>\n<span style=\"color: #000000;\"><strong>\u5143\u6570\u636e\u9a8c\u8bc1:<\/strong><\/span><span style=\"color: #000000;\">\u5bf9\u5b57\u8282\u7801\u63cf\u8ff0\u7684\u4fe1\u606f\u8fdb\u884c\u8bed\u4e49\u5206\u6790,\u4ee5\u4fdd\u8bc1\u5176\u63cf\u8ff0\u7684\u4fe1\u606f\u7b26\u5408java \u8bed\u8a00\u89c4\u8303\u7684\u8981\u6c42,\u4f8b\u5982\u8fd9\u4e2a\u7c7b\u662f\u5426\u6709\u7236\u7c7b;\u662f\u5426\u7ee7\u627f\u6d4f\u89c8\u4e0d\u5141\u8bb8\u88ab\u7ee7\u627f\u7684\u7c7b(final \u4fee\u9970\u7684\u7c7b)..... <\/span><\/li>\n<li><span style=\"color: #000000;\">\u51c6\u5907\uff1a\u51c6\u5907\u9636\u6bb5\u5219\u8d1f\u8d23\u4e3a\u7c7b\u7684<\/span><span style=\"color: #000000;\"><strong>\u9759\u6001\u5c5e\u6027<\/strong><\/span><span style=\"color: #000000;\">\u5206\u914d\u5185\u5b58\uff0c\u5e76\u8bbe\u7f6e<\/span><span style=\"color: #000000;\"><strong>\u9ed8\u8ba4\u521d\u59cb\u503c<\/strong><\/span><span style=\"color: #000000;\">\uff1b<br \/>\n<\/span><span style=\"color: #000000;\"><strong>\u4e0d\u5305\u542b\u7528 final \u4fee\u9970\u7684 static \u5e38\u91cf,\u5728\u7f16\u8bd1\u65f6\u8fdb\u884c\u521d\u59cb\u5316.<br \/>\n<\/strong>\u4f8b\u5982: public static int value = 123\uff1bvalue \u5728\u51c6\u5907\u9636\u6bb5\u540e\u7684\u521d\u59cb\u503c\u662f 0,\u800c\u4e0d\u662f 123. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u89e3\u6790\uff1a\u5c06\u7c7b\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u4e2d\u7684\u7b26\u53f7\u5f15\u7528\u66ff\u6362\u6210\u76f4\u63a5\u5f15\u7528\uff08\u7b26\u53f7\u5f15\u7528\u662f Class \u6587\u4ef6\u7684\u903b\u8f91\u7b26\u53f7\uff0c\u76f4\u63a5\u5f15\u7528\u6307\u5411\u7684\u65b9\u6cd5\u533a\u4e2d\u67d0\u4e00\u4e2a\u5730\u5740\uff09<\/span><\/li>\n<\/ol>\n<h3 id=\"2%E3%80%812%E3%80%813%E5%88%9D%E5%A7%8B%E5%8C%96\">2\u30012\u30013\u521d\u59cb\u5316<\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u521d\u59cb\u5316\uff0c\u4e3a\u7c7b\u7684\u9759\u6001\u53d8\u91cf\u8d4b\u4e88\u6b63\u786e\u7684\u521d\u59cb\u503c\uff0cJVM \u8d1f\u8d23\u5bf9\u7c7b\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u4e3b\u8981\u5bf9\u7c7b\u53d8\u91cf\u8fdb\u884c\u521d\u59cb\u5316\u3002\u521d\u59cb\u5316\u9636\u6bb5\u5c31\u662f\u6267\u884c\u5e95\u5c42\u7c7b\u6784\u9020\u5668\u65b9\u6cd5&lt;clinit&gt;()\u7684\u8fc7\u7a0b\u3002\u6b64\u65b9\u6cd5\u4e0d\u9700\u8981\u5b9a\u4e49\uff0c\u662f javac \u7f16\u8bd1\u5668\u81ea\u52a8\u6536\u96c6\u7c7b\u4e2d\u7684\u6240\u6709\u7c7b\u53d8\u91cf\u7684\u8d4b\u503c\u52a8\u4f5c\u548c\u9759\u6001\u4ee3\u7801\u5757\u4e2d\u7684\u8bed\u53e5\u5408\u5e76\u800c\u6765\u7684\u3002<\/span><\/div>\n<div><\/div>\n<div><strong><span style=\"color: #000000;\">\u7c7b\u4ec0\u4e48\u65f6\u5019\u521d\u59cb\u5316\uff1a<\/span><\/strong><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0JVM\u89c4\u5b9a\uff1a\u6bcf\u4e2a\u7c7b\u6216\u8005\u63a5\u53e3\u88ab\u9996\u6b21\u4e3b\u52a8\u4f7f\u7528\u65f6\u624d\u5bf9\u5176\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/span><\/div>\n<ul>\n<li><span style=\"color: #000000;\">\u901a\u8fc7 new \u5173\u952e\u5b57\u521b\u5efa\u5bf9\u8c61 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u8bbf\u95ee\u7c7b\u7684\u9759\u6001\u53d8\u91cf,\u5305\u62ec\u8bfb\u53d6\u548c\u66f4\u65b0 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u8bbf\u95ee\u7c7b\u7684\u9759\u6001\u65b9\u6cd5 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5bf9\u67d0\u4e2a\u7c7b\u8fdb\u884c\u53cd\u5c04\u64cd\u4f5c <\/span><\/li>\n<li><span style=\"color: #000000;\">\u521d\u59cb\u5316\u5b50\u7c7b\u4f1a\u5bfc\u81f4\u7236\u7c7b\u7684\u7684\u521d\u59cb\u5316 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u6267\u884c\u8be5\u7c7b\u7684 main \u51fd\u6570<\/span><\/li>\n<\/ul>\n<p>\u9664\u4e86\u4ee5\u4e0a\u51e0\u79cd\u4e3b\u52a8\u4f7f\u7528\uff0c\u4ee5\u4e0b\u60c5\u51b5\u88ab\u52a8\u4f7f\u7528\uff0c\u4e0d\u4f1a\u52a0\u8f7d\u7c7b\uff1a<\/p>\n<ol>\n<li><span style=\"color: #000000;\">\u5f15\u7528\u8be5\u7c7b\u7684\u9759\u6001\u5e38\u91cf,\u6ce8\u610f\u662f\u5e38\u91cf,\u4e0d\u4f1a\u5bfc\u81f4\u521d\u59cb\u5316,\u4f46\u662f\u4e5f\u6709\u610f\u5916,\u8fd9\u91cc\u7684\u5e38\u91cf\u662f\u6307\u5df2\u7ecf\u6307\u5b9a\u5b57\u9762\u91cf\u7684\u5e38\u91cf,\u5bf9\u4e8e\u90a3\u4e9b\u9700\u8981\u4e00\u4e9b\u8ba1\u7b97\u624d\u80fd\u5f97\u51fa\u7ed3\u679c\u7684\u5e38\u91cf\u5c31\u4f1a\u5bfc\u81f4\u7c7b\u52a0\u8f7d,\u6bd4\u5982: <\/span><br \/>\n<span style=\"color: #000000;\">public final static int NUMBER = 5 ; \/\/\u4e0d\u4f1a\u5bfc\u81f4\u7c7b\u521d\u59cb\u5316,\u88ab\u52a8\u4f7f\u7528 <\/span><br \/>\n<span style=\"color: #000000;\">public final static int RANDOM = new Random().nextInt() ; \/\/\u4f1a\u5bfc\u81f4\u7c7b\u52a0\u8f7d <\/span><\/li>\n<li><span style=\"color: #000000;\">\u6784\u9020\u67d0\u4e2a\u7c7b\u7684\u6570\u7ec4\u65f6\u4e0d\u4f1a\u5bfc\u81f4\u8be5\u7c7b\u7684\u521d\u59cb\u5316,\u6bd4\u5982: <\/span><br \/>\n<span style=\"color: #000000;\">Student[] students = new Student[10] ;<\/span><\/li>\n<\/ol>\n<p><strong>\u7c7b\u7684\u521d\u59cb\u5316\u987a\u5e8f<\/strong><\/p>\n<p>\u5bf9static\u4fee\u9970\u7684\u53d8\u91cf\u6216\u8bed\u53e5\u5757\u8fdb\u884c\u8d4b\u503c<br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5982\u679c\u540c\u65f6\u5305\u542b\u591a\u4e2a\u9759\u6001\u53d8\u91cf\u548c\u9759\u6001\u4ee3\u7801\u5757\uff0c\u5219\u6309\u7167\u81ea\u4e0a\u800c\u4e0b\u7684\u987a\u5e8f\u4f9d\u6b21\u6267\u884c\u3002<br \/>\n\u5982\u679c\u521d\u59cb\u5316\u4e00\u4e2a\u7c7b\u7684\u65f6\u5019\uff0c\u5176\u7236\u7c7b\u5c1a\u672a\u521d\u59cb\u5316\uff0c\u5219\u4f18\u5148\u521d\u59cb\u5316\u5176\u7236\u7c7b\u3002<br \/>\n<strong>\u00a0 \u00a0\u987a\u5e8f\u662f\uff1a\u7236\u7c7b static \u2013&gt; \u5b50\u7c7b static<\/strong><\/span><\/p>\n<pre><code class=\"language-java\">public class ClassInit{\n    static{\n        num = 20;\n    }\n    static int num = 10;\n    public static void main (String[] args) {\n        \/\/num\u4ece\u51c6\u5907\u5230\u521d\u59cb\u5316\u503c\u53d8\u5316\u8fc7\u7a0b num=0 -&gt; num=20 -&gt; num=10\n        System.out.println(num);\/\/10\n    }\n}\n\n\npublic class ClassInit{\n    static int num = 10;\n    static{\n        num = 20;\n    }\n    public static void main (String[] args) {\n        \/\/num\u4ece\u51c6\u5907\u5230\u521d\u59cb\u5316\u503c\u53d8\u5316\u8fc7\u7a0b num=0 -&gt; num=10 -&gt; num=20\n        System.out.println(num);\/\/20\n    }\n}\n\n\n<\/code><\/pre>\n<h2 id=\"2%E3%80%813%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%E5%88%86%E7%B1%BB\">2\u30013\u7c7b\u52a0\u8f7d\u5668\u5206\u7c7b<\/h2>\n<p>\u7ad9\u5728JVM\u7684\u89d2\u5ea6\u770b\uff0c\u7c7b\u52a0\u8f7d\u5668\u53ef\u4ee5\u5206\u4e3a\u4e24\u79cd\uff1a<\/p>\n<ul>\n<li><span style=\"color: #000000;\">\u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668(\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668 Bootstrap ClassLoader). <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5176\u4ed6\u6240\u6709\u7c7b\u52a0\u8f7d\u5668,\u8fd9\u4e9b\u7c7b\u52a0\u8f7d\u5668\u7531 java \u8bed\u8a00\u5b9e\u73b0,\u72ec\u7acb\u5b58\u5728\u4e8e\u865a\u62df\u673a\u5916\u90e8,\u5e76 \u4e14\u5168\u90e8\u7ee7\u627f\u81ea\u62bd\u8c61\u7c7b java.lang.ClassLoader. <\/span><\/li>\n<\/ul>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u7ad9\u5728 java \u5f00\u53d1\u4eba\u5458\u7684\u89d2\u5ea6\u6765\u770b,\u7c7b\u52a0\u8f7d\u5668\u5c31\u5e94\u5f53\u5212\u5206\u5f97\u66f4\u7ec6\u81f4\u4e00\u4e9b.\u81ea JDK1.2 \u4ee5\u6765 java \u4e00\u76f4\u4fdd\u6301\u8005\u4e09\u5c42\u7c7b\u52a0\u8f7d\u5668<\/span><\/div>\n<div><\/div>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-08\/2023071413580837373d818.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"532\" height=\"268\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-08\/2023071413580837373d818.png\" alt=\"\" width=\"532\" height=\"268\" \/><\/noscript><\/p>\n<\/div>\n<h3 id=\"2.3.1%20%E5%BC%95%E5%AF%BC%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8(%E5%90%AF%E5%8A%A8%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%20BootStrap%20ClassLoader)\"><span style=\"color: #000000;\"><strong>2.3.1 \u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668(\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668 BootStrap ClassLoader) <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u8fd9\u4e2a\u7c7b\u52a0\u8f7d\u5668\u4f7f\u7528 C\/C++\u8bed\u8a00\u5b9e\u73b0,\u5d4c\u5957\u5728 JVM \u5185\u90e8.\u5b83\u7528\u6765\u52a0\u8f7d java \u6838\u5fc3\u7c7b\u5e93.\u5e76\u4e0d\u7ee7\u627f\u4e8e java.lang.ClassLoader \u6ca1\u6709\u7236\u52a0\u8f7d\u5668. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u8d1f\u8d23\u52a0\u8f7d\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\u548c\u5e94\u7528\u7c7b\u52a0\u8f7d\u5668,\u5e76\u4e3a\u4ed6\u4eec\u6307\u5b9a\u7236\u7c7b\u52a0\u8f7d\u5668. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u51fa\u4e8e\u5b89\u5168\u8003\u8651,\u5f15\u7528\u7c7b\u52a0\u8f7d\u5668\u53ea\u52a0\u8f7d\u5b58\u653e\u5728&lt;JAVA_HOME&gt;\\lib \u76ee\u5f55,\u6216\u8005\u88ab-Xbootclasspath \u53c2\u6570\u9501\u6307\u5b9a\u7684\u8def\u5f84\u4e2d\u5b58\u50a8\u653e\u7684\u7c7b.<\/span><\/div>\n<div><\/div>\n<div>\n<h3 id=\"2.3.2%20%E6%89%A9%E5%B1%95%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8(Extension%20ClassLoader)\"><span style=\"color: #000000;\"><strong>2.3.2 \u6269\u5c55\u7c7b\u52a0\u8f7d\u5668(Extension ClassLoader) <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0Java \u8bed\u8a00\u7f16\u5199\u7684,\u7531 sun.misc.Launcher$ExtClassLoader \u5b9e\u73b0. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u6d3e\u751f\u4e8e ClassLoader \u7c7b. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4ece java.ext.dirs \u7cfb\u7edf\u5c5e\u6027\u6240\u6307\u5b9a\u7684\u76ee\u5f55\u4e2d\u52a0\u8f7d\u7c7b\u5e93,\u6216\u4ece JDK \u7cfb\u7edf\u5b89\u88c5\u76ee\u5f55\u7684jre\/lib\/ext \u5b50\u76ee\u5f55(\u6269\u5c55\u76ee\u5f55)\u4e0b\u52a0\u8f7d\u7c7b\u5e93.\u5982\u679c\u7528\u6237\u521b\u5efa\u7684 jar \u653e\u5728\u6b64\u76ee\u5f55\u4e0b,\u4e5f\u4f1a\u81ea\u52a8\u7531\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d<\/span><\/div>\n<\/div>\n<div><\/div>\n<div>\n<h3 id=\"2.3.3%20%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8(%E7%B3%BB%E7%BB%9F%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%20Application%20ClassLoader)\"><span style=\"color: #000000;\"><strong>2.3.3 \u5e94\u7528\u7a0b\u5e8f\u7c7b\u52a0\u8f7d\u5668(\u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668 Application ClassLoader) <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0Java \u8bed\u8a00\u7f16\u5199\u7684,\u7531 sun.misc.Launcher$AppClassLoader \u5b9e\u73b0. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u6d3e\u751f\u4e8e ClassLoader \u7c7b. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u52a0\u8f7d\u6211\u4eec\u81ea\u5df1\u5b9a\u4e49\u7684\u7c7b,\u7528\u4e8e\u52a0\u8f7d\u7528\u6237\u7c7b\u8def\u5f84(classpath)\u4e0a\u6240\u6709\u7684\u7c7b. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u8be5\u7c7b\u52a0\u8f7d\u5668\u662f\u7a0b\u5e8f\u4e2d\u9ed8\u8ba4\u7684\u7c7b\u52a0\u8f7d\u5668. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0ClassLoader \u7c7b \uff0c \u5b83 \u662f \u4e00 \u4e2a \u62bd \u8c61 \u7c7b \uff0c \u5176 \u540e \u6240 \u6709 \u7684 \u7c7b \u52a0 \u8f7d \u5668 \u90fd \u7ee7 \u627f \u81ea ClassLoader\uff08\u4e0d\u5305\u62ec\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\uff09<\/span><\/div>\n<\/div>\n<div><\/div>\n<div>\n<h2 id=\"2.4%20%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE%E6%9C%BA%E5%88%B6\"><span style=\"color: #000000;\"><strong>2.4 \u53cc\u4eb2\u59d4\u6d3e\u673a\u5236 <\/strong><\/span><\/h2>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0Java \u865a\u62df\u673a\u5bf9 class \u6587\u4ef6\u91c7\u7528\u7684\u662f\u6309\u9700\u52a0\u8f7d\u7684\u65b9\u5f0f,\u4e5f\u5c31\u662f\u8bf4\u5f53\u9700\u8981\u8be5\u7c7b\u65f6\u624d\u4f1a\u5c06\u5b83\u7684 class \u6587\u4ef6\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u751f\u6210 class \u5bf9\u8c61.\u800c\u4e14\u52a0\u8f7d\u67d0\u4e2a\u7c7b\u7684 class \u6587\u4ef6\u65f6,Java \u865a\u62df\u673a\u91c7\u7528\u7684\u662f\u53cc\u4eb2\u59d4\u6d3e\u6a21\u5f0f,\u5373\u628a\u8bf7\u6c42\u4ea4\u7531\u7236\u7c7b\u5904\u7406,\u5b83\u662f\u4e00\u79cd\u4efb\u52a1\u59d4\u6d3e\u6a21\u5f0f<\/span><\/div>\n<\/div>\n<div><\/div>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-08\/202307141358084c4c1b2fb.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"558\" height=\"323\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-08\/202307141358084c4c1b2fb.png\" alt=\"\" width=\"558\" height=\"323\" \/><\/noscript><\/p>\n<\/div>\n<p><span style=\"color: #000000;\">\u5de5\u4f5c\u539f\u7406: <\/span><\/p>\n<ol>\n<li><span style=\"color: #000000;\">\u5982\u679c\u4e00\u4e2a\u7c7b\u52a0\u8f7d\u5668\u6536\u5230\u4e86\u7c7b\u52a0\u8f7d\u8bf7\u6c42,\u5b83\u5e76\u4e0d\u4f1a\u81ea\u5df1\u5148\u53bb\u52a0\u8f7d,\u800c\u662f\u628a\u8fd9\u4e2a\u8bf7 <\/span><span style=\"color: #000000;\">\u6c42\u59d4\u6258\u7ed9\u7236\u7c7b\u7684\u52a0\u8f7d\u5668\u53bb\u6267\u884c. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5982\u679c\u7236\u7c7b\u52a0\u8f7d\u5668\u8fd8\u5b58\u5728\u5176\u7236\u7c7b\u52a0\u8f7d\u5668,\u5219\u8fdb\u4e00\u6b65\u5411\u4e0a\u59d4\u6258,\u4f9d\u6b21\u9012\u5f52,\u8bf7\u6c42\u6700\u7ec8 <\/span><span style=\"color: #000000;\">\u5c06\u5230\u8fbe\u9876\u5c42\u7684\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5982\u679c\u7236\u7c7b\u52a0\u8f7d\u5668\u53ef\u4ee5\u5b8c\u6210\u7c7b\u7684\u52a0\u8f7d\u4efb\u52a1,\u5c31\u6210\u529f\u8fd4\u56de,\u5018\u82e5\u7236\u7c7b\u52a0\u8f7d\u5668\u65e0\u6cd5\u5b8c <\/span><span style=\"color: #000000;\">\u6210\u52a0\u8f7d\u4efb\u52a1,\u5b50\u52a0\u8f7d\u5668\u624d\u4f1a\u5c1d\u8bd5\u81ea\u5df1\u53bb\u52a0\u8f7d,\u8fd9\u5c31\u662f\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5982\u679c\u5747\u52a0\u8f7d\u5931\u8d25\uff0c\u5c31\u4f1a\u629b\u51fa ClassNotFoundException \u5f02\u5e38\u3002<\/span><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-09\/20230714135809d4d44cd8a.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"579\" height=\"205\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-09\/20230714135809d4d44cd8a.png\" alt=\"\" width=\"579\" height=\"205\" \/><\/noscript><\/li>\n<\/ol>\n<p><strong>\u00a0\u53cc\u4eb2\u59d4\u6d3e\u4f18\u70b9\uff1a<\/strong><\/p>\n<ol>\n<li><span style=\"color: #000000;\">\u5b89\u5168\uff0c\u53ef\u907f\u514d\u7528\u6237\u81ea\u5df1\u7f16\u5199\u7684\u7c7b\u66ff\u6362 Java \u7684\u6838\u5fc3\u7c7b\uff0c\u5982 java.lang.String. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u907f\u514d\u7c7b\u91cd\u590d\u52a0\u8f7d,\u5f53\u7236\u4eb2\u5df2\u7ecf\u52a0\u8f7d\u4e86\u8be5\u7c7b\u65f6\uff0c\u5c31\u6ca1\u6709\u5fc5\u8981\u5b50 ClassLoader \u518d\u52a0\u8f7d\u4e00\u6b21<\/span><\/li>\n<\/ol>\n<h2 id=\"2.5%20%E5%A6%82%E4%BD%95%E6%89%93%E7%A0%B4%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE%E6%9C%BA%E5%88%B6\"><span style=\"color: #000000;\"><strong>2.5 \u5982\u4f55\u6253\u7834\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236<\/strong><\/span><\/h2>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0Java \u865a\u62df\u673a\u7684\u7c7b\u52a0\u8f7d\u5668\u672c\u8eab\u53ef\u4ee5\u6ee1\u8db3\u52a0\u8f7d\u7684\u8981\u6c42\uff0c\u4f46\u662f\u4e5f\u5141\u8bb8\u5f00\u53d1\u8005\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5728 ClassLoader \u7c7b\u4e2d\u6d89\u53ca\u7c7b\u52a0\u8f7d\u7684\u65b9\u6cd5\u6709\u4e24\u4e2a,loadClass(String name), findClass(String name),\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u5e76\u6ca1\u6709\u88ab final \u4fee\u9970,\u4e5f\u5c31\u8868\u793a\u5176\u4ed6\u5b50\u7c7b\u53ef\u4ee5\u91cd\u5199. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u91cd\u5199 loadClass \u65b9\u6cd5(\u662f\u5b9e\u73b0\u53cc\u4eb2\u59d4\u6d3e\u903b\u8f91\u7684\u5730\u65b9,\u4fee\u6539\u4ed6\u4f1a\u7834\u574f\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236, \u4e0d\u63a8\u8350) <\/span><\/div>\n<div><span style=\"color: #000000;\">\u91cd\u5199 findClass \u65b9\u6cd5 (\u63a8\u8350) <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u91cd\u5199\u65b9\u6cd5\u6253\u7834\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236, \u518d\u4f8b\u5982 tomcat \u7b49\u90fd\u6709\u81ea\u5df1\u5b9a\u4e49\u7684\u7c7b\u52a0\u8f7d\u5668. <\/span><\/div>\n<h1 id=\"%E4%B8%89%E3%80%81JVM%E8%BF%90%E8%A1%8C%E6%97%B6%E6%95%B0%E6%8D%AE%E5%8C%BA\">\u4e09\u3001JVM\u8fd0\u884c\u65f6\u6570\u636e\u533a<\/h1>\n<h2 id=\"3%E3%80%811%E8%BF%90%E8%A1%8C%E6%97%B6%E6%95%B0%E6%8D%AE%E5%8C%BA%E7%BB%84%E6%88%90%E6%A6%82%E8%BF%B0\">3\u30011\u8fd0\u884c\u65f6\u6570\u636e\u533a\u7ec4\u6210\u6982\u8ff0<\/h2>\n<div><span style=\"color: #000000;\">JVM \u7684\u8fd0\u884c\u65f6\u6570\u636e\u533a\uff0c\u4e0d\u540c\u865a\u62df\u673a\u5b9e\u73b0\u53ef\u80fd\u7565\u5fae\u6709\u6240\u4e0d\u540c\uff0c\u4f46\u90fd\u4f1a\u9075\u4ece Java \u865a\u62df\u673a\u89c4\u8303\uff0c<\/span><\/div>\n<div><span style=\"color: #000000;\">Java 8 \u865a\u62df\u673a\u89c4\u8303\u89c4\u5b9a\uff0cJava \u865a\u62df\u673a\u6240\u7ba1\u7406\u7684\u5185\u5b58\u5c06\u4f1a\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\uff1a<\/span><\/div>\n<div><\/div>\n<div>\n<h3 id=\"3.1.1%20%E7%A8%8B%E5%BA%8F%E8%AE%A1%E6%95%B0%E5%99%A8%EF%BC%88Program%20Counter%20Register%EF%BC%89\"><span style=\"color: #000000;\"><strong>3.1.1 \u7a0b\u5e8f\u8ba1\u6570\u5668\uff08Program Counter Register\uff09 <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u7a0b\u5e8f\u8ba1\u6570\u5668\uff08Program Counter Register\uff09\u662f\u4e00\u5757\u8f83\u5c0f\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u5b83\u53ef\u4ee5\u770b\u4f5c\u662f\u5f53\u524d\u7ebf\u7a0b\u6240\u6267\u884c\u7684\u5b57\u8282\u7801\u7684\u884c\u53f7\u6307\u793a\u5668\u3002 <\/span><\/div>\n<div><\/div>\n<h3 id=\"3.1.2Java%20%E8%99%9A%E6%8B%9F%E6%9C%BA%E6%A0%88%EF%BC%88Java%20Virtual%20Machine%20Stacks%EF%BC%89\"><span style=\"color: #000000;\"><strong>3.1.2Java \u865a\u62df\u673a\u6808\uff08Java Virtual Machine Stacks\uff09 <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u63cf\u8ff0\u7684\u662f Java \u65b9\u6cd5\u6267\u884c\u7684\u5185\u5b58\u6a21\u578b\uff0c\u6bcf\u4e2a\u65b9\u6cd5\u5728\u6267\u884c\u7684\u540c\u65f6\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u7ebf\u5e27\uff08Stack Frame\uff09\u7528\u4e8e\u5b58\u50a8\u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6570\u6808\u3001\u52a8\u6001\u94fe\u63a5\u3001\u65b9\u6cd5\u51fa\u53e3\u7b49\u4fe1\u606f\uff0c\u6bcf\u4e2a\u65b9\u6cd5\u4ece\u8c03\u7528\u76f4\u81f3\u6267\u884c\u5b8c\u6210\u7684\u8fc7\u7a0b\uff0c\u90fd\u5bf9\u5e94\u7740\u4e00\u4e2a\u7ebf\u5e27\u5728\u865a\u62df\u673a\u6808\u4e2d\u5165\u6808\u5230\u51fa\u6808\u7684\u8fc7\u7a0b\u3002 <\/span><\/div>\n<div><\/div>\n<h3 id=\"3.1.3%20%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95%E6%A0%88%EF%BC%88Native%20Method%20Stack%EF%BC%89\"><span style=\"color: #000000;\"><strong>3.1.3 \u672c\u5730\u65b9\u6cd5\u6808\uff08Native Method Stack\uff09 <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4e0e\u865a\u62df\u673a\u6808\u7684\u4f5c\u7528\u662f\u4e00\u6837\u7684\uff0c\u53ea\u4e0d\u8fc7\u865a\u62df\u673a\u6808\u662f\u670d\u52a1 Java \u65b9\u6cd5\u7684\uff0c\u800c\u672c\u5730\u65b9\u6cd5\u6808\u662f\u4e3a\u865a\u62df\u673a\u8c03\u7528 Native \u65b9\u6cd5\u670d\u52a1\u7684\u3002 <\/span><\/div>\n<div><\/div>\n<h3 id=\"3.1.4Java%20%E5%A0%86%EF%BC%88Java%20Heap%EF%BC%89\"><span style=\"color: #000000;\"><strong>3.1.4Java \u5806\uff08Java Heap\uff09 <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u662f Java \u865a\u62df\u673a\u4e2d\u5185\u5b58\u6700\u5927\u7684\u4e00\u5757\uff0c\u662f\u88ab\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u7684\uff0c\u5728\u865a\u62df\u673a\u542f\u52a8\u65f6\u5019\u521b <\/span><\/div>\n<div><span style=\"color: #000000;\">\u5efa\uff0cJava \u5806\u552f\u4e00\u7684\u76ee\u7684\u5c31\u662f\u5b58\u653e\u5bf9\u8c61\u5b9e\u4f8b\uff0c\u51e0\u4e4e\u6240\u6709\u7684\u5bf9\u8c61\u5b9e\u4f8b\u90fd\u5728\u8fd9\u91cc\u5206\u914d \u5185\u5b58. <\/span><\/div>\n<div><\/div>\n<h3 id=\"3.1.5%20%E6%96%B9%E6%B3%95%E5%8C%BA%EF%BC%88Methed%20Area%EF%BC%89\"><span style=\"color: #000000;\"><strong>3.1.5 \u65b9\u6cd5\u533a\uff08Methed Area\uff09 <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u7528\u4e8e\u5b58\u50a8\u5df2\u88ab\u865a\u62df\u673a\u52a0\u8f7d\u7684\u7c7b\u4fe1\u606f\u3001\u5e38\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u5373\u65f6\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u7b49\u6570\u636e\u3002\u65b9\u6cd5\u533a\u662f\u5f88\u91cd\u8981\u7684\u7cfb\u7edf\u8d44\u6e90,\u662f\u786c\u76d8\u548c CPU \u7684\u4e2d\u95f4\u6865\u6881,\u627f\u8f7d\u7740\u64cd\u4f5c\u7cfb\u7edf\u548c\u5e94\u7528\u7a0b\u5e8f\u7684\u5b9e\u65f6\u8fd0\u884c. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0JVM \u5185\u5b58\u5e03\u5c40\u89c4\u5b9a\u4e86 Java \u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u5185\u5b58\u7533\u8bf7,\u5206\u914d,\u7ba1\u7406\u7684\u7b56\u7565,\u4fdd\u8bc1\u4e86 JVM\u7684\u9ad8\u6548\u7a33\u5b9a\u8fd0\u884c.\u4e0d\u540c\u7684 JVM \u5bf9\u4e8e\u5185\u5b58\u7684\u5212\u5206\u65b9\u5f0f\u548c\u7ba1\u7406\u673a\u5236\u5b58\u5728\u7740\u90e8\u5206\u5dee\u5f02, \u4ee5\u6700\u4e3a\u6d41\u884c\u7684 HotSpot \u865a\u62df\u673a\u4e3a\u4f8b\uff1a<\/span><\/div>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-09\/20230714135809666638a72.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"479\" height=\"399\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-09\/20230714135809666638a72.png\" alt=\"\" width=\"479\" height=\"399\" \/><\/noscript><\/p>\n<\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0Java \u865a\u62df\u673a\u5b9a\u4e49\u4e86\u7a0b\u5e8f\u8fd0\u884c\u671f\u95f4\u4f1a\u4f7f\u7528\u5230\u7684\u8fd0\u884c\u6570\u636e\u533a,\u5176\u4e2d\u6709\u4e00\u4e9b\u4f1a\u968f\u7740\u865a\u62df\u673a\u542f\u52a8\u800c\u521b\u5efa,\u968f\u7740\u865a\u62df\u673a\u9000\u51fa\u800c\u9500\u6bc1.\u53e6\u5916\u4e00\u4e9b\u5219\u662f\u4e0e\u7ebf\u7a0b\u4e00\u4e00\u5bf9\u5e94\u7684. \u8fd9\u4e9b\u4e0e\u7ebf\u7a0b\u5bf9\u5e94\u7684\u533a\u57df\u4f1a\u968f\u7740\u7ebf\u7a0b\u5f00\u59cb\u548c\u7ed3\u675f\u800c\u521b\u5efa\u9500\u6bc1. <\/span><\/div>\n<div><\/div>\n<blockquote>\n<div><span style=\"color: #000000;\"><strong>\u00a0 \u00a0 \u00a0 \u00a0\u5982\u56fe:<\/strong><\/span> <span style=\"color: #000000;\">\u7ea2\u8272\u7684\u4e3a\u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab,\u7070\u8272\u7684\u4e3a\u5355\u4e2a\u7ebf\u7a0b\u79c1\u6709\u7684,\u5373<\/span> <span style=\"color: #000000;\"><strong>\u7ebf\u7a0b\u95f4\u5171\u4eab:\u5806,\u65b9\u6cd5\u533a. <\/strong><\/span> <span style=\"color: #000000;\"><strong>\u7ebf\u7a0b\u79c1\u6709:\u7a0b\u5e8f\u8ba1\u6570\u5668,\u6808,\u672c\u5730\u65b9\u6cd5\u6808.<\/strong><\/span><\/div>\n<\/blockquote>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-10\/202307141358105656ac2d5.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"581\" height=\"227\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-10\/202307141358105656ac2d5.png\" alt=\"\" width=\"581\" height=\"227\" \/><\/noscript><\/p>\n<h2 id=\"3.2.%E7%A8%8B%E5%BA%8F%E8%AE%A1%E6%95%B0%E5%99%A8%EF%BC%88Program%20Counter%20Register%EF%BC%89\"><span style=\"color: #000000;\"><strong>3.2.\u7a0b\u5e8f\u8ba1\u6570\u5668\uff08Program Counter Register\uff09<\/strong><\/span><\/h2>\n<div><span style=\"color: #000000;\">JVM \u4e2d\u7684\u7a0b\u5e8f\u8ba1\u6570\u5bc4\u5b58\u5668(Program Counter Register)\u8fd9\u91cc\u7ffb\u8bd1\u4e3a\u7a0b\u5e8f\u8ba1\u6570\u5668\u66f4\u5bb9\u6613\u7406\u89e3. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u7a0b\u5e8f\u8ba1\u6570\u5668\u7528\u6765\u5b58\u50a8\u4e0b\u4e00\u6761\u6307\u4ee4\u7684\u5730\u5740,\u4e5f\u5373\u5c06\u8981\u6267\u884c\u7684\u6307\u4ee4\u4ee3\u7801.\u7531\u6267\u884c\u5f15\u64ce\u8bfb\u53d6\u4e0b\u4e00\u6761\u6307\u4ee4. <\/span><\/div>\n<div><\/div>\n<\/div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-10\/202307141358104040ab9e3.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"630\" height=\"454\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-10\/202307141358104040ab9e3.png\" alt=\"\" width=\"630\" height=\"454\" \/><\/noscript><\/p>\n<blockquote>\n<ul>\n<li><span style=\"color: #000000;\">\u5b83\u662f\u4e00\u5757\u5f88\u5c0f\u7684\u5185\u5b58\u7a7a\u95f4,\u51e0\u4e4e\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1,\u4e5f\u662f\u8fd0\u884c\u901f\u5ea6\u6700\u5feb\u7684\u5b58\u50a8\u533a\u57df. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5728 JVM \u89c4\u8303\u4e2d,\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u5b83\u81ea\u5df1\u7684\u7a0b\u5e8f\u8ba1\u6570\u5668,\u662f\u7ebf\u7a0b\u79c1\u6709\u7684,\u751f\u547d\u5468\u671f\u4e0e\u7ebf\u7a0b\u751f\u547d\u5468\u671f\u4fdd\u6301\u4e00\u81f4. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u7a0b\u5e8f\u8ba1\u6570\u5668\u4f1a\u5b58\u50a8\u5f53\u524d\u7ebf\u7a0b\u6b63\u5728\u6267\u884c\u7684 Java \u65b9\u6cd5\u7684 JVM \u6307\u4ee4\u5730\u5740. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5b83\u662f\u7a0b\u5e8f\u63a7\u5236\u6d41\u7684\u6307\u793a\u5668,\u5206\u652f,\u5faa\u73af,\u8df3\u8f6c,\u5f02\u5e38\u5904\u7406,\u7ebf\u7a0b\u6062\u590d\u7b49\u57fa\u7840\u529f\u80fd\u90fd\u9700\u8981\u4f9d\u8d56\u8fd9\u4e2a\u8ba1\u6570\u5668\u6765\u5b8c\u6210.<\/span><\/li>\n<li><span style=\"color: #000000;\">\u5b83\u662f\u552f\u4e00\u4e00\u4e2a\u5728java\u865a\u62df\u673a\u89c4\u8303\u4e2d\u6ca1\u6709\u89c4\u5b9a\u4efb\u4f55OutOfMemoryError\u60c5\u51b5\u7684\u533a\u57df<\/span><\/li>\n<\/ul>\n<\/blockquote>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-11\/20230714135811d5d5bbfe8.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"473\" height=\"286\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-11\/20230714135811d5d5bbfe8.png\" alt=\"\" width=\"473\" height=\"286\" \/><\/noscript><\/p>\n<\/div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-11\/20230714135811b1b1ceaaa.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"382\" height=\"260\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-11\/20230714135811b1b1ceaaa.png\" alt=\"\" width=\"382\" height=\"260\" \/><\/noscript><\/p>\n<\/div>\n<h2 id=\"3.3.Java%20%E8%99%9A%E6%8B%9F%E6%9C%BA%E6%A0%88%EF%BC%88Java%20Virtual%20Machine%20Stacks%EF%BC%89\"><span style=\"color: #000000;\"><strong>3.3.Java \u865a\u62df\u673a\u6808\uff08Java Virtual Machine Stacks\uff09<\/strong><\/span><\/h2>\n<div><span style=\"color: #000000;\"><strong>\u6808\u7684\u57fa\u672c\u6982\u5ff5 <\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u6808\u662f\u8fd0\u884c\u65f6\u7684\u5355\u4f4d,\u5373\u6808\u89e3\u51b3\u7a0b\u5e8f\u7684\u8fd0\u884c\u95ee\u9898,\u5373\u7a0b\u5e8f\u5982\u4f55\u6267\u884c,\u6216\u8005\u8bf4\u5982\u4f55\u5904<\/span> <span style=\"color: #000000;\">\u7406\u6570\u636e. Java \u865a\u62df\u673a\u6808(Java Virtual Machine Stack),\u65e9\u671f\u4e5f\u53eb Java \u6808.\u6bcf\u4e2a\u7ebf\u7a0b\u5728\u521b\u5efa\u65f6\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u865a\u62df\u673a\u6808,\u5176\u5185\u90e8\u4fdd\u5b58\u4e00\u4e2a\u4e2a\u6808\u5e27,\u5bf9\u5e94\u7740\u4e00\u6b21\u65b9\u6cd5\u7684\u8c03\u7528.Java \u865a\u62df\u673a\u6808\u662f\u7ebf\u7a0b\u79c1\u6709\u7684.\u4e3b\u7ba1 Java \u7a0b\u5e8f\u7684\u8fd0\u884c,\u5b83\u4fdd\u5b58\u65b9\u6cd5\u7684\u5c40\u90e8\u53d8\u91cf(8\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b,\u5bf9\u8c61\u7684\u5f15\u7528\u5730\u5740),\u90e8\u5206\u7ed3\u679c,\u5e76\u53c2\u4e0e\u65b9\u6cd5\u7684\u8c03\u7528\u548c\u8fd4\u56de.<\/span><\/div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-11\/202307141358114c4c2961b.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"582\" height=\"322\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-11\/202307141358114c4c2961b.png\" alt=\"\" width=\"582\" height=\"322\" \/><\/noscript><\/p>\n<div><span style=\"color: #000000;\"><strong>\u6808\u7684\u7279\u70b9 <\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\">\u6808\u662f\u4e00\u79cd\u5feb\u901f\u6709\u6548\u7684\u5206\u914d\u5b58\u50a8\u65b9\u5f0f,\u8bbf\u95ee\u901f\u5ea6\u4ec5\u6b21\u4e8e\u7a0b\u5e8f\u8ba1\u6570\u5668. <\/span><\/div>\n<div><span style=\"color: #000000;\">JVM \u76f4\u63a5\u5bf9 java \u6808\u7684\u64cd\u4f5c\u53ea\u6709\u4e24\u4e2a:\u8c03\u7528\u65b9\u6cd5<\/span> <span style=\"color: #000000;\"><strong>\u5165\u6808<\/strong><\/span> <span style=\"color: #000000;\">.\u6267\u884c\u7ed3\u675f\u540e<\/span> <span style=\"color: #000000;\"><strong>\u51fa\u6808<\/strong><\/span> <span style=\"color: #000000;\">. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u5bf9\u4e8e\u6808\u6765\u8bf4\u4e0d\u5b58\u5728\u5783\u573e\u56de\u6536\u95ee\u9898.<\/span><\/div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-12\/20230714135812d2d2601ae.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"214\" height=\"346\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-12\/20230714135812d2d2601ae.png\" alt=\"\" width=\"214\" height=\"346\" \/><\/noscript><\/p>\n<blockquote><p><span style=\"color: #000000;\">\u6808\u4e2d\u4f1a\u51fa\u73b0\u5f02\u5e38,\u5f53\u7ebf\u7a0b\u8bf7\u6c42\u7684\u6808\u6df1\u5ea6\u5927\u4e8e\u865a\u62df\u673a\u6240\u5141\u8bb8\u7684\u6df1\u5ea6\u65f6 , \u4f1a\u51fa\u73b0StackOverflowError.<\/span><\/p><\/blockquote>\n<div><span style=\"color: #000000;\"><strong>\u6808\u7684\u8fd0\u884c\u539f\u7406 <\/strong><\/span><\/div>\n<ul>\n<li><span style=\"color: #000000;\">JVM \u76f4\u63a5\u5bf9 java \u6808\u7684\u64cd\u4f5c\u53ea\u6709\u4e24\u4e2a,\u5c31\u662f\u5bf9\u6808\u5e27\u7684\u5165\u6808\u548c\u51fa\u6808,\u9075\u5faa<\/span><span style=\"color: #000000;\"><strong>\u5148\u8fdb\u540e\u51fa\/<\/strong><\/span><span style=\"color: #000000;\"><strong>\u540e\u8fdb\u5148\u51fa<\/strong><\/span><span style=\"color: #000000;\">\u7684\u539f\u5219. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5728\u4e00\u6761\u6d3b\u52a8\u7684\u7ebf\u7a0b\u4e2d,\u4e00\u4e2a\u65f6\u95f4\u70b9\u4e0a,\u53ea\u4f1a\u6709\u4e00\u4e2a\u6d3b\u52a8\u6808.\u5373\u53ea\u6709\u5f53\u524d\u5728\u6267\u884c\u7684\u65b9\u6cd5\u7684\u6808\u5e27(\u6808\u9876)\u662f\u6709\u6548\u5730,\u8fd9\u4e2a\u6808\u5e27\u88ab\u79f0\u4e3a\u5f53\u524d\u6808(Current Frame),\u4e0e\u5f53\u524d\u6808\u5e27\u5bf9\u5e94\u7684\u65b9\u6cd5\u79f0\u4e3a\u5f53\u524d\u65b9\u6cd5(CurrentMethod),\u5b9a\u4e49\u8fd9\u4e2a\u65b9\u6cd5\u7684\u7c7b\u79f0\u4e3a\u5f53\u524d\u7c7b(Current Class). <\/span><\/li>\n<li><span style=\"color: #000000;\">\u6267\u884c\u5f15\u64ce\u8fd0\u884c\u7684\u6240\u6709\u5b57\u8282\u7801\u6307\u4ee4\u53ea\u9488\u5bf9\u5f53\u524d\u6808\u5e27\u8fdb\u884c\u64cd\u4f5c. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5982\u679c\u5728\u8be5\u65b9\u6cd5\u4e2d\u8c03\u7528\u4e86\u5176\u4ed6\u65b9\u6cd5,\u5bf9\u5e94\u7684\u65b0\u7684\u6808\u5e27\u5c31\u4f1a\u88ab\u521b\u5efa\u51fa\u6765,\u653e\u5728\u6808\u7684\u9876\u7aef,\u6210\u4e3a\u65b0\u7684\u5f53\u524d\u6808\u5e27.<\/span><\/li>\n<\/ul>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-12\/202307141358121c1c6c24a.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"556\" height=\"267\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-12\/202307141358121c1c6c24a.png\" alt=\"\" width=\"556\" height=\"267\" \/><\/noscript><\/p>\n<p>\u00a0<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4e0d\u540c\u7ebf\u7a0b\u4e2d\u6240\u5305\u542b\u7684\u6808\u5e27(\u65b9\u6cd5)\u662f\u4e0d\u5141\u8bb8\u5b58\u5728\u76f8\u4e92\u5f15\u7528\u7684,\u5373\u4e0d\u53ef\u80fd\u5728\u4e00\u4e2a\u6808\u4e2d\u5f15\u7528\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u7684\u6808\u5e27(\u65b9\u6cd5).<br \/>\n\u5982\u679c\u5f53\u524d\u65b9\u6cd5\u8c03\u7528\u4e86\u5176\u4ed6\u65b9\u6cd5,\u65b9\u6cd5\u8fd4\u56de\u4e4b\u9645,\u5f53\u524d\u6808\u5e27\u4f1a\u4f20\u56de\u6b64\u65b9\u6cd5\u7684\u6267\u884c\u7ed3\u679c\u7ed9\u524d\u4e00\u4e2a\u6808\u5e27,\u63a5\u7740\u865a\u62df\u673a\u4f1a\u4e22\u5f03\u5f53\u524d\u6808\u5e27,\u4f7f\u5f97\u524d\u4e00\u4e2a\u6808\u5e27\u91cd\u65b0\u6210\u4e3a\u5f53\u524d\u6808\u5e27.<br \/>\nJava \u65b9\u6cd5\u6709\u4e24\u79cd\u8fd4\u56de\u7684\u65b9\u5f0f,\u4e00\u79cd\u662f\u6b63\u5e38\u7684\u51fd\u6570\u8fd4\u56de,\u4f7f\u7528 return \u6307\u4ee4,\u53e6\u4e00\u79cd\u662f\u629b\u51fa\u5f02\u5e38.\u4e0d\u7ba1\u54ea\u79cd\u65b9\u5f0f,\u90fd\u4f1a\u5bfc\u81f4\u6808\u5e27\u88ab\u5f39\u51fa. <\/span><\/p>\n<div><span style=\"color: #000000;\"><strong>\u6808\u5e27\u7684\u5185\u90e8\u7ed3\u6784 <\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\">\u6bcf\u4e2a\u6808\u5e27\u4e2d\u5b58\u50a8\u7740: <\/span><\/div>\n<ul>\n<li><span style=\"color: #ff0000;\"><strong>\u5c40\u90e8\u53d8\u91cf\u8868(Local Variables) <\/strong><\/span><br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5c40\u90e8\u53d8\u91cf\u8868\u662f\u4e00\u7ec4\u53d8\u91cf\u503c\u5b58\u50a8\u7a7a\u95f4\uff0c\u7528\u4e8e\u5b58\u653e\u65b9\u6cd5\u53c2\u6570\u548c\u65b9\u6cd5\u5185\u90e8\u5b9a\u4e49\u7684\u5c40\u90e8\u53d8\u91cf\u3002\u5bf9\u4e8e\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u5219\u76f4\u63a5\u5b58\u50a8\u5b83\u7684\u503c\uff0c\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u5219\u5b58\u7684\u662f\u6307\u5411\u5bf9\u8c61\u7684\u5f15\u7528\u3002 <\/span><\/li>\n<li><span style=\"color: #ff0000;\"><strong>\u64cd\u4f5c\u6570\u6808(Operand Stack)(\u6216\u8868\u8fbe\u5f0f\u6808) <\/strong><\/span><br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u6808\u6700\u5178\u578b\u7684\u4e00\u4e2a\u5e94\u7528\u5c31\u662f\u7528\u6765\u5bf9\u8868\u8fbe\u5f0f\u6c42\u503c\u3002\u5728\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u65b9\u6cd5\u7684\u8fc7\u7a0b<\/span><span style=\"color: #000000;\">\u4e2d\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f\u4e0d\u65ad\u6267\u884c\u8bed\u53e5\u7684\u8fc7\u7a0b\uff0c\u800c\u5f52\u6839\u5230\u5e95\u5c31\u662f\u8fdb\u884c\u8ba1\u7b97\u7684\u8fc7\u7a0b\u3002\u56e0\u6b64\u53ef\u4ee5\u8fd9\u4e48\u8bf4\uff0c\u7a0b\u5e8f\u4e2d\u7684\u6240\u6709\u8ba1\u7b97\u8fc7\u7a0b\u90fd\u662f\u5728\u501f\u52a9\u4e8e\u64cd\u4f5c\u6570\u6808\u6765\u5b8c\u6210\u7684\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u52a8\u6001\u94fe\u63a5(Dynamic Linking) (\u6216\u6307\u5411\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u7684\u65b9\u6cd5\u5f15\u7528) <\/strong><\/span><br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u56e0\u4e3a\u5728\u65b9\u6cd5\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\u6709\u53ef\u80fd\u9700\u8981\u7528\u5230\u7c7b\u4e2d\u7684\u5e38\u91cf\uff0c\u6240\u4ee5\u5fc5\u987b\u8981\u6709\u4e00\u4e2a\u5f15\u7528\u6307\u5411\u8fd0\u884c\u65f6\u5e38\u91cf\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u65b9\u6cd5\u8fd4\u56de\u5730\u5740(Retuen Address)(\u6216\u65b9\u6cd5\u6b63\u5e38\u9000\u51fa\u6216\u8005\u5f02\u5e38\u9000\u51fa\u7684\u5b9a\u4e49) <\/strong><\/span><br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5f53\u4e00\u4e2a\u65b9\u6cd5\u6267\u884c\u5b8c\u6bd5\u4e4b\u540e\uff0c\u8981\u8fd4\u56de\u4e4b\u524d\u8c03\u7528\u5b83\u7684\u5730\u65b9\uff0c\u56e0\u6b64\u5728\u6808\u5e27\u4e2d\u5fc5\u987b\u4fdd\u5b58\u4e00\u4e2a\u65b9\u6cd5\u8fd4\u56de\u5730\u5740\u3002<\/span><\/li>\n<\/ul>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-12\/202307141358123838daab3.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"616\" height=\"216\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-12\/202307141358123838daab3.png\" alt=\"\" width=\"616\" height=\"216\" \/><\/noscript><\/p>\n<h2 id=\"3.4.%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95%E6%A0%88(Native%20Method%20Stack)\"><span style=\"color: #000000;\"><strong>3.4.\u672c\u5730\u65b9\u6cd5\u6808(Native Method Stack)<\/strong><\/span><\/h2>\n<ul>\n<li><span style=\"color: #000000;\">Java \u865a\u62df\u673a\u6808\u7ba1\u7406 java \u65b9\u6cd5\u7684\u8c03\u7528,\u800c\u672c\u5730\u65b9\u6cd5\u6808\u7528\u4e8e\u7ba1\u7406\u672c\u5730\u65b9\u6cd5\u7684\u8c03\u7528. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u672c\u5730\u65b9\u6cd5\u6808\u4e5f\u662f\u7ebf\u7a0b\u79c1\u6709\u7684. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5141\u8bb8\u88ab\u5b9e\u73b0\u6210\u56fa\u5b9a\u6216\u8005\u662f\u53ef\u52a8\u6001\u6269\u5c55\u7684\u5185\u5b58\u5927\u5c0f.\u5185\u5b58\u6ea2\u51fa\u65b9\u9762\u4e5f\u662f\u76f8\u540c\u7684. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5982\u679c\u7ebf\u7a0b\u8bf7\u6c42\u5206\u914d\u7684\u6808\u5bb9\u91cf\u8d85\u8fc7\u672c\u5730\u65b9\u6cd5\u6808\u5141\u8bb8\u7684\u6700\u5927\u5bb9\u91cf\u629b\u51fa StackOverflowError.\uf0d8<\/span><span style=\"color: #000000;\">\u672c\u5730\u65b9\u6cd5\u662f\u7528 C \u8bed\u8a00\u5199\u7684. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5b83\u7684\u5177\u4f53\u505a\u6cd5\u662f\u5728 Native Method Stack \u4e2d\u767b\u8bb0 native \u65b9\u6cd5,\u5728 Execution Engine \u6267\u884c\u65f6\u52a0\u8f7d\u672c\u5730\u65b9\u6cd5\u5e93. <\/span><\/li>\n<\/ul>\n<h2 id=\"3.5.Java%20%E5%A0%86%E5%86%85%E5%AD%98\"><span style=\"color: #000000;\"><strong>3.5.Java \u5806\u5185\u5b58<\/strong><\/span><\/h2>\n<h3 id=\"3.5.1Java%E5%A0%86%E5%86%85%E5%AD%98%E6%A6%82%E8%BF%B0\"><span style=\"color: #000000;\"><strong>3.5.1Java\u5806\u5185\u5b58\u6982\u8ff0<\/strong><\/span><\/h3>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-13\/20230714135813b4b41fc47.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"569\" height=\"301\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-13\/20230714135813b4b41fc47.png\" alt=\"\" width=\"569\" height=\"301\" \/><\/noscript><\/p>\n<ul>\n<li><span style=\"color: #000000;\">\u4e00\u4e2a JVM \u5b9e\u4f8b\u53ea\u5b58\u5728\u4e00\u4e2a\u5806\u5185\u5b58,\u5806\u4e5f\u662f Java \u5185\u5b58\u7ba1\u7406\u7684\u6838\u5fc3\u533a\u57df. <\/span><\/li>\n<li><span style=\"color: #000000;\">Java \u5806\u533a\u5728 JVM \u542f\u52a8\u65f6\u7684\u65f6\u5019\u5373\u88ab\u521b\u5efa,\u5176\u7a7a\u95f4\u5927\u5c0f\u4e5f\u5c31\u786e\u5b9a\u4e86,\u662f JVM \u7ba1\u7406<\/span><span style=\"color: #000000;\">\u7684\u6700\u5927\u4e00\u5757\u5185\u5b58\u7a7a\u95f4. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5806\u5185\u5b58\u7684\u5927\u5c0f\u662f\u53ef\u4ee5\u8c03\u8282. <\/span><br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4f8b\u5982: -Xms:10m(\u5806\u8d77\u59cb\u5927\u5c0f) -Xmx:30m(\u5806\u6700\u5927\u5185\u5b58\u5927\u5c0f) <\/span><br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4e00\u822c\u60c5\u51b5\u53ef\u4ee5\u5c06\u8d77\u59cb\u503c\u548c\u6700\u5927\u503c\u8bbe\u7f6e\u4e3a\u4e00\u81f4,\u8fd9\u6837\u4f1a\u51cf\u5c11\u5783\u573e\u56de\u6536\u4e4b\u540e\u5806\u5185\u5b58\u91cd<\/span><span style=\"color: #000000;\">\u65b0\u5206\u914d\u5927\u5c0f\u7684\u6b21\u6570,\u63d0\u9ad8\u6548\u7387. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u300a<\/span><span style=\"color: #000000;\">Java \u865a\u62df\u673a\u89c4\u8303\u300b\u89c4\u5b9a,\u5806\u53ef\u4ee5\u5904\u4e8e\u7269\u7406\u4e0a\u4e0d\u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4\u4e2d,\u4f46\u903b\u8f91\u4e0a\u5b83<\/span><span style=\"color: #000000;\">\u5e94\u8be5\u88ab\u89c6\u4e3a\u8fde\u7eed\u7684. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u6240\u6709\u7684\u7ebf\u7a0b\u5171\u4eab Java \u5806,\u5728\u8fd9\u91cc\u8fd8\u53ef\u4ee5\u5212\u5206\u7ebf\u7a0b\u79c1\u6709\u7684\u7f13\u51b2\u533a. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u300a<\/span><span style=\"color: #000000;\">Java \u865a\u62df\u673a\u89c4\u8303\u300b\u4e2d\u5bf9 Java \u5806\u7684\u63cf\u8ff0\u662f:\u6240\u6709\u7684\u5bf9\u8c61\u5b9e\u4f8b\u90fd\u5e94\u5f53\u5728\u8fd0\u884c\u65f6\u5206<\/span><span style=\"color: #000000;\">\u914d\u5728\u5806\u4e0a. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5728\u65b9\u6cd5\u7ed3\u675f\u540e,\u5806\u4e2d\u7684\u5bf9\u8c61\u4e0d\u4f1a\u9a6c\u4e0a\u88ab\u79fb\u9664,\u4ec5\u4ec5\u5728\u5783\u573e\u6536\u96c6\u7684\u65f6\u5019\u624d\u4f1a\u88ab\u79fb\u9664. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5806\u662f GC(Garbage Collection,\u5783\u573e\u6536\u96c6\u5668)\u6267\u884c\u5783\u573e\u56de\u6536\u7684\u91cd\u70b9\u533a\u57df.<\/span><\/li>\n<\/ul>\n<h3 id=\"3.5.2%E5%A0%86%E5%86%85%E5%AD%98%E5%8C%BA%E5%9F%9F%E5%88%92%E5%88%86\">3.5.2\u5806\u5185\u5b58\u533a\u57df\u5212\u5206<\/h3>\n<div><span style=\"color: #000000;\">Java8 \u53ca\u4e4b\u540e\u5806\u5185\u5b58\u5206\u4e3a<\/span> <span style=\"color: #000000;\"><strong>:\u65b0\u751f\u533a(\u65b0\u751f\u4ee3)+\u8001\u5e74\u533a(\u8001\u5e74\u4ee3) <\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\"><strong>\u65b0\u751f\u533a\u5206\u4e3a Eden(\u4f0a\u7538\u56ed)\u533a\u548c Survivor(\u5e78\u5b58\u8005)\u533a<\/strong><\/span><\/div>\n<div><\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-13\/2023071413581335357864e.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"933\" height=\"482\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-13\/2023071413581335357864e.png\" alt=\"\" width=\"933\" height=\"482\" \/><\/noscript><\/div>\n<h3><\/h3>\n<h3 id=\"3.5.3%20%E4%B8%BA%E4%BB%80%E4%B9%88%E5%88%86%E5%8C%BA(%E4%BB%A3)%EF%BC%9F\"><span style=\"color: #000000;\"><strong>3.5.3 \u4e3a\u4ec0\u4e48\u5206\u533a(\u4ee3)\uff1f<\/strong><\/span><\/h3>\n<blockquote>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5c06\u5bf9\u8c61\u6839\u636e\u5b58\u6d3b\u6982\u7387\u8fdb\u884c\u5206\u7c7b\uff0c\u5bf9\u5b58\u6d3b\u65f6\u95f4\u957f\u7684\u5bf9\u8c61\uff0c\u653e\u5230\u56fa\u5b9a\u533a\uff0c\u4ece\u800c\u51cf\u5c11\u626b\u63cf\u5783\u573e\u65f6\u95f4\u53ca GC \u9891\u7387\u3002<\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u9488\u5bf9\u5206\u7c7b\u8fdb\u884c\u4e0d\u540c\u7684\u5783\u573e\u56de\u6536\u7b97\u6cd5\uff0c\u5bf9\u7b97\u6cd5\u626c\u957f\u907f\u77ed\u3002<\/span><\/div>\n<\/blockquote>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-14\/202307141358145757cbbde.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"521\" height=\"431\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-14\/202307141358145757cbbde.png\" alt=\"\" width=\"521\" height=\"431\" \/><\/noscript><\/p>\n<h3 id=\"3.5.4%20%E5%AF%B9%E8%B1%A1%E5%88%9B%E5%BB%BA%E5%86%85%E5%AD%98%E5%88%86%E9%85%8D%E8%BF%87%E7%A8%8B\"><span style=\"color: #000000;\"><strong>3.5.4 \u5bf9\u8c61\u521b\u5efa\u5185\u5b58\u5206\u914d\u8fc7\u7a0b<\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4e3a\u65b0\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u662f\u4e00\u4ef6\u975e\u5e38\u4e25\u8c28\u548c\u590d\u6742\u7684\u4efb\u52a1,JVM \u7684\u8bbe\u8ba1\u8005\u4eec\u4e0d\u4ec5\u9700\u8981\u8003\u8651\u5185\u5b58\u5982\u4f55\u5206\u914d,\u5728\u54ea\u5206\u914d\u7b49\u95ee\u9898,\u5e76\u4e14\u7531\u4e8e\u5185\u5b58\u5206\u914d\u7b97\u6cd5\u4e0e\u5185\u5b58\u56de\u6536\u7b97\u6cd5\u5bc6\u5207\u76f8\u5173,\u6240\u4ee5\u8fd8\u9700\u8981\u8003\u8651 GC \u6267\u884c\u5b8c\u5185\u5b58\u56de\u6536\u540e\u662f\u5426\u4f1a\u5728\u5185\u5b58\u7a7a\u95f4\u4e2d\u4ea7\u751f\u5185\u5b58\u788e\u7247.<\/span><\/div>\n<div><\/div>\n<div><\/div>\n<ol>\n<li><span style=\"color: #000000;\">new \u7684\u65b0\u5bf9\u8c61\u5148\u653e\u5230\u4f0a\u7538\u56ed\u533a,\u6b64\u533a\u5927\u5c0f\u6709\u9650\u5236. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5f53\u4f0a\u7538\u56ed\u7684\u7a7a\u95f4\u586b\u6ee1\u65f6,\u7a0b\u5e8f\u53c8\u9700\u8981\u521b\u5efa\u5bf9\u8c61\u65f6,JVM \u7684\u5783\u573e\u56de\u6536\u5668\u5c06\u5bf9\u4f0a\u7538\u56ed\u533a\u8fdb<\/span><span style=\"color: #000000;\">\u884c\u5783\u573e\u56de\u6536(Minor GC),\u5c06\u4f0a\u7538\u56ed\u533a\u4e2d\u7684\u4e0d\u518d\u88ab\u5f15\u7528\u7684\u5bf9\u8c61\u8fdb\u884c\u9500\u6bc1.\u518d\u52a0\u8f7d\u65b0\u7684\u5bf9\u8c61\u653e<\/span><span style=\"color: #000000;\">\u5230\u4f0a\u7538\u56ed\u533a. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u7136\u540e\u5c06\u4f0a\u7538\u56ed\u533a\u4e2d\u7684\u5269\u4f59\u5bf9\u8c61\u79fb\u52a8\u5230\u5e78\u5b58\u8005 0 \u533a. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5982\u679c\u518d\u6b21\u51fa\u53d1\u5783\u573e\u56de\u6536,\u6b64\u65f6\u4e0a\u6b21\u5e78\u5b58\u4e0b\u6765\u5b58\u653e\u5230\u5e78\u5b58\u8005 0 \u533a\u7684\u5bf9\u8c61,\u5982\u679c\u6ca1\u6709\u56de\u6536,<\/span><span style=\"color: #000000;\">\u5c31\u4f1a\u88ab\u653e\u5230\u5e78\u5b58\u8005 1 \u533a,\u6bcf\u6b21\u4f1a\u4fdd\u8bc1\u6709\u4e00\u4e2a\u5e78\u5b58\u8005\u533a\u662f\u7a7a\u7684. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5982\u679c\u518d\u6b21\u7ecf\u5386\u5783\u573e\u56de\u6536,\u6b64\u65f6\u4f1a\u91cd\u65b0\u653e\u56de\u5e78\u5b58\u8005 0 \u533a,\u63a5\u7740\u518d\u53bb\u5e78\u5b58\u8005 1 \u533a. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u4ec0\u4e48\u65f6\u5019\u53bb\u517b\u8001\u533a\u5462?\u9ed8\u8ba4\u662f 15 \u6b21,\u4e5f\u53ef\u4ee5\u8bbe\u7f6e\u53c2\u6570,\u6700\u5927\u503c\u4e3a 15 <\/span><br \/>\n<span style=\"color: #000000;\">-XX:MaxTenuringThreshold=&lt;N&gt; <\/span><br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5728\u5bf9\u8c61\u5934\u4e2d\uff0c\u5b83\u662f\u7531 4 \u4f4d\u6570\u636e\u6765\u5bf9 GC \u5e74\u9f84\u8fdb\u884c\u4fdd\u5b58\u7684\uff0c\u6240\u4ee5\u6700\u5927\u503c\u4e3a 1111\uff0c<\/span><span style=\"color: #000000;\">\u5373\u4e3a15\u3002\u6240\u4ee5\u5728\u5bf9\u8c61\u7684 GC \u5e74\u9f84\u8fbe\u5230 15 \u65f6\uff0c\u5c31\u4f1a\u4ece\u65b0\u751f\u4ee3\u8f6c\u5230\u8001\u5e74\u4ee3\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5728\u8001\u5e74\u533a,\u76f8\u5bf9\u60a0\u95f2,\u5f53\u517b\u8001\u533a\u5185\u5b58\u4e0d\u8db3\u65f6,\u518d\u6b21\u89e6\u53d1 Major GC,\u8fdb\u884c\u517b\u8001\u533a\u7684\u5185\u5b58\u6e05<\/span><span style=\"color: #000000;\">\u7406. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u82e5\u517b\u8001\u533a\u6267\u884c\u4e86 Major GC \u4e4b\u540e\u53d1\u73b0\u4f9d\u7136\u65e0\u6cd5\u8fdb\u884c\u5bf9\u8c61\u4fdd\u5b58,\u5c31\u4f1a\u4ea7\u751f OOM \u5f02\u5e38. <\/span><span style=\"color: #000000;\">Java.lang.OutOfMemoryError:Java heap space<\/span><\/li>\n<\/ol>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-java\">public static void main(String[] args) {\n    List&lt;Integer&gt; list = new ArrayList();\n    while(true){\n        list.add(new Random().nextInt());\n    }\n}<\/code><\/pre>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-14\/202307141358145959be0b5.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"690\" height=\"388\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-14\/202307141358145959be0b5.png\" alt=\"\" width=\"690\" height=\"388\" \/><\/noscript><\/p>\n<div><\/div>\n<h3 id=\"3.5.5%20%E6%96%B0%E7%94%9F%E5%8C%BA%E4%B8%8E%E8%80%81%E5%B9%B4%E5%8C%BA%E9%85%8D%E7%BD%AE%E6%AF%94%E4%BE%8B\"><span style=\"color: #000000;\"><strong>3.5.5 \u65b0\u751f\u533a\u4e0e\u8001\u5e74\u533a\u914d\u7f6e\u6bd4\u4f8b<\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u914d\u7f6e\u65b0\u751f\u4ee3\u4e0e\u8001\u5e74\u4ee3\u5728\u5806\u7ed3\u6784\u7684\u5360\u6bd4\uff08\u4e00\u822c\u4e0d\u4f1a\u8c03\uff09 <\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u9ed8\u8ba4**-XX:NewRatio**=2\uff0c\u8868\u793a\u65b0\u751f\u4ee3\u5360 1\uff0c\u8001\u5e74\u4ee3\u5360 2\uff0c\u65b0\u751f\u4ee3\u5360\u6574<\/span><span style=\"color: #000000;\">\u4e2a\u5806\u7684 1\/3 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u53ef\u4ee5\u4fee\u6539**-XX:NewRatio**=4\uff0c\u8868\u793a\u65b0\u751f\u4ee3\u5360 1\uff0c\u8001\u5e74\u4ee3\u5360 4\uff0c\u65b0\u751f\u4ee3<\/span><span style=\"color: #000000;\">\u5360\u6574\u4e2a\u5806\u7684 1\/5 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5f53\u53d1\u73b0\u5728\u6574\u4e2a\u9879\u76ee\u4e2d\uff0c\u751f\u547d\u5468\u671f\u957f\u7684\u5bf9\u8c61\u504f\u591a\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u901a\u8fc7\u8c03\u6574\u8001\u5e74<\/span><span style=\"color: #000000;\">\u4ee3\u7684\u5927\u5c0f\uff0c\u6765\u8fdb\u884c\u8c03\u4f18 <\/span><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-14\/20230714135814d7d718685.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"817\" height=\"171\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-14\/20230714135814d7d718685.png\" alt=\"\" width=\"817\" height=\"171\" \/><\/noscript><\/li>\n<li><span style=\"color: #000000;\">\u5728 HotSpot \u4e2d\uff0c<\/span><span style=\"color: #000000;\">Eden \u7a7a\u95f4\u548c\u53e6\u5916\u4e24\u4e2a survivor \u7a7a\u95f4\u7f3a\u7701\u6240\u5360\u7684\u6bd4\u4f8b\u662f 8 : 1 :<\/span><span style=\"color: #000000;\">1\uff0c\u5f53\u7136\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u901a\u8fc7\u9009\u9879**-XX:SurvivorRatio**\u8c03\u6574\u8fd9\u4e2a\u7a7a\u95f4\u6bd4\u4f8b\u3002\u6bd4<\/span><span style=\"color: #000000;\">\u5982-XX:SurvivorRatio=8\uff0c<\/span><span style=\"color: #000000;\">\u65b0\u751f\u533a<\/span><span style=\"color: #000000;\">\u7684\u5bf9\u8c61\u9ed8\u8ba4\u751f\u547d\u5468\u671f\u8d85\u8fc7 15 \uff0c\u5c31\u4f1a\u53bb\u517b\u8001\u533a\u517b\u8001<\/span><\/li>\n<\/ol>\n<h3 id=\"%C2%A03.5.6%20%E5%88%86%E4%BB%A3%E6%94%B6%E9%9B%86%E6%80%9D%E6%83%B3%20Minor%20GC%E3%80%81Major%20GC%E3%80%81Full%20GC\">\u00a0<span style=\"color: #000000;\"><strong>3.5.6 \u5206\u4ee3\u6536\u96c6\u601d\u60f3 Minor GC\u3001Major GC\u3001Full GC<\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0JVM \u5728\u8fdb\u884c GC \u65f6,\u5e76\u975e\u6bcf\u6b21\u90fd\u65b0\u751f\u533a\u548c\u8001\u5e74\u533a\u4e00\u8d77\u56de\u6536\u7684,\u5927\u90e8\u5206\u65f6\u5019\u56de\u6536\u7684\u90fd\u662f\u6307\u65b0\u751f\u533a.\u9488<\/span><\/div>\n<div><span style=\"color: #000000;\">\u5bf9 HotSpot VM \u7684\u5b9e\u73b0,\u5b83\u91cc\u9762\u7684 GC \u6309\u7167\u56de\u6536\u533a\u57df\u53c8\u5206\u4e3a\u4e24\u5927\u7c7b\u578b:\u4e00\u79cd\u662f\u90e8\u5206\u6536\u96c6,\u4e00\u79cd\u662f\u6574\u5806\u6536\u96c6. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u90e8\u5206\u6536\u96c6:\u4e0d\u662f\u5b8c\u6574\u6536\u96c6\u6574\u4e2a java \u5806\u7684\u5783\u573e\u6536\u96c6.\u5176\u4e2d\u53c8\u5206\u4e3a: <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u65b0\u751f\u533a\u6536\u96c6(Minor GC\/Yong GC):\u53ea\u662f\u65b0\u751f\u533a(Eden,S0,S1)\u7684\u5783\u573e\u6536\u96c6. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u8001\u5e74\u533a\u6536\u96c6(Major GC \/ Old GC):\u53ea\u662f\u8001\u5e74\u533a\u7684\u5783\u573e\u6536\u96c6. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u6574\u5806\u6536\u96c6(Full GC):\u6536\u96c6\u6574\u4e2a java \u5806\u548c\u65b9\u6cd5\u533a\u7684\u5783\u573e\u6536\u96c6. <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u6574\u5806\u6536\u96c6\u51fa\u73b0\u7684\u60c5\u51b5: <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 System.gc();\u65f6 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u8001\u5e74\u533a\u7a7a\u95f4\u4e0d\u8db3 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u65b9\u6cd5\u533a\u7a7a\u95f4\u4e0d\u8db3 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u5f00\u53d1\u671f\u95f4\u5c3d\u91cf\u907f\u514d\u6574\u5806\u6536\u96c6<\/span><\/div>\n<h3 id=\"3.5.7%20%E5%A0%86%E7%A9%BA%E9%97%B4%E7%9A%84%E5%8F%82%E6%95%B0%E8%AE%BE%E7%BD%AE\"><span style=\"color: #000000;\"><strong>3.5.7 \u5806\u7a7a\u95f4\u7684\u53c2\u6570\u8bbe\u7f6e<\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\"><a class=\"link-info\" title=\"\u5b98\u7f51\u5730\u5740\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/technotes\/tools\/unix\/java.html\" target=\"_blank\"  rel=\"nofollow\" >\u5b98\u7f51\u5730\u5740<\/a><\/span><\/div>\n<div><\/div>\n<div>\n<table style=\"width: 500px;\" border=\"1\" cellspacing=\"1\" cellpadding=\"1\">\n<tbody>\n<tr>\n<td>\n<div><span style=\"color: #000000;\">-XX:+PrintFlagsInitial<\/span><\/div>\n<\/td>\n<td>\n<div><span style=\"color: #000000;\">\u67e5\u770b\u6240\u6709\u53c2\u6570\u7684\u9ed8\u8ba4\u521d\u59cb\u503c<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div><span style=\"color: #000000;\">-XX:+PrintFlagsFinal<\/span><\/div>\n<\/td>\n<td>\n<div><span style=\"color: #000000;\">\u67e5\u770b\u6240\u6709\u53c2\u6570\u7684\u6700\u7ec8\u503c(\u4fee\u6539\u540e\u7684\u503c)<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div><span style=\"color: #000000;\">-Xms<\/span><\/div>\n<\/td>\n<td>\n<div><span style=\"color: #000000;\">\u521d\u59cb\u5806\u7a7a\u95f4\u5185\u5b58(\u9ed8\u8ba4\u4e3a\u7269\u7406\u5185\u5b58\u7684 1\/64)<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div><span style=\"color: #000000;\">-Xmx<\/span><\/div>\n<\/td>\n<td>\n<div><span style=\"color: #000000;\">\u6700\u5927\u5806\u7a7a\u95f4\u5185\u5b58(\u9ed8\u8ba4\u4e3a\u7269\u7406\u5185\u5b58\u7684 1\/4)<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div><span style=\"color: #000000;\">-Xmn<\/span><\/div>\n<\/td>\n<td>\n<div><span style=\"color: #000000;\">\u8bbe\u7f6e\u65b0\u751f\u4ee3\u7684\u5927\u5c0f(\u521d\u59cb\u503c\u53ca\u6700\u5927\u503c)<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div><span style=\"color: #000000;\">-XX:NewRatio<\/span><\/div>\n<\/td>\n<td>\n<div><span style=\"color: #000000;\">\u914d\u7f6e\u65b0\u751f\u4ee3\u4e0e\u8001\u5e74\u4ee3\u5728\u5806\u7ed3\u6784\u7684\u5360\u6bd4<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div><span style=\"color: #000000;\">-XX:SurvivorRatio<\/span><\/div>\n<\/td>\n<td>\n<div><span style=\"color: #000000;\">\u8bbe\u7f6e\u65b0\u751f\u4ee3\u4e2d Eden \u548c S0\/S1 \u7a7a\u95f4\u6bd4\u4f8b<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div><span style=\"color: #000000;\">-XX:MaxTenuringTreshold<\/span><\/div>\n<\/td>\n<td>\n<div><span style=\"color: #000000;\">\u8bbe\u7f6e\u65b0\u751f\u4ee3\u5783\u573e\u7684\u6700\u5927\u5e74\u9f84<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div><span style=\"color: #000000;\">XX:+PrintGCDetails<\/span><\/div>\n<\/td>\n<td>\n<div><span style=\"color: #000000;\">\u8f93\u51fa\u8be6\u7ec6\u7684 GC \u5904\u7406\u65e5\u5fd7<\/span><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 id=\"3.5.8%20%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%B8%B8%E9%87%8F%E6%B1%A0\"><span style=\"color: #000000;\"><strong>3.5.8 \u5b57\u7b26\u4e32\u5e38\u91cf\u6c60<\/strong><\/span><\/h3>\n<\/div>\n<div><span style=\"color: #000000;\"><strong>\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e3a\u4ec0\u4e48\u8981\u8c03\u6574\u4f4d\u7f6e\uff1f <\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0JDK7 \u53ca\u4ee5\u540e\u7684\u7248\u672c\u4e2d\u5c06\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u653e\u5230\u4e86\u5806\u7a7a\u95f4\u4e2d\u3002\u56e0\u4e3a\u65b9\u6cd5\u533a\u7684\u56de\u6536\u6548\u7387\u5f88\u4f4e\uff0c\u5728 Full GC \u7684\u65f6\u5019\u624d\u4f1a\u6267\u884c\u6c38\u4e45\u4ee3\u7684\u5783\u573e\u56de\u6536\uff0c\u800c Full GC \u662f\u8001\u5e74\u4ee3\u7684\u7a7a\u95f4\u4e0d\u8db3\u3001\u65b9\u6cd5\u533a\u4e0d\u8db3\u65f6\u624d\u4f1a\u89e6\u53d1\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u8fd9\u5c31\u5bfc\u81f4\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u56de\u6536\u6548\u7387\u4e0d\u9ad8\uff0c\u800c\u6211\u4eec\u5f00\u53d1\u4e2d\u4f1a\u6709\u5927\u91cf\u7684\u5b57\u7b26\u4e32\u88ab\u521b\u5efa\uff0c<\/span>\u56de\u6536\u6548\u7387\u4f4e\uff0c\u5bfc\u81f4\u6c38\u4e45\u4ee3\u5185\u5b58\u4e0d\u8db3\u3002\u653e\u5230\u5806\u91cc\uff0c\u80fd\u53ca\u65f6\u56de\u6536\u5185\u5b58\u3002<\/div>\n<div>\n<pre><code class=\"language-java\">public static void main(String[] args) {\n    String temp = \"world\";\n    for (int i = 0; i &lt; Integer.MAX_VALUE; i++) {\n        String str = temp + temp;\n        temp = str;\n        str.intern();\/\/\u5c06\u5b57\u7b26\u4e32\u5b58\u50a8\u5230\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\n    }\n}<\/code><\/pre>\n<\/div>\n<h2 id=\"3.6%E6%96%B9%E6%B3%95%E5%8C%BA\"><span style=\"color: #000000;\"><strong>3.6\u65b9\u6cd5\u533a<\/strong><\/span><\/h2>\n<h3 id=\"3.6.1%20%E6%96%B9%E6%B3%95%E5%8C%BA%E7%9A%84%E5%9F%BA%E6%9C%AC%E7%90%86%E8%A7%A3\"><span style=\"color: #000000;\"><strong>3.6.1 \u65b9\u6cd5\u533a\u7684\u57fa\u672c\u7406\u89e3<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u65b9\u6cd5\u533a\uff0c\u662f\u4e00\u4e2a\u88ab\u7ebf\u7a0b\u5171\u4eab\u7684\u5185\u5b58\u533a\u57df\u3002\u5176\u4e2d\u4e3b\u8981\u5b58\u50a8\u52a0\u8f7d\u7684\u7c7b\u5b57\u8282\u7801\u3001class\/method\/field \u7b49\u5143\u6570\u636e\u3001static final \u5e38\u91cf\u3001static \u53d8\u91cf\u3001\u5373\u65f6\u7f16\u8bd1\u5668\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u7b49\u6570\u636e\u3002\u53e6\u5916\uff0c\u65b9\u6cd5\u533a\u5305\u542b\u4e86\u4e00\u4e2a\u7279\u6b8a\u7684\u533a\u57df\u201c\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u201d\u3002 <\/span><\/p>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0Java \u865a\u62df\u673a\u89c4\u8303\u4e2d\u660e\u786e\u8bf4\u660e:\u201d\u5c3d\u7ba1\u6240\u6709\u7684\u65b9\u6cd5\u533a\u5728\u903b\u8f91\u4e0a\u662f\u5c5e\u4e8e\u5806\u7684\u4e00\u90e8\u5206,\u4f46\u5bf9HotSpotJVM \u800c\u8a00,\u65b9\u6cd5\u533a\u8fd8\u6709\u4e00\u4e2a\u522b\u540d\u53eb\u505a Non-Heap(\u975e\u5806),\u76ee\u7684\u5c31\u662f\u8981\u548c\u5806\u5206\u5f00. <\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>\u6240\u4ee5,\u65b9\u6cd5\u533a\u770b\u505a\u662f\u4e00\u5757\u72ec\u7acb\u4e8e java \u5806\u7684\u5185\u5b58\u7a7a\u95f4.<\/strong><\/span><\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-15\/20230714135815a1a10604e.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"909\" height=\"336\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-15\/20230714135815a1a10604e.png\" alt=\"\" width=\"909\" height=\"336\" \/><\/noscript><\/div>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0\u65b9\u6cd5\u533a\u5728 JVM \u542f\u52a8\u65f6\u88ab\u521b\u5efa,\u5e76\u4e14\u5b83\u7684\u5b9e\u9645\u7684\u7269\u7406\u5185\u5b58\u7a7a\u95f4\u4e2d\u548c Java \u5806\u533a\u4e00\u6837\u90fd\u53ef\u4ee5\u662f\u4e0d\u8fde\u7eed\u7684.<br \/>\n\u65b9\u6cd5\u533a\u7684\u5927\u5c0f,\u8ddf\u5806\u7a7a\u95f4\u4e00\u6837,\u53ef\u4ee5\u9009\u62e9\u56fa\u5b9a\u5927\u5c0f\u6216\u8005\u53ef\u6269\u5c55.<br \/>\n\u65b9\u6cd5\u533a\u7684\u5927\u5c0f\u51b3\u5b9a\u4e86\u7cfb\u7edf\u53ef\u4ee5\u4fdd\u5b58\u591a\u5c11\u4e2a\u7c7b,\u5982\u679c\u7cfb\u7edf\u5b9a\u4e49\u4e86\u592a\u591a\u7684\u7c7b,\u5bfc\u81f4\u65b9\u6cd5\u533a\u6ea2\u51fa, \u865a\u62df\u673a\u540c\u6837\u4f1a\u629b\u51fa\u5185\u5b58\u6ea2\u51fa\u7684\u9519\u8bef<br \/>\n\u5173\u95ed JVM \u5c31\u4f1a\u91ca\u653e\u8fd9\u4e2a\u533a\u57df\u7684\u5185\u5b58. <\/span><\/p>\n<div><span style=\"color: #000000;\"><strong>\u65b9\u6cd5\u533a,\u6808,\u5806\u7684\u4ea4\u4e92\u5173\u7cfb<\/strong><\/span><\/div>\n<div><\/div>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-15\/20230714135815f3f3349b6.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"587\" height=\"284\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-15\/20230714135815f3f3349b6.png\" alt=\"\" width=\"587\" height=\"284\" \/><\/noscript><\/p>\n<\/div>\n<h3 id=\"3.6.2%20%E6%96%B9%E6%B3%95%E5%8C%BA%E5%A4%A7%E5%B0%8F%E8%AE%BE%E7%BD%AE\"><span style=\"color: #000000;\"><strong>3.6.2 \u65b9\u6cd5\u533a\u5927\u5c0f\u8bbe\u7f6e<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">Java \u65b9\u6cd5\u533a\u7684\u5927\u5c0f\u4e0d\u5fc5\u662f\u56fa\u5b9a\u7684,JVM \u53ef\u4ee5\u6839\u636e\u5e94\u7528\u7684\u9700\u8981\u52a8\u6001\u8c03\u6574. <\/span><\/p>\n<ol>\n<li><span style=\"color: #000000;\">\u5143\u6570\u636e\u533a\u5927\u5c0f\u53ef\u4ee5\u4f7f\u7528\u53c2\u6570-XX:MetaspaceSize \u548c <\/span><span style=\"color: #000000;\">-XX:MaxMataspaceSize \u6307\u5b9a,\u66ff\u4ee3\u4e0a\u8ff0\u539f\u6709\u7684\u4e24\u4e2a\u53c2\u6570. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u9ed8\u8ba4\u503c\u4f9d\u8d56\u4e8e\u5e73\u53f0,windows \u4e0b,-XXMetaspaceSize \u662f 21MB, <\/span><\/li>\n<li><span style=\"color: #000000;\">-XX:MaxMetaspaceSize \u7684\u503c\u662f-1,\u7ea7\u6ca1\u6709\u9650\u5236. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u8fd9\u4e2a-XX:MetaspaceSize \u521d\u59cb\u503c\u662f 21M \u4e5f\u79f0\u4e3a\u9ad8\u6c34\u4f4d\u7ebf \u4e00\u65e6\u89e6\u53ca\u5c31<\/span><span style=\"color: #000000;\">\u4f1a\u89e6\u53d1 Full GC. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u56e0\u6b64\u4e3a\u4e86\u51cf\u5c11 FullGC \u90a3\u4e48\u8fd9\u4e2a-XX:MetaspaceSize \u53ef\u4ee5\u8bbe\u7f6e\u4e00\u4e2a\u8f83\u9ad8<\/span><span style=\"color: #000000;\">\u7684\u503c<\/span><\/li>\n<\/ol>\n<h3 id=\"3.6.3%C2%A0%E6%96%B9%E6%B3%95%E5%8C%BA%E7%9A%84%E5%86%85%E9%83%A8%E7%BB%93%E6%9E%84\"><span style=\"color: #000000;\"><strong>3.6.3\u00a0\u65b9\u6cd5\u533a\u7684\u5185\u90e8\u7ed3\u6784<\/strong><\/span><\/h3>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-15\/20230714135815484875139.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"595\" height=\"322\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-15\/20230714135815484875139.png\" alt=\"\" width=\"595\" height=\"322\" \/><\/noscript><\/p>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u65b9\u6cd5\u533a\u5b83\u7528\u4e8e\u5b58\u50a8\u5df2\u88ab\u865a\u62df\u673a\u52a0\u8f7d\u7684\u7c7b\u578b\u4fe1\u606f\u3001\u5e38\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u5373\u65f6\u7f16\u8bd1\u5668\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u7f13\u5b58,\u8fd0\u884c\u5e38\u91cf\u6c60\u7b49\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u8fd0\u884c\u5e38\u91cf\u6c60\u5c31\u662f\u4e00\u5f20\u8868\uff0c\u865a\u62df\u673a\u6307\u4ee4\u6839\u636e\u8fd9\u5f20\u8868\uff0c\u627e\u5230\u8981\u6267\u884c\u7684\u7c7b\u540d\u3001\u65b9\u6cd5\u540d\u3001\u53c2\u6570\u7c7b\u578b\u3001\u5b57\u9762\u91cf\uff08\u5e38\u91cf\uff09\u7b49\u4fe1\u606f,\u5b58\u653e\u7f16\u8bd1\u671f\u95f4\u751f\u6210\u7684\u5404\u79cd\u5b57\u9762\u91cf\uff08\u5e38\u91cf\uff09\u548c\u7b26\u53f7\u5f15\u7528\u3002 <\/span><\/div>\n<div><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>\u901a\u8fc7\u53cd\u7f16\u8bd1\u5b57\u8282\u7801\u6587\u4ef6\u67e5\u770b. <\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u53cd\u7f16\u8bd1\u5b57\u8282\u7801\u6587\u4ef6\uff0c\u5e76\u8f93\u51fa\u503c\u6587\u672c\u6587\u4ef6\u4e2d\uff0c\u4fbf\u4e8e\u67e5\u770b\u3002\u53c2\u6570 -p \u786e\u4fdd\u80fd\u67e5\u770bprivate \u6743\u9650\u7c7b\u578b\u7684\u5b57\u6bb5\u6216\u65b9\u6cd5<\/span><\/div>\n<blockquote>\n<p style=\"text-align: center;\">\u00a0<span style=\"color: #0000ff;\"><strong>javap -v -p Demo.class &gt; test.txt<\/strong><\/span><\/p>\n<\/blockquote>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-16\/20230714135816ffffd86e6.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"480\" height=\"304\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-16\/20230714135816ffffd86e6.png\" alt=\"\" width=\"480\" height=\"304\" \/><\/noscript><\/p>\n<h3 id=\"3.6.4%C2%A0%E6%96%B9%E6%B3%95%E5%8C%BA%E7%9A%84%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6\"><span style=\"color: #000000;\"><strong>3.6.4\u00a0\u65b9\u6cd5\u533a\u7684\u5783\u573e\u56de\u6536<\/strong><\/span><\/h3>\n<ol>\n<li><span style=\"color: #000000;\">\u6709\u4e9b\u4eba\u8ba4\u4e3a\u65b9\u6cd5\u533a\uff08\u5982 Hotspot \u865a\u62df\u673a\u4e2d\u7684\u5143\u7a7a\u95f4\u6216\u8005\u6c38\u4e45\u4ee3\uff09\u662f\u6ca1\u6709\u5783\u573e<\/span><span style=\"color: #000000;\">\u6536\u96c6\u884c\u4e3a\u7684\uff0c\u5176\u5b9e\u4e0d\u7136\u3002\u300a<\/span><span style=\"color: #000000;\">Java \u865a\u62df\u673a\u89c4\u8303\u300b\u5bf9\u65b9\u6cd5\u533a\u7684\u7ea6\u675f\u662f\u975e\u5e38\u5bbd\u677e\u7684\uff0c<\/span><span style=\"color: #000000;\">\u63d0\u5230\u8fc7\u53ef\u4ee5\u4e0d\u8981\u6c42\u865a\u62df\u673a\u5728\u65b9\u6cd5\u533a\u4e2d\u5b9e\u73b0\u5783\u573e\u6536\u96c6\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u4e00\u822c\u6765\u8bf4\u8fd9\u4e2a\u533a\u57df\u7684\u56de\u6536\u6548\u679c\u6bd4\u8f83\u96be\u4ee4\u4eba\u6ee1\u610f\uff0c\u5c24\u5176\u662f\u7c7b\u578b\u7684\u5378\u8f7d\uff0c\u6761\u4ef6\u76f8<\/span><span style=\"color: #000000;\">\u5f53\u82db\u523b\u3002\u4f46\u662f\u8fd9\u90e8\u5206\u533a\u57df\u7684\u56de\u6536\u6709\u65f6\u53c8\u786e\u5b9e\u662f\u5fc5\u8981\u7684\u3002 <\/span><\/li>\n<\/ol>\n<blockquote><p><span style=\"color: #0d0016;\">\u65b9\u6cd5\u533a\u7684\u5783\u573e\u6536\u96c6\u4e3b\u8981\u56de\u6536\u4e24\u90e8\u5206\u5185\u5bb9\uff1a\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u4e2d\u5e9f\u5f03\u7684\u5e38\u91cf\u548c\u4e0d\u518d\u4f7f\u7528\u7684\u7c7b\u578b\u3002 <\/span><\/p><\/blockquote>\n<div><span style=\"color: #000000;\"><strong>\u4e0b\u9762\u4e5f\u79f0\u4f5c\u7c7b\u5378\u8f7d <\/strong><\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5224\u5b9a\u4e00\u4e2a\u5e38\u91cf\u662f\u5426\u201c\u5e9f\u5f03\u201d\u8fd8\u662f\u76f8\u5bf9\u7b80\u5355\uff0c\u800c\u8981\u5224\u5b9a\u4e00\u4e2a\u7c7b\u578b\u662f\u5426\u5c5e\u4e8e\u201c\u4e0d\u518d\u88ab\u4f7f\u7528\u7684\u7c7b\u201d\u7684\u6761\u4ef6\u5c31\u6bd4\u8f83\u82db\u523b\u4e86\u3002\u9700\u8981\u540c\u65f6\u6ee1\u8db3\u4e0b\u9762\u4e09\u4e2a\u6761\u4ef6\uff1a <\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u8be5\u7c7b\u6240\u6709\u7684\u5b9e\u4f8b\u90fd\u5df2\u7ecf\u88ab\u56de\u6536\uff0c\u4e5f\u5c31\u662f Java \u5806\u4e2d\u4e0d\u5b58\u5728\u8be5\u7c7b\u53ca\u5176\u4efb\u4f55\u6d3e\u751f\u5b50<\/span><span style=\"color: #000000;\">\u7c7b\u7684\u5b9e\u4f8b\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u52a0\u8f7d\u8be5\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668\u5df2\u7ecf\u88ab\u56de\u6536\uff0c\u8fd9\u4e2a\u6761\u4ef6\u9664\u975e\u662f\u7ecf\u8fc7\u7cbe\u5fc3\u8bbe\u8ba1\u7684\u53ef\u66ff\u6362\u7c7b\u52a0<\/span><span style=\"color: #000000;\">\u8f7d\u5668\u7684\u573a\u666f\uff0c\u5982 OSGi\u3001JSP \u7684\u91cd\u52a0\u8f7d\u7b49\uff0c\u5426\u5219\u901a\u5e38\u662f\u5f88\u96be\u8fbe\u6210\u7684\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u8be5\u7c7b\u5bf9\u5e94<\/span><span style=\"color: #000000;\"><strong>\u7684 java.lang.Class \u5bf9\u8c61\u6ca1\u6709\u5728\u4efb\u4f55\u5730\u65b9\u88ab\u5f15\u7528\uff0c\u65e0\u6cd5\u5728\u4efb\u4f55\u5730\u65b9\u901a<\/strong><\/span><span style=\"color: #000000;\"><strong>\u8fc7\u53cd\u5c04\u8bbf\u95ee\u8be5\u7c7b\u7684\u65b9\u6cd5<\/strong><\/span><span style=\"color: #000000;\">\u3002<\/span><\/li>\n<\/ol>\n<h1 id=\"%E5%9B%9B%E3%80%81%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95%E6%8E%A5%E5%8F%A3\">\u56db\u3001\u672c\u5730\u65b9\u6cd5\u63a5\u53e3<\/h1>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-16\/2023071413581626266a3ee.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"626\" height=\"514\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-16\/2023071413581626266a3ee.png\" alt=\"\" width=\"626\" height=\"514\" \/><\/noscript><\/p>\n<h3 id=\"%C2%A04.1%20%E4%BB%80%E4%B9%88%E6%98%AF%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95\">\u00a0<span style=\"color: #000000;\"><strong>4.1 \u4ec0\u4e48\u662f\u672c\u5730\u65b9\u6cd5<\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u7b80\u5355\u6765\u8bb2\uff0c<\/span> <span style=\"color: #000000;\"><strong>\u4e00\u4e2a Native Method \u5c31\u662f\u4e00\u4e2a java \u8c03\u7528\u975e java \u4ee3\u7801\u7684\u63a5\u53e3<\/strong><\/span> <span style=\"color: #000000;\">\uff0c\u4e00\u4e2aNative Method \u662f\u8fd9\u6837\u4e00\u4e2a java \u65b9\u6cd5\uff1a\u8be5\u65b9\u6cd5\u7684\u5e95\u5c42\u5b9e\u73b0\u7531\u975e Java \u8bed\u8a00\u5b9e\u73b0\uff0c\u6bd4\u5982 C\u3002\u8fd9\u4e2a\u7279\u5f81\u5e76\u975e java \u7279\u6709\uff0c\u5f88\u591a\u5176\u4ed6\u7684\u7f16\u7a0b\u8bed\u8a00\u90fd\u6709\u8fd9\u4e00\u673a\u5236\u5728\u5b9a\u4e49\u4e00\u4e2a native method \u65f6\uff0c\u5e76\u4e0d\u63d0\u4f9b\u5b9e\u73b0\u4f53\uff08\u6709\u4e9b\u50cf\u5b9a\u4e49\u4e00\u4e2a Java interface\uff09\uff0c\u56e0\u4e3a\u5176\u5b9e\u73b0\u4f53\u662f\u7531\u975e java \u8bed\u8a00\u5728\u5916\u9762\u5b9e\u73b0\u7684\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5173\u952e\u5b57 native \u53ef\u4ee5\u4e0e\u5176\u4ed6\u6240\u6709\u7684 java \u6807\u8bc6\u7b26\u8fde\u7528\uff0c\u4f46\u662f abstract \u9664\u5916\u3002<\/span><\/div>\n<div><\/div>\n<h3 id=\"4.2%20%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E4%BD%BF%E7%94%A8%20Native%20Method\"><span style=\"color: #000000;\"><strong>4.2 \u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528 Native Method <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 Java \u4f7f\u7528\u8d77\u6765\u975e\u5e38\u65b9\u4fbf\uff0c\u7136\u800c\u6709\u4e9b\u5c42\u6b21\u7684\u4efb\u52a1\u7528 java \u5b9e\u73b0\u8d77\u6765\u4e0d\u5bb9\u6613\uff0c\u6216\u8005\u6211\u4eec\u5bf9\u7a0b\u5e8f\u7684\u6548\u7387\u5f88\u5728\u610f\u65f6\uff0c\u95ee\u9898\u5c31\u6765\u4e86\u3002 <\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u4e0e java \u73af\u5883\u5916\u4ea4\u4e92\u3002<\/span><br \/>\n<span style=\"color: #000000;\">\u6709\u65f6 java \u5e94\u7528\u9700\u8981\u4e0e java \u5916\u9762\u7684\u73af\u5883\u4ea4\u4e92\uff0c\u8fd9\u662f\u672c\u5730\u65b9\u6cd5\u5b58\u5728\u7684\u4e3b\u8981\u539f\u56e0\u3002 \u4f60\u53ef\u4ee5\u60f3\u60f3 java \u9700\u8981\u4e0e\u4e00\u4e9b\u5e95\u5c42\u7cfb\u7edf\uff0c\u5982\u67d0\u4e9b\u786c\u4ef6\u4ea4\u6362\u4fe1\u606f\u65f6\u7684\u60c5\u51b5\u3002\u672c\u5730\u65b9\u6cd5\u6b63\u5f0f\u8fd9\u6837\u7684\u4e00\u79cd\u4ea4\u6d41\u673a\u5236\uff1a\u5b83\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u4e00\u4e2a\u975e\u5e38\u7b80\u6d01\u7684\u63a5\u53e3\uff0c\u800c\u4e14\u6211\u4eec\u65e0\u9700\u53bb\u4e86\u89e3 java \u5e94\u7528\u4e4b\u5916\u7684\u7e41\u7410\u7ec6\u8282\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">Sun \u7684\u89e3\u91ca\u5668\u662f\u7528 C \u5b9e\u73b0\u7684\uff0c\u8fd9\u4f7f\u5f97\u5b83\u80fd\u50cf\u4e00\u4e9b\u666e\u901a\u7684 C \u4e00\u6837\u4e0e\u5916\u90e8\u4ea4\u4e92\u3002<\/span><br \/>\n<span style=\"color: #000000;\">jre\u5927\u90e8\u5206\u662f\u7528 java \u5b9e\u73b0\u7684\uff0c\u5b83\u4e5f\u901a\u8fc7\u4e00\u4e9b\u672c\u5730\u65b9\u6cd5\u4e0e\u5916\u754c\u4ea4\u4e92\u3002\u4f8b\u5982\uff1a\u7c7b java.lang.Thread \u7684 setPriority()\u65b9\u6cd5\u662f\u7528 Java \u5b9e\u73b0\u7684\uff0c\u4f46\u662f\u5b83\u5b9e\u73b0\u8c03\u7528\u7684\u662f\u8be5\u7c7b\u91cc\u7684\u672c\u5730\u65b9\u6cd5 setPriority0\uff08\uff09\u3002<\/span><\/li>\n<\/ol>\n<hr \/>\n<h1 id=\"%E4%BA%94%E3%80%81%E6%89%A7%E8%A1%8C%E5%BC%95%E6%93%8E\">\u4e94\u3001\u6267\u884c\u5f15\u64ce<\/h1>\n<h3 id=\"5.1%20%E6%A6%82%E8%BF%B0\"><span style=\"color: #000000;\"><strong>5.1 \u6982\u8ff0<\/strong><\/span><\/h3>\n<ol>\n<li><span style=\"color: #000000;\">\u6267\u884c\u5f15\u64ce\u662f Java \u865a\u62df\u673a\u6838\u5fc3\u7684\u7ec4\u6210\u90e8\u5206\u4e4b\u4e00\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">JVM \u7684\u4e3b\u8981\u4efb\u52a1\u662f\u8d1f\u8d23\u88c5\u8f7d\u5b57\u8282\u7801\u5230\u5176\u5185\u90e8\uff0c\u4f46\u5b57\u8282\u7801\u5e76\u4e0d\u80fd\u591f\u76f4\u63a5\u8fd0\u884c\u5728\u64cd\u4f5c\u7cfb\u7edf\u4e4b\u4e0a\uff0c\u56e0\u4e3a\u5b57\u8282\u7801\u6307\u4ee4\u5e76\u975e\u7b49\u4ef7\u4e8e\u672c\u5730\u673a\u5668\u6307\u4ee4\uff0c\u5b83\u5185\u90e8\u5305\u542b\u7684\u4ec5\u4ec5\u53ea\u662f\u4e00\u4e9b\u80fd\u591f\u88ab JVM \u6240\u8bc6\u522b\u7684\u5b57\u8282\u7801\u6307\u4ee4\u3001\u7b26\u53f7\u8868\uff0c\u4ee5\u53ca\u5176\u4ed6\u8f85\u52a9\u4fe1\u606f\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u90a3\u4e48\uff0c\u5982\u679c\u60f3\u8981\u8ba9\u4e00\u4e2a Java \u7a0b\u5e8f\u8fd0\u884c\u8d77\u6765\uff0c\u6267\u884c\u5f15\u64ce\uff08Execution Engine\uff09<\/span><span style=\"color: #000000;\">\u7684\u4efb\u52a1\u5c31\u662f\u5c06\u5b57\u8282\u7801\u6307\u4ee4<\/span><span style=\"color: #000000;\"><strong>\u89e3\u91ca\/\u7f16\u8bd1<\/strong><\/span><span style=\"color: #000000;\">\u4e3a\u5bf9\u5e94\u5e73\u53f0\u4e0a\u7684\u672c\u5730\u673a\u5668\u6307\u4ee4\u624d\u53ef\u4ee5\u3002\u7b80\u5355\u6765\u8bf4\uff0cJVM \u4e2d\u7684\u6267\u884c\u5f15\u64ce\u5145\u5f53\u4e86\u5c06\u9ad8\u7ea7\u8bed\u8a00\u7ffb\u8bd1\u4e3a\u673a\u5668\u8bed\u8a00\u7684\u8bd1\u8005\u3002 <\/span><\/li>\n<\/ol>\n<div><span style=\"color: #000000;\"><strong>\u6ce8\u610f\u533a\u5206\u6982\u5ff5: <\/strong><\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u524d\u7aef\u7f16\u8bd1\uff1a\u4ece Java \u7a0b\u5e8f\u5458-\u5b57\u8282\u7801\u6587\u4ef6\u7684\u8fd9\u4e2a\u8fc7\u7a0b\u53eb\u524d\u7aef\u7f16\u8bd1. <\/span><\/li>\n<li><span style=\"color: #000000;\">\u6267\u884c\u5f15\u64ce\u8fd9\u91cc\u6709\u4e24\u79cd\u884c\u4e3a\uff1a\u4e00\u79cd\u662f\u89e3\u91ca\u6267\u884c\uff0c\u4e00\u79cd\u662f\u7f16\u8bd1\u6267\u884c\uff08\u8fd9\u91cc\u7684\u662f\u540e\u7aef<\/span><span style=\"color: #000000;\">\u7f16\u8bd1\uff09\u3002<\/span><\/li>\n<\/ol>\n<h3 id=\"5.2%20%E4%BB%80%E4%B9%88%E6%98%AF%E8%A7%A3%E9%87%8A%E5%99%A8%EF%BC%9F%E4%BB%80%E4%B9%88%E6%98%AF%20JIT%20%E7%BC%96%E8%AF%91%E5%99%A8%EF%BC%9F\"><span style=\"color: #000000;\"><strong>5.2 \u4ec0\u4e48\u662f\u89e3\u91ca\u5668\uff1f\u4ec0\u4e48\u662f JIT \u7f16\u8bd1\u5668\uff1f <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\"><strong>\u89e3\u91ca\u5668\uff1a<\/strong><\/span> <span style=\"color: #000000;\">\u5f53 Java \u865a\u62df\u673a\u542f\u52a8\u65f6\u4f1a\u6839\u636e\u9884\u5b9a\u4e49\u7684\u89c4\u8303\u5bf9\u5b57\u8282\u7801\u91c7\u7528\u9010\u884c\u89e3\u91ca\u7684\u65b9\u5f0f\u6267\u884c\uff0c\u5c06\u6bcf\u6761\u5b57<\/span><\/div>\n<div><span style=\"color: #000000;\">\u8282\u7801\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\u201c\u7ffb\u8bd1\u201d\u4e3a\u5bf9\u5e94\u5e73\u53f0\u7684\u672c\u5730\u673a\u5668\u6307\u4ee4\u6267\u884c\u3002 <\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>JIT\uff08Just In Time Compiler\uff09\u7f16\u8bd1\u5668\uff1a<\/strong><\/span> <span style=\"color: #000000;\">\u5c31\u662f\u865a\u62df\u673a\u5c06\u6e90\u4ee3\u7801\u4e00\u6b21\u6027\u76f4\u63a5\u7f16\u8bd1\u6210\u548c\u672c\u5730\u673a\u5668\u5e73\u53f0\u76f8\u5173\u7684\u673a\u5668\u8bed\u8a00\uff0c\u4f46\u5e76\u4e0d\u662f\u9a6c\u4e0a\u6267\u884c\u3002<\/span><\/div>\n<h3 id=\"5.3%20%E4%B8%BA%E4%BB%80%E4%B9%88%20Java%20%E6%98%AF%E5%8D%8A%E7%BC%96%E8%AF%91%E5%8D%8A%E8%A7%A3%E9%87%8A%E5%9E%8B%E8%AF%AD%E8%A8%80%EF%BC%9F\"><span style=\"color: #000000;\"><strong>5.3 \u4e3a\u4ec0\u4e48 Java \u662f\u534a\u7f16\u8bd1\u534a\u89e3\u91ca\u578b\u8bed\u8a00\uff1f<\/strong><\/span><\/h3>\n<div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u8d77\u521d\u5c06 Java \u8bed\u8a00\u5b9a\u4f4d\u4e3a\u201c\u89e3\u91ca\u6267\u884c\u201d\u8fd8\u662f\u6bd4\u8f83\u51c6\u786e\u7684\u3002\u518d\u540e\u6765\uff0cJava \u4e5f\u53d1\u5c55\u51fa\u53ef\u4ee5\u76f4\u63a5\u751f\u6210\u672c\u5730\u4ee3\u7801\u7684\u7f16\u8bd1\u5668\u3002\u73b0\u5728 JVM \u5728\u6267\u884c Java \u4ee3\u7801\u7684\u65f6\u5019\uff0c\u901a\u5e38\u90fd\u4f1a\u5c06\u89e3\u91ca\u6267\u884c\u4e0e\u7f16\u8bd1\u6267\u884c\u4e8c\u8005\u7ed3\u5408\u8d77\u6765\u8fdb\u884c\u3002 <\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>\u539f\u56e0: <\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0JVM \u8bbe\u8ba1\u8005\u4eec\u7684\u521d\u8877\u4ec5\u4ec5\u53ea\u662f\u5355\u7eaf\u5730\u4e3a\u4e86\u6ee1\u8db3 Java \u7a0b\u5e8f\u5b9e\u73b0\u8de8\u5e73\u53f0\u7279\u6027\uff0c\u56e0\u6b64\u907f\u514d\u91c7\u7528\u9759\u6001\u7f16\u8bd1\u7684\u65b9\u5f0f\u7531\u9ad8\u7ea7\u8bed\u8a00\u76f4\u63a5\u751f\u6210\u672c\u5730\u673a\u5668\u6307\u4ee4\uff0c\u4ece\u800c\u8bde\u751f\u4e86\u5b9e\u73b0\u89e3\u91ca\u5668\u5728\u8fd0\u884c\u65f6\u91c7\u7528\u9010\u884c\u89e3\u91ca\u5b57\u8282\u7801\u6267\u884c\u7a0b\u5e8f\u7684\u60f3\u6cd5\u3002<\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u89e3\u91ca\u5668\u771f\u6b63\u610f\u4e49\u4e0a\u6240\u627f\u62c5\u7684\u89d2\u8272\u5c31\u662f\u4e00\u4e2a\u8fd0\u884c\u65f6\u201c\u7ffb\u8bd1\u8005\u201d\uff0c\u5c06\u5b57\u8282\u7801\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\u201c\u7ffb\u8bd1\u201d\u4e3a\u5bf9\u5e94\u5e73\u53f0\u7684\u672c\u5730\u673a\u5668\u6307\u4ee4\u6267\u884c,\u6267\u884c\u6548\u7387\u4f4e\u3002 <\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0JIT \u7f16\u8bd1\u5668\u5c06\u5b57\u8282\u7801\u7ffb\u8bd1\u6210\u672c\u5730\u4ee3\u7801\u540e\uff0c\u5c31\u53ef\u4ee5\u505a\u4e00\u4e2a\u7f13\u5b58\u64cd\u4f5c\uff0c\u5b58\u50a8\u5728\u65b9\u6cd5\u533a\u7684 JIT \u4ee3\u7801\u7f13\u5b58\u4e2d\uff08\u6267\u884c\u6548\u7387\u66f4\u9ad8\u4e86\uff09\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u662f\u5426\u9700\u8981\u542f\u52a8 JIT \u7f16\u8bd1\u5668\u5c06\u5b57\u8282\u7801\u76f4\u63a5\u7f16\u8bd1\u4e3a\u5bf9\u5e94\u5e73\u53f0\u7684\u672c\u5730\u673a\u5668\u6307\u4ee4\uff0c\u5219\u9700\u8981\u6839\u636e\u4ee3\u7801\u88ab\u8c03\u7528\u6267\u884c\u7684\u9891\u7387\u800c\u5b9a\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0JIT \u7f16\u8bd1\u5668\u5728\u8fd0\u884c\u65f6\u4f1a\u9488\u5bf9\u90a3\u4e9b\u9891\u7e41\u88ab\u8c03\u7528\u7684\u201c\u70ed\u70b9\u4ee3\u7801\u201d\u505a\u51fa\u6df1\u5ea6\u4f18\u5316\uff0c\u5c06\u5176\u76f4\u63a5\u7f16\u8bd1\u4e3a\u5bf9\u5e94\u5e73\u53f0\u7684\u672c\u5730\u673a\u5668\u6307\u4ee4\uff0c\u4ee5\u6b64\u63d0\u5347 Java \u7a0b\u5e8f\u7684\u6267\u884c\u6027\u80fd\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4e00\u4e2a\u88ab\u591a\u6b21\u8c03\u7528\u7684\u65b9\u6cd5\uff0c\u6216\u8005\u662f\u4e00-\u4e2a\u65b9\u6cd5\u4f53\u5185\u90e8\u5faa\u73af\u6b21\u6570\u8f83\u591a\u7684\u5faa\u73af\u4f53\u90fd\u53ef\u4ee5\u88ab\u79f0\u4e4b\u4e3a\u201c\u70ed\u70b9\u4ee3\u7801\u201d\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u76ee\u524d HotSpot VM \u6240\u91c7\u7528\u7684\u70ed\u70b9\u63a2\u6d4b\u65b9\u5f0f\u662f\u57fa\u4e8e\u8ba1\u6570\u5668\u7684\u70ed\u70b9\u63a2\u6d4b\u3002 <\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>JIT \u7f16\u8bd1\u5668\u6267\u884c\u6548\u7387\u9ad8\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981\u89e3\u91ca\u5668\uff1f <\/strong><\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u5f53\u7a0b\u5e8f\u542f\u52a8\u540e\uff0c\u89e3\u91ca\u5668\u53ef\u4ee5\u9a6c\u4e0a\u53d1\u6325\u4f5c\u7528\uff0c\u54cd\u5e94\u901f\u5ea6\u5feb\uff0c\u7701\u53bb\u7f16\u8bd1\u7684\u65f6\u95f4\uff0c\u7acb<\/span><span style=\"color: #000000;\">\u5373\u6267\u884c\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u7f16\u8bd1\u5668\u8981\u60f3\u53d1\u6325\u4f5c\u7528\uff0c\u628a\u4ee3\u7801\u7f16\u8bd1\u6210\u672c\u5730\u4ee3\u7801\uff0c\u9700\u8981\u4e00\u5b9a\u7684\u6267\u884c\u65f6\u95f4\uff0c\u4f46\u7f16\u8bd1<\/span><span style=\"color: #000000;\">\u4e3a\u672c\u5730\u4ee3\u7801\u540e\uff0c\u6267\u884c\u6548\u7387\u9ad8\u3002\u5c31\u9700\u8981\u91c7\u7528\u89e3\u91ca\u5668\u4e0e\u5373\u65f6\u7f16\u8bd1\u5668\u5e76\u5b58\u7684\u67b6\u6784\u6765\u6362\u53d6<\/span><span style=\"color: #000000;\">\u4e00\u4e2a\u5e73\u8861\u70b9\u3002<\/span><\/li>\n<\/ol>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<hr \/>\n<h1 id=\"%E5%85%AD%E3%80%81%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6\">\u516d\u3001\u5783\u573e\u56de\u6536<\/h1>\n<h2 id=\"6.1%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E6%A6%82%E8%BF%B0\"><span style=\"color: #000000;\"><strong>6.1 \u5783\u573e\u56de\u6536\u6982\u8ff0<\/strong><\/span><\/h2>\n<h3 id=\"6.1.1%20%E6%A6%82%E8%BF%B0\"><span style=\"color: #000000;\"><strong>6.1.1 \u6982\u8ff0<\/strong><\/span><\/h3>\n<ol>\n<li><span style=\"color: #000000;\">Java \u548c C++\u8bed\u8a00\u7684\u533a\u522b\uff0c\u5c31\u5728\u4e8e\u5783\u573e\u6536\u96c6\u6280\u672f\u548c\u5185\u5b58\u52a8\u6001\u5206\u914d\u4e0a\uff0cC++\u8bed\u8a00\u6ca1\u6709\u5783\u573e\u6536\u96c6\u6280\u672f\uff0c\u9700\u8981\u7a0b\u5e8f\u5458\u624b\u52a8\u7684\u6536\u96c6\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5783\u573e\u6536\u96c6\uff0c\u4e0d\u662f Java \u8bed\u8a00\u7684\u4f34\u751f\u4ea7\u7269\u3002\u65e9\u5728 1960 \u5e74\uff0c\u7b2c\u4e00\u95e8\u5f00\u59cb\u4f7f\u7528\u5185\u5b58\u52a8\u6001\u5206\u914d\u548c\u5783\u573e\u6536\u96c6\u6280\u672f\u7684 Lisp \u8bed\u8a00\u8bde\u751f\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5173\u4e8e\u5783\u573e\u6536\u96c6\u6709\u4e09\u4e2a\u7ecf\u5178\u95ee\u9898\uff1a <\/span><br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u54ea\u4e9b\u5185\u5b58\u9700\u8981\u56de\u6536\uff1f <\/span><br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4ec0\u4e48\u65f6\u5019\u56de\u6536\uff1f <\/span><br \/>\n<span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5982\u4f55\u56de\u6536\uff1f <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5783\u573e\u6536\u96c6\u673a\u5236\u662f Java \u7684\u62db\u724c\u80fd\u529b\uff0c\u6781\u5927\u5730\u63d0\u9ad8\u4e86\u5f00\u53d1\u6548\u7387\u3002\u5982\u4eca\uff0c\u5783\u573e\u6536\u96c6\u51e0\u4e4e\u6210\u4e3a\u73b0\u4ee3\u8bed\u8a00\u7684\u6807\u914d\uff0c\u5373\u4f7f\u7ecf\u8fc7\u5982\u6b64\u957f\u65f6\u95f4\u7684\u53d1\u5c55\uff0cJava \u7684\u5783\u573e\u6536\u96c6\u673a\u5236\u4ecd\u7136\u5728\u4e0d\u65ad\u7684\u6f14\u8fdb\u4e2d\uff0c\u4e0d\u540c\u5927\u5c0f\u7684\u8bbe\u5907\u3001\u4e0d\u540c\u7279\u5f81\u7684\u5e94\u7528\u573a\u666f\uff0c\u5bf9\u5783\u573e\u6536\u96c6\u63d0\u51fa\u4e86\u65b0\u7684\u6311\u6218\u3002<\/span><\/li>\n<\/ol>\n<h3><\/h3>\n<h3 id=\"6.1.2%20%E4%BB%80%E4%B9%88%E6%98%AF%E5%9E%83%E5%9C%BE%EF%BC%9F\"><span style=\"color: #000000;\"><strong>6.1.2 \u4ec0\u4e48\u662f\u5783\u573e\uff1f<\/strong><\/span><\/h3>\n<ul>\n<li><span style=\"color: #000000;\">\u5783\u573e\u662f\u6307\u5728<\/span><span style=\"color: #000000;\"><strong>\u8fd0\u884c\u7a0b\u5e8f\u4e2d\u6ca1\u6709\u4efb\u4f55\u5f15\u7528\u6307\u5411\u7684\u5bf9\u8c61<\/strong><\/span><span style=\"color: #000000;\">\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5c31\u662f\u9700\u8981\u88ab\u56de\u6536\u7684\u5783\u573e\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5982\u679c\u4e0d\u53ca\u65f6\u5bf9\u5185\u5b58\u4e2d\u7684\u5783\u573e\u8fdb\u884c\u6e05\u7406\uff0c\u90a3\u4e48\uff0c\u8fd9\u4e9b\u5783\u573e\u5bf9\u8c61\u6240\u5360\u7684\u5185\u5b58\u7a7a\u95f4\u4f1a\u4e00\u76f4\u4fdd\u7559\u5230\u5e94\u7528\u7a0b\u5e8f\u7ed3\u675f\uff0c\u88ab\u4fdd\u7559\u7684\u7a7a\u95f4\u65e0\u6cd5\u88ab\u5176\u4ed6\u5bf9\u8c61\u4f7f\u7528\u3002\u751a\u81f3\u53ef\u80fd<strong>\u5bfc\u81f4\u5185\u5b58<\/strong><\/span><span style=\"color: #000000;\"><strong>\u6ea2\u51fa<\/strong><\/span><span style=\"color: #000000;\">\u3002<\/span><\/li>\n<\/ul>\n<div><\/div>\n<h3 id=\"6.1.3%20%E4%B8%BA%E4%BB%80%E4%B9%88%E9%9C%80%E8%A6%81%20GC%EF%BC%9F\"><span style=\"color: #000000;\"><strong>6.1.3 \u4e3a\u4ec0\u4e48\u9700\u8981 GC\uff1f <\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\"><strong>\u60f3\u8981\u5b66\u4e60 GC\uff0c\u9996\u5148\u9700\u8981\u7406\u89e3\u4e3a\u4ec0\u4e48\u9700\u8981 GC\uff1f <\/strong><\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u5bf9\u4e8e\u9ad8\u7ea7\u8bed\u8a00\u6765\u8bf4\uff0c\u4e00\u4e2a\u57fa\u672c\u8ba4\u77e5\u662f\u5982\u679c\u4e0d\u8fdb\u884c\u5783\u573e\u56de\u6536\uff0c<strong>\u5185\u5b58\u8fdf\u65e9\u90fd\u4f1a<\/strong><\/span><span style=\"color: #000000;\"><strong>\u88ab\u6d88\u8017\u5b8c<\/strong><\/span><span style=\"color: #000000;\">\uff0c\u56e0\u4e3a\u4e0d\u65ad\u5730\u5206\u914d\u5185\u5b58\u7a7a\u95f4\u800c\u4e0d\u8fdb\u884c\u56de\u6536\uff0c\u5c31\u597d\u50cf\u4e0d\u505c\u5730\u751f\u4ea7\u751f\u6d3b\u5783\u573e\u800c\u4ece\u6765\u4e0d\u6253\u626b\u4e00\u6837\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u9664\u4e86\u91ca\u653e\u6ca1\u7528\u7684\u5bf9\u8c61\uff0c\u5783\u573e\u56de\u6536\u4e5f\u53ef\u4ee5\u6e05\u9664\u5185\u5b58\u91cc\u7684\u8bb0\u5f55\u788e\u7247\u3002\u788e\u7247\u6574\u7406\u5c06\u6240\u5360\u7528\u7684\u5806\u5185\u5b58\u79fb\u5230\u5806\u7684\u4e00\u7aef\uff0c<strong>\u4ee5\u4fbf JVM \u5c06\u6574\u7406\u51fa\u7684\u5185\u5b58\u5206\u914d\u7ed9\u65b0\u7684\u5bf9\u8c61\u3002<\/strong><\/span><\/li>\n<\/ol>\n<h3 id=\"6.1.4%20%E6%97%A9%E6%9C%9F%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6\"><span style=\"color: #000000;\"><strong>6.1.4 \u65e9\u671f\u5783\u573e\u56de\u6536<\/strong><\/span><\/h3>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u5728\u65e9\u671f\u7684 C\/C++\u65f6\u4ee3\uff0c\u5783\u573e\u56de\u6536\u57fa\u672c\u4e0a\u662f\u624b\u5de5\u8fdb\u884c\u7684\u3002\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u4f7f\u7528 new\u5173\u952e\u5b57\u8fdb\u884c\u5185\u5b58\u7533\u8bf7\uff0c\u5e76\u4f7f\u7528 delete \u5173\u952e\u5b57\u8fdb\u884c\u5185\u5b58\u91ca\u653e\u3002\u6bd4\u5982\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/span><\/div>\n<pre><code class=\"language-cpp\">MibBridge *pBridge= new cmBaseGroupBridge\uff08\uff09\uff1b\n\/\/\u5982\u679c\u6ce8\u518c\u5931\u8d25\uff0c\u4f7f\u7528 Delete \u91ca\u653e\u8be5\u5bf9\u8c61\u6240\u5360\u5185\u5b58\u533a\u57df\nif\uff08pBridge-&gt;Register\uff08kDestroy\uff09\uff01=NO ERROR\uff09\ndelete pBridge\uff1b<\/code><\/pre>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u7075\u6d3b\u63a7\u5236\u5185\u5b58\u91ca\u653e\u7684\u65f6\u95f4\uff0c\u4f46\u662f\u4f1a\u7ed9\u5f00\u53d1\u4eba\u5458\u5e26\u6765\u9891\u7e41\u7533\u8bf7\u548c\u91ca\u653e\u5185\u5b58\u7684\u7ba1\u7406\u8d1f\u62c5\u3002\u5018\u82e5\u6709\u4e00\u5904\u5185\u5b58\u533a\u95f4\u7531\u4e8e\u7a0b\u5e8f\u5458\u7f16\u7801\u7684\u95ee\u9898\u5fd8\u8bb0\u88ab\u56de\u6536\uff0c\u90a3\u4e48\u5c31\u4f1a\u4ea7\u751f<strong>\u5185\u5b58\u6cc4\u6f0f<\/strong><\/span> <span style=\"color: #000000;\">\uff0c\u5783\u573e\u5bf9\u8c61\u6c38\u8fdc\u65e0\u6cd5\u88ab\u6e05\u9664\uff0c\u968f\u7740\u7cfb\u7edf\u8fd0\u884c\u65f6\u95f4\u7684\u4e0d\u65ad\u589e\u957f\uff0c\u5783\u573e\u5bf9\u8c61\u6240\u8017\u5185\u5b58\u53ef\u80fd\u6301\u7eed\u4e0a\u5347\uff0c\u76f4\u5230\u51fa\u73b0\u5185\u5b58\u6ea2\u51fa\u5e76\u9020\u6210\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u6709\u4e86\u5783\u573e\u56de\u6536\u673a\u5236\u540e\uff0c\u4e0a\u8ff0\u4ee3\u7801\u6781\u6709\u53ef\u80fd\u53d8\u6210\u8fd9\u6837<\/span><\/div>\n<div>\n<pre><code class=\"language-cpp\">MibBridge *pBridge=new cmBaseGroupBridge();\npBridge-&gt;Register(kDestroy);<\/code><\/pre>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u73b0\u5728\uff0c\u9664\u4e86 Java \u4ee5\u5916\uff0cC#\u3001Python\u3001Ruby \u7b49\u8bed\u8a00\u90fd\u4f7f\u7528\u4e86\u81ea\u52a8\u5783\u573e\u56de\u6536\u7684\u601d<\/span> <span style=\"color: #000000;\">\u60f3\uff0c\u4e5f\u662f\u672a\u6765\u53d1\u5c55\u8d8b\u52bf\uff0c\u53ef\u4ee5\u8bf4\u8fd9\u79cd\u81ea\u52a8\u5316\u7684\u5185\u5b58\u5206\u914d\u548c\u6765\u53ca\u56de\u6536\u65b9\u5f0f\u5df2\u7ecf\u6210\u4e3a\u4e86\u73b0\u4ee3\u5f00\u53d1\u8bed\u8a00\u5fc5\u5907\u7684\u6807\u51c6\u3002<\/span><\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<h3 id=\"6.1.5Java%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E6%9C%BA%E5%88%B6\"><span style=\"color: #000000;\"><strong>6.1.5Java \u5783\u573e\u56de\u6536\u673a\u5236<\/strong><\/span><\/h3>\n<div>\n<div><span style=\"color: #000000;\"><strong>6.1.5.1 \u81ea\u52a8\u5185\u5b58\u7ba1\u7406 <\/strong><\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\">\u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u7684\u4f18\u70b9 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u81ea\u52a8\u5185\u5b58\u7ba1\u7406\uff0c\u65e0\u9700\u5f00\u53d1\u4eba\u5458\u624b\u52a8\u53c2\u4e0e\u5185\u5b58\u7684\u5206\u914d\u4e0e\u56de\u6536\uff0c\u8fd9\u6837<\/span> <span style=\"color: #000000;\"><strong>\u964d\u4f4e\u5185\u5b58\u6cc4\u6f0f<\/strong><\/span> <span style=\"color: #494949;\"><strong>\u548c<\/strong><\/span> <span style=\"color: #000000;\"><strong>\u5185\u5b58\u6ea2\u51fa\u7684\u98ce\u9669. <\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u673a\u5236\uff0c\u5c06\u7a0b\u5e8f\u5458\u4ece\u7e41\u91cd\u7684\u5185\u5b58\u7ba1\u7406\u4e2d\u91ca\u653e\u51fa\u6765\uff0c\u53ef\u4ee5<\/span> <span style=\"color: #000000;\"><strong>\u66f4\u4e13\u5fc3\u5730\u4e13\u6ce8<\/strong><\/span> <span style=\"color: #000000;\"><strong>\u4e8e\u4e1a\u52a1\u5f00\u53d1. <\/strong><\/span><\/div>\n<div><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>6.1.5.2 \u5173\u4e8e\u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u7684\u62c5\u5fe7 <\/strong><\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a01.\u5bf9\u4e8e Java \u5f00\u53d1\u4eba\u5458\u800c\u8a00\uff0c\u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u5c31\u50cf\u662f\u4e00\u4e2a\u9ed1\u5323\u5b50\uff0c\u5982\u679c\u8fc7\u5ea6\u4f9d\u8d56\u4e8e\u201c\u81ea\u52a8\u201d\uff0c\u90a3\u4e48\u8fd9\u5c06\u4f1a\u662f\u4e00\u573a\u707e\u96be\uff0c\u6700\u4e25\u91cd\u7684\u5c31<strong>\u4f1a\u5f31\u5316 Java \u5f00\u53d1\u4eba\u5458\u5728\u7a0b\u5e8f\u51fa<\/strong><\/span> <span style=\"color: #000000;\"><strong>\u73b0\u5185\u5b58\u6ea2\u51fa\u65f6\u5b9a\u4f4d\u95ee\u9898\u548c\u89e3\u51b3\u95ee\u9898\u7684\u80fd\u529b\u3002 <\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a02.\u6b64\u65f6\uff0c\u4e86\u89e3 JVM \u7684\u81ea\u52a8\u5185\u5b58\u5206\u914d\u548c\u5185\u5b58\u56de\u6536\u539f\u7406\u5c31\u663e\u5f97\u975e\u5e38\u91cd\u8981\uff0c\u53ea\u6709\u5728\u771f\u6b63\u4e86\u89e3 JVM \u662f\u5982\u4f55\u7ba1\u7406\u5185\u5b58\u540e\uff0c\u6211\u4eec\u624d\u80fd\u591f\u5728\u9047\u89c1 OutofMemoryError \u65f6\uff0c\u5feb\u901f\u5730\u6839\u636e\u9519\u8bef\u5f02\u5e38\u65e5\u5fd7\u5b9a\u4f4d\u95ee\u9898\u548c\u89e3\u51b3\u95ee\u9898\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a03.\u5f53\u9700\u8981\u6392\u67e5\u5404\u79cd\u5185\u5b58\u6ea2\u51fa\u3001\u5185\u5b58\u6cc4\u6f0f\u95ee\u9898\u65f6\uff0c\u5f53\u5783\u573e\u6536\u96c6\u6210\u4e3a\u7cfb\u7edf\u8fbe\u5230\u66f4\u9ad8\u5e76\u53d1\u91cf\u7684\u74f6\u9888\u65f6\uff0c\u6211\u4eec\u5c31\u5fc5\u987b\u5bf9\u8fd9\u4e9b\u201c\u81ea\u52a8\u5316\u201d\u7684\u6280\u672f<strong>\u5b9e\u65bd\u5fc5\u8981\u7684\u76d1\u63a7\u548c\u8c03\u8282<\/strong><\/span> <span style=\"color: #000000;\">\u3002<\/span><\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<div><span style=\"color: #000000;\"><strong>6.1.5.3 \u5e94\u8be5\u5173\u5fc3\u54ea\u4e9b\u533a\u57df\u7684\u56de\u6536\uff1f <\/strong><\/span><\/div>\n<div><\/div>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-17\/20230714135817a2a2a7947.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"461\" height=\"263\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-17\/20230714135817a2a2a7947.png\" alt=\"\" width=\"461\" height=\"263\" \/><\/noscript><\/p>\n<\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u5783\u573e\u6536\u96c6\u5668\u53ef\u4ee5\u5bf9\u5e74\u8f7b\u4ee3\u56de\u6536\uff0c\u4e5f\u53ef\u4ee5\u5bf9\u8001\u5e74\u4ee3\u56de\u6536\uff0c\u751a\u81f3\u662f\u5168\u6808\u548c\u65b9\u6cd5\u533a\u7684\u56de\u6536\uff0c\u5176\u4e2d\uff0c<\/span><\/div>\n<div><span style=\"color: #000000;\">Java \u5806\u662f\u5783\u573e\u6536\u96c6\u5668\u7684\u5de5\u4f5c\u91cd\u70b9 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u4ece\u6b21\u6570\u4e0a\u8bb2\uff1a <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u9891\u7e41\u6536\u96c6 Young \u533a <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u8f83\u5c11\u6536\u96c6 Old \u533a <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u57fa\u672c\u4e0d\u6536\u96c6\u5143\u7a7a\u95f4(\u65b9\u6cd5\u533a)<\/span><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<h2 id=\"6.2%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%9B%B8%E5%85%B3%E7%AE%97%E6%B3%95\"><span style=\"color: #000000;\"><strong>6.2 \u5783\u573e\u56de\u6536\u76f8\u5173\u7b97\u6cd5<\/strong><\/span><\/h2>\n<h3 id=\"6.2.1%20%E5%9E%83%E5%9C%BE%E6%A0%87%E8%AE%B0%E9%98%B6%E6%AE%B5%E7%AE%97%E6%B3%95\"><span style=\"color: #000000;\"><strong>6.2.1 \u5783\u573e\u6807\u8bb0\u9636\u6bb5\u7b97\u6cd5<\/strong><\/span><\/h3>\n<\/div>\n<div>\n<div><span style=\"color: #000000;\"><strong>6.2.1.1 \u6807\u8bb0\u9636\u6bb5\u7684\u76ee\u7684 <\/strong><\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>\u5783\u573e\u6807\u8bb0\u9636\u6bb5\uff1a\u4e3b\u8981\u662f\u4e3a\u4e86\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u662f\u5783\u573e\u5bf9\u8c61 <\/strong><\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u5728\u5806\u91cc\u5b58\u653e\u7740\u51e0\u4e4e\u6240\u6709\u7684 Java \u5bf9\u8c61\u5b9e\u4f8b\uff0c\u5728 GC \u6267\u884c\u5783\u573e\u56de\u6536\u4e4b\u524d\uff0c\u9996\u5148<\/span><span style=\"color: #000000;\"><strong>\u9700<\/strong><\/span><span style=\"color: #000000;\"><strong>\u8981\u533a\u5206\u51fa\u5185\u5b58\u4e2d\u54ea\u4e9b\u662f\u6709\u7528\u5bf9\u8c61\uff0c\u54ea\u4e9b\u662f\u5783\u573e\u5bf9\u8c61<\/strong><\/span><span style=\"color: #000000;\">\u3002\u53ea\u6709\u88ab\u6807\u8bb0\u4e3a\u5df1\u7ecf\u662f<\/span><span style=\"color: #000000;\"><strong>\u5783\u573e\u5bf9<\/strong><\/span><span style=\"color: #000000;\"><strong>\u8c61<\/strong><\/span><span style=\"color: #000000;\">\uff0cGC \u624d\u4f1a\u5728\u6267\u884c\u5783\u573e\u56de\u6536\u65f6\uff0c\u91ca\u653e\u6389\u5176\u6240\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u56e0\u6b64\u8fd9\u4e2a\u8fc7\u7a0b\u6211\u4eec\u53ef\u4ee5\u79f0\u4e3a<strong>\u5783\u573e\u6807\u8bb0\u9636\u6bb5<\/strong><\/span><span style=\"color: #000000;\">\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u90a3\u4e48\u5728 JVM \u4e2d\u7a76\u7adf\u662f\u5982\u4f55\u6807\u8bb0\u4e00\u4e2a<\/span><span style=\"color: #000000;\"><strong>\u5783\u573e\u5bf9\u8c61<\/strong><\/span><span style=\"color: #000000;\">\u5462\uff1f\u7b80\u5355\u6765\u8bf4\uff0c\u5f53\u4e00\u4e2a\u5bf9\u8c61\u5df2\u7ecf\u4e0d\u518d\u88ab\u4efb\u4f55\u5f15\u7528\u6307\u5411\u65f6\uff0c\u5c31\u53ef\u4ee5\u5ba3\u5224\u4e3a<strong>\u5783\u573e\u5bf9\u8c61<\/strong><\/span><span style=\"color: #000000;\">\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u5783\u573e\u5bf9\u8c61\u4e00\u822c\u6709\u4e24\u79cd\u65b9\u5f0f\uff1a<\/span><span style=\"color: #000000;\"><strong>\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\u548c\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5<\/strong><\/span><span style=\"color: #000000;\">\u3002 <\/span><\/li>\n<\/ol>\n<div><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>6.2.1.2 \u5f15\u7528\u8ba1\u6570\u7b97\u6cd5 <\/strong><\/span><\/div>\n<div><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\uff08Reference Counting\uff09\u6bd4\u8f83\u7b80\u5355\uff0c\u5bf9\u6bcf\u4e2a\u5bf9\u8c61\u4fdd\u5b58\u4e00\u4e2a\u6574\u578b\u7684<strong>\u5f15\u7528\u8ba1\u6570\u5668\u5c5e\u6027\u3002\u7528\u4e8e\u8bb0\u5f55\u5bf9\u8c61\u88ab\u5f15\u7528\u7684\u60c5\u51b5\u3002 <\/strong><\/span><\/li>\n<li><span style=\"color: #000000;\">\u5bf9\u4e8e\u4e00\u4e2a\u5bf9\u8c61 A\uff0c\u53ea\u8981\u6709\u4efb\u4f55\u4e00\u4e2a\u5f15\u7528\u6307\u5411\u4e86\u5bf9\u8c61 A\uff0c\u5219\u5bf9\u8c61 A \u7684\u5f15\u7528\u8ba1\u6570\u5668\u5c31\u52a0 1\uff1b\u5f53\u5f15\u7528\u5931\u6548\u65f6\uff0c\u5f15\u7528\u8ba1\u6570\u5668\u5c31\u51cf 1\u3002\u53ea\u8981\u5bf9\u8c61 A \u7684\u5f15\u7528\u8ba1\u6570\u5668\u7684\u503c\u4e3a 0\uff0c\u5373\u8868\u793a\u5bf9\u8c61 A \u4e0d\u53ef\u80fd\u518d\u88ab\u4f7f\u7528\uff0c\u53ef\u8fdb\u884c\u56de\u6536\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u4f18\u70b9\uff1a\u5b9e\u73b0\u7b80\u5355\uff0c\u5783\u573e\u5bf9\u8c61\u4fbf\u4e8e\u8fa8\u8bc6\uff1b\u5224\u5b9a\u6548\u7387\u9ad8\uff0c\u56de\u6536\u6ca1\u6709\u5ef6\u8fdf\u6027\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u7f3a\u70b9\uff1a <\/span><br \/>\n<span style=\"color: #000000;\">1.\u5b83\u9700\u8981\u5355\u72ec\u7684\u5b57\u6bb5\u5b58\u50a8\u8ba1\u6570\u5668\uff0c\u8fd9\u6837\u7684\u505a\u6cd5<\/span><span style=\"color: #000000;\"><strong>\u589e\u52a0\u4e86\u5b58\u50a8\u7a7a\u95f4\u7684\u5f00\u9500\u3002 <\/strong><\/span><br \/>\n<span style=\"color: #000000;\">2.\u6bcf\u6b21\u8d4b\u503c\u90fd\u9700\u8981\u66f4\u65b0\u8ba1\u6570\u5668\uff0c\u4f34\u968f\u7740\u52a0\u6cd5\u548c\u51cf\u6cd5\u64cd\u4f5c\uff0c\u8fd9<\/span><span style=\"color: #000000;\"><strong>\u589e\u52a0\u4e86\u65f6\u95f4\u5f00\u9500\u3002 <\/strong><\/span><br \/>\n<span style=\"color: #000000;\">3.\u5f15\u7528\u8ba1\u6570\u5668\u6709\u4e00\u4e2a\u4e25\u91cd\u7684\u95ee\u9898\uff0c\u5373<\/span><span style=\"color: #000000;\"><strong>\u65e0\u6cd5\u5904\u7406\u5faa\u73af\u5f15\u7528<\/strong><\/span><span style=\"color: #000000;\">\u7684\u60c5\u51b5\u3002\u8fd9\u662f\u4e00\u6761\u81f4\u547d<\/span><span style=\"color: #000000;\">\u7f3a\u9677\uff0c\u5bfc\u81f4\u5728.Java \u7684<\/span><span style=\"color: #000000;\"><strong>\u5783\u573e\u56de\u6536\u5668\u4e2d\u6ca1\u6709\u4f7f\u7528\u8fd9\u7c7b\u7b97\u6cd5<\/strong><\/span><span style=\"color: #000000;\">\u3002<\/span><\/li>\n<\/ol>\n<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-17\/202307141358177e7e4fdc7.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"668\" height=\"296\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-17\/202307141358177e7e4fdc7.png\" alt=\"\" width=\"668\" height=\"296\" \/><\/noscript><\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>6.2.1.3 \u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5 <\/strong><\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5\uff1a\u4e5f\u53ef\u4ee5\u79f0\u4e3a\u6839\u641c\u7d22\u7b97\u6cd5\u3001\u8ffd\u8e2a\u6027\u5783\u573e\u6536\u96c6 <\/strong><\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u76f8\u5bf9\u4e8e\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\u800c\u8a00\uff0c\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5\u4e0d\u4ec5\u540c\u6837\u5177\u5907\u5b9e\u73b0\u7b80\u5355\u548c\u6267\u884c\u9ad8\u6548\u7b49\u7279\u70b9\uff0c\u66f4\u91cd\u8981\u7684\u662f\u8be5\u7b97\u6cd5\u53ef\u4ee5\u6709\u6548\u5730<strong>\u89e3\u51b3\u5728\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\u4e2d\u5faa\u73af\u5f15\u7528\u7684\u95ee\u9898<\/strong><\/span><span style=\"color: #000000;\">\uff0c\u9632\u6b62\u5185\u5b58\u6cc4\u6f0f\u7684\u53d1\u751f\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u76f8\u8f83\u4e8e\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\uff0c\u8fd9\u91cc\u7684\u53ef\u8fbe\u6027\u5206\u6790\u5c31\u662f Java\u3001C#\u9009\u62e9\u7684\u3002\u8fd9\u79cd\u7c7b\u578b\u7684\u5783\u573e\u6536\u96c6\u901a\u5e38\u4e5f\u53eb\u4f5c\u8ffd\u8e2a\u6027\u5783\u573e\u6536\u96c6\uff08Tracing Garbage Collection\uff09 <\/span><\/li>\n<\/ol>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>\u53ef\u8fbe\u6027\u5206\u6790\u5b9e\u73b0\u601d\u8def<\/strong><\/span><\/p>\n<\/div>\n<div><span style=\"color: #000000;\">\u6240\u8c13\"GCRoots\u201d\u6839\u5c31\u662f\u4e00\u7ec4\u5fc5\u987b\u6d3b\u8dc3\u7684\u5f15\u7528 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u5176\u57fa\u672c\u601d\u8def\u5982\u4e0b\uff1a <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a01.\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5\u662f\u4ee5\u6839\uff08GCRoots\uff09\u4e3a\u8d77\u59cb\u70b9\uff0c\u6309\u7167\u4ece\u4e0a\u81f3\u4e0b\u7684\u65b9\u5f0f\u641c\u7d22\u88ab\u6839\u5bf9\u8c61\u6240\u8fde\u63a5\u7684\u76ee\u6807\u5bf9\u8c61\u662f\u5426\u53ef\u8fbe\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a02.\u4f7f\u7528\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5\u540e\uff0c\u5185\u5b58\u4e2d\u7684\u5b58\u6d3b\u5bf9\u8c61\u90fd\u4f1a\u88ab\u6839\u76f4\u63a5\u6216\u95f4\u63a5\u8fde\u63a5\u7740\uff0c\u641c\u7d22\u6240\u8d70\u8fc7\u7684\u8def\u5f84\u79f0\u4e3a\u5f15\u7528\u94fe\uff08Reference Chain\uff09<\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a03.\u5982\u679c\u76ee\u6807\u5bf9\u8c61\u6ca1\u6709\u4efb\u4f55\u5f15\u7528\u94fe\u76f8\u8fde\uff0c\u5219\u662f\u4e0d\u53ef\u8fbe\u7684\uff0c\u5c31\u610f\u5473\u7740\u8be5\u5bf9\u8c61\u5df1\u7ecf\u6b7b\u4ea1\uff0c\u53ef\u4ee5\u6807\u8bb0\u4e3a\u5783\u573e\u5bf9\u8c61\u3002<\/span><\/div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-18\/20230714135818efefea4f1.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"418\" height=\"271\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-18\/20230714135818efefea4f1.png\" alt=\"\" width=\"418\" height=\"271\" \/><\/noscript><\/p>\n<div><span style=\"color: #000000;\"><strong>GC Roots \u53ef\u4ee5\u662f\u54ea\u4e9b\u5143\u7d20\uff1f <\/strong><\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u865a\u62df\u673a\u6808\u4e2d\u5f15\u7528\u7684\u5bf9\u8c61 <\/span><br \/>\n<span style=\"color: #000000;\">\u6bd4\u5982\uff1a\u5404\u4e2a\u7ebf\u7a0b\u88ab\u8c03\u7528\u7684\u65b9\u6cd5\u4e2d\u4f7f\u7528\u5230\u7684\u53c2\u6570\u3001\u5c40\u90e8\u53d8\u91cf\u7b49\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u65b9\u6cd5\u533a\u4e2d\u7c7b\u9759\u6001\u5c5e\u6027\u5f15\u7528\u7684\u5bf9\u8c61<br \/>\n\u6bd4\u5982\uff1a<\/span><span style=\"color: #000000;\">Java \u7c7b\u7684\u5f15\u7528\u7c7b\u578b\u9759\u6001\u53d8\u91cf <\/span><\/li>\n<li><span style=\"color: #000000;\">\u6240\u6709\u88ab\u540c\u6b65\u9501 synchronized \u6301\u6709\u7684\u5bf9\u8c61 <\/span><\/li>\n<li><span style=\"color: #000000;\">Java \u865a\u62df\u673a\u5185\u90e8\u7684\u5f15\u7528\u3002 <\/span><br \/>\n<span style=\"color: #000000;\">\u57fa \u672c \u6570 \u636e \u7c7b \u578b \u5bf9 \u5e94 \u7684 Class \u5bf9 \u8c61 \uff0c \u4e00 \u4e9b \u5e38 \u9a7b \u7684 \u5f02 \u5e38 \u5bf9 \u8c61 \uff08 \u5982 \uff1a <\/span><span style=\"color: #000000;\">NullPointerException\u3001OutofMemoryError\uff09\uff0c\u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668\u3002<\/span><\/li>\n<\/ol>\n<div><span style=\"color: #000000;\"><strong>6.2.1.4 \u5bf9\u8c61\u7684 finalization \u673a\u5236 <\/strong><\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>finalize() \u65b9\u6cd5\u673a\u5236\uff1a<\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\"><strong>\u00a0 \u00a0 \u00a0 \u00a0<\/strong><\/span> <span style=\"color: #000000;\">\u5bf9\u8c61\u9500\u6bc1\u524d\u7684\u56de\u8c03\u65b9\u6cd5\uff1a<strong>finalize()\uff1b <\/strong><\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0Java \u8bed\u8a00\u63d0\u4f9b\u4e86\u5bf9\u8c61\u7ec8\u6b62\uff08finalization\uff09\u673a\u5236\u6765\u5141\u8bb8\u5f00\u53d1\u4eba\u5458\u63d0\u4f9b\u5bf9\u8c61\u88ab\u9500\u6bc1\u4e4b\u524d\u7684\u81ea\u5b9a\u4e49\u5904\u7406\u903b\u8f91\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5f53\u5783\u573e\u56de\u6536\u5668\u53d1\u73b0\u6ca1\u6709\u5f15\u7528\u6307\u5411\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5373\uff1a\u5783\u573e\u56de\u6536\u6b64\u5bf9\u8c61\u4e4b\u524d\uff0c\u603b\u4f1a\u5148\u8c03\u7528\u8fd9\u4e2a\u5bf9\u8c61\u7684 finalize()\u65b9\u6cd5,\u4e00\u4e2a\u5bf9\u8c61\u7684 finalize()\u65b9\u6cd5\u53ea\u88ab\u8c03\u7528\u4e00\u6b21\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 finalize() \u65b9\u6cd5\u5141\u8bb8\u5728\u5b50\u7c7b\u4e2d\u88ab\u91cd\u5199\uff0c\u7528\u4e8e\u5728\u5bf9\u8c61\u88ab\u56de\u6536\u65f6\u8fdb\u884c\u8d44\u6e90\u91ca\u653e\u3002\u901a\u5e38\u5728\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\u8fdb\u884c\u4e00\u4e9b\u8d44\u6e90\u91ca\u653e\u548c\u6e05\u7406\u7684\u5de5\u4f5c\uff0c\u6bd4\u5982\u5173\u95ed\u6587\u4ef6\u3001\u5957\u63a5\u5b57\u548c\u6570\u636e\u5e93\u8fde\u63a5\u7b49\u3002 <\/span><\/div>\n<div><\/div>\n<div><strong><span style=\"color: #000000;\">Object \u7c7b\u4e2d finalize() \u6e90\u7801 <\/span><\/strong><\/div>\n<div>\n<pre><code class=\"language-cpp\">protected void finalize() throws Throwable { }<\/code><\/pre>\n<\/div>\n<div><span style=\"color: #000000;\">\u6c38\u8fdc\u4e0d\u8981\u4e3b\u52a8\u8c03\u7528\u67d0\u4e2a\u5bf9\u8c61\u7684 finalize()\u65b9\u6cd5\uff0c\u5e94\u8be5\u4ea4\u7ed9\u5783\u573e\u56de\u6536\u673a\u5236\u8c03\u7528\u3002\u7406\u7531\u5305\u62ec\u4e0b\u9762\u4e09\u70b9\uff1a <\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u5728 finalize()\u65f6\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5bf9\u8c61\u590d\u6d3b\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">finalize()\u65b9\u6cd5\u7684\u6267\u884c\u65f6\u95f4\u662f\u6ca1\u6709\u4fdd\u969c\u7684\uff0c\u5b83\u5b8c\u5168\u7531 GC \u7ebf\u7a0b\u51b3\u5b9a\uff0c\u6781\u7aef\u60c5\u51b5\u4e0b\uff0c<\/span><span style=\"color: #000000;\">\u82e5\u4e0d\u53d1\u751f GC\uff0c\u5219 finalize()\u65b9\u6cd5\u5c06\u6ca1\u6709\u6267\u884c\u673a\u4f1a\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u4e00\u4e2a\u7cdf\u7cd5\u7684 finalize()\u4f1a\u4e25\u91cd\u5f71\u54cd GC \u7684\u6027\u80fd\u3002\u6bd4\u5982 finalize \u662f\u4e2a\u6b7b\u5faa\u73af\u3002 <\/span><\/li>\n<\/ol>\n<p><span style=\"color: #000000;\"><strong>6.2.1.5 \u751f\u5b58\u8fd8\u662f\u6b7b\u4ea1\uff1f <\/strong><\/span><\/p>\n<div><span style=\"color: #000000;\"><strong>\u7531\u4e8e finalize()\u65b9\u6cd5\u7684\u5b58\u5728\uff0c\u865a\u62df\u673a\u4e2d\u7684\u5bf9\u8c61\u4e00\u822c\u5904\u4e8e\u4e09\u79cd\u53ef\u80fd\u7684\u72b6\u6001\u3002<\/strong><\/span><\/p>\n<\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u5982\u679c\u4ece\u6240\u6709\u7684\u6839\u8282\u70b9\u90fd\u65e0\u6cd5\u8bbf\u95ee\u5230\u67d0\u4e2a\u5bf9\u8c61\uff0c\u8bf4\u660e\u5bf9\u8c61\u5df1\u7ecf\u4e0d\u518d\u4f7f\u7528\u4e86\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u6b64\u5bf9\u8c61\u9700\u8981\u88ab\u56de\u6536\u3002\u4f46\u4e8b\u5b9e\u4e0a\uff0c\u4e5f\u5e76\u975e\u662f\u201c\u975e\u6b7b\u4e0d\u53ef\u201d\u7684\uff0c\u8fd9\u65f6\u5019\u5b83\u4eec\u6682\u65f6\u5904\u4e8e\u201c\u7f13\u5211\u201d\u9636\u6bb5\u3002\u4e00\u4e2a\u65e0\u6cd5\u89e6\u53ca\u7684\u5bf9\u8c61\u6709\u53ef\u80fd\u5728\u67d0\u4e00\u4e2a\u6761\u4ef6\u4e0b\u201c\u590d\u6d3b\u201d\u81ea\u5df1\uff0c\u5982\u679c\u8fd9\u6837\uff0c\u90a3\u4e48\u5bf9\u5b83\u7acb\u5373\u8fdb\u884c\u56de\u6536\u5c31\u662f\u4e0d\u5408\u7406\u7684\u3002<\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u4e3a\u6b64\uff0c\u5b9a\u4e49\u865a\u62df\u673a\u4e2d\u7684\u5bf9\u8c61\u53ef\u80fd\u7684<strong>\u4e09\u79cd\u72b6\u6001<\/strong><\/span> <span style=\"color: #000000;\">\u3002\u5982\u4e0b\uff1a <\/span><\/div>\n<ul>\n<li><span style=\"color: #000000;\"><strong>\u53ef\u89e6\u53ca\u7684\uff1a<\/strong><\/span><span style=\"color: #000000;\">\u4ece\u6839\u8282\u70b9\u5f00\u59cb\uff0c\u53ef\u4ee5\u5230\u8fbe\u8fd9\u4e2a\u5bf9\u8c61\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u53ef\u590d\u6d3b\u7684\uff1a<\/strong><\/span><span style=\"color: #000000;\">\u5bf9\u8c61\u7684\u6240\u6709\u5f15\u7528\u90fd\u88ab\u91ca\u653e\uff0c\u4f46\u662f\u5bf9\u8c61\u6709\u53ef\u80fd\u5728 finalize()\u4e2d\u590d\u6d3b\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u4e0d\u53ef\u89e6\u53ca\u7684\uff1a<\/strong><\/span><span style=\"color: #000000;\">\u5bf9\u8c61\u7684 finalize()\u88ab\u8c03\u7528\uff0c\u5e76\u4e14\u6ca1\u6709\u590d\u6d3b\uff0c\u90a3\u4e48\u5c31\u4f1a\u8fdb\u5165\u4e0d\u53ef\u89e6\u53ca\u72b6\u6001\u3002 <\/span><\/li>\n<\/ul>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4ee5\u4e0a 3 \u79cd\u72b6\u6001\u4e2d\uff0c\u662f\u7531\u4e8e finalize()\u65b9\u6cd5\u7684\u5b58\u5728\uff0c\u8fdb\u884c\u7684\u533a\u5206\u3002\u53ea\u6709\u5728\u5bf9\u8c61\u4e0d\u53ef\u89e6\u53ca\u65f6\u624d\u53ef\u4ee5\u88ab\u56de\u6536\u3002 <\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>\u5177\u4f53\u8fc7\u7a0b <\/strong><\/span><\/div>\n<div>\n<span style=\"color: #000000;\">\u5224\u5b9a\u4e00\u4e2a\u5bf9\u8c61 objA \u662f\u5426\u53ef\u56de\u6536\uff0c\u81f3\u5c11\u8981\u7ecf\u5386\u4e24\u6b21\u6807\u8bb0\u8fc7\u7a0b\uff1a <\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u5982\u679c\u5bf9\u8c61 objA \u5230 GC Roots \u6ca1\u6709\u5f15\u7528\u94fe\uff0c\u5219\u8fdb\u884c\u7b2c\u4e00\u6b21\u6807\u8bb0\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u8fdb\u884c\u7b5b\u9009\uff0c\u5224\u65ad\u6b64\u5bf9\u8c61\u662f\u5426\u6709\u5fc5\u8981\u6267\u884c finalize()\u65b9\u6cd5\uff1a<\/span><\/li>\n<\/ol>\n<ul>\n<li><span style=\"color: #000000;\">\u5982\u679c\u5bf9\u8c61 objA \u6ca1\u6709\u91cd\u5199 finalize()\u65b9\u6cd5\uff0c\u6216\u8005 finalize()\u65b9\u6cd5\u5df2\u7ecf\u88ab\u865a\u62df\u673a\u8c03\u7528\u8fc7\uff0c\u5219\u865a\u62df\u673a\u89c6\u4e3a\u201c\u6ca1\u6709\u5fc5\u8981\u6267\u884c\u201d\uff0cobjA \u88ab\u5224\u5b9a\u4e3a\u4e0d\u53ef\u89e6\u53ca\u7684\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5982\u679c\u5bf9\u8c61 objA \u91cd\u5199\u4e86 finalize()\u65b9\u6cd5\uff0c\u4e14\u8fd8\u672a\u6267\u884c\u8fc7\uff0c\u90a3\u4e48 objA \u4f1a\u88ab\u63d2\u5165\u5230\u961f\u5217\u4e2d\uff0c\u7531\u4e00\u4e2a\u865a\u62df\u673a\u81ea\u52a8\u521b\u5efa\u7684\u3001\u4f4e\u4f18\u5148\u7ea7\u7684 Finalizer \u7ebf\u7a0b\u89e6\u53d1\u5176finalize()\u65b9\u6cd5\u6267\u884c\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">finalize()\u65b9\u6cd5\u662f\u5bf9\u8c61\u9003\u8131\u6b7b\u4ea1\u7684\u6700\u540e\u673a\u4f1a\uff0c\u7a0d\u540e GC \u4f1a\u5bf9\u961f\u5217\u4e2d\u7684\u5bf9\u8c61\u8fdb\u884c\u7b2c\u4e8c\u6b21\u6807\u8bb0\u3002\u5982\u679c objA \u5728 finalize()\u65b9\u6cd5\u4e2d\u4e0e\u5f15\u7528\u94fe\u4e0a\u7684\u4efb\u4f55\u4e00\u4e2a\u5bf9\u8c61\u5efa\u7acb\u4e86\u8054\u7cfb\uff0c\u90a3\u4e48\u5728\u7b2c\u4e8c\u6b21\u6807\u8bb0\u65f6\uff0cobjA \u4f1a\u88ab\u79fb\u51fa\u201c\u5373\u5c06\u56de\u6536\u201d\u96c6\u5408\u3002\u4e4b\u540e\uff0c\u5bf9\u8c61\u4f1a\u518d\u6b21\u51fa\u73b0\u6ca1\u6709\u5f15\u7528\u5b58\u5728\u7684\u60c5\u51b5\u3002\u5728\u8fd9\u4e2a\u60c5\u51b5\u4e0b\uff0cfinalize()\u65b9\u6cd5\u4e0d\u4f1a\u88ab\u518d\u6b21\u8c03\u7528\uff0c\u5bf9\u8c61\u4f1a\u76f4\u63a5\u53d8\u6210\u4e0d\u53ef\u89e6\u53ca\u7684\u72b6\u6001\u3002 <\/span><\/li>\n<\/ul>\n<div><\/div>\n<div><span style=\"color: #000000;\"><strong>\u4ee3\u7801\u6f14\u793a finalize() \u65b9\u6cd5\u53ef\u590d\u6d3b\u5bf9\u8c61 <\/strong><\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\">\u7b2c\u4e00\u6b21\u81ea\u6551\u6210\u529f\uff0c\u4f46\u7531\u4e8e finalize() \u65b9\u6cd5\u53ea\u4f1a\u6267\u884c\u4e00\u6b21\uff0c\u6240\u4ee5\u7b2c\u4e8c\u6b21\u81ea\u6551\u5931\u8d25\u3002<\/span><\/div>\n<h3 id=\"6.2.2%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E9%98%B6%E6%AE%B5%E7%AE%97%E6%B3%95\"><span style=\"color: #000000;\"><strong>6.2.2 \u5783\u573e\u56de\u6536\u9636\u6bb5\u7b97\u6cd5<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u5f53\u6210\u529f\u533a\u5206\u51fa\u5185\u5b58\u4e2d\u5b58\u6d3b\u5bf9\u8c61\u548c\u6b7b\u4ea1\u5bf9\u8c61\u540e\uff0cGC \u63a5\u4e0b\u6765\u7684\u4efb\u52a1\u5c31\u662f\u6267\u884c\u5783\u573e\u56de\u6536\uff0c\u91ca\u653e\u6389\u65e0\u7528\u5bf9\u8c61\u6240\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u4ee5\u4fbf\u6709\u8db3\u591f\u7684\u53ef\u7528\u5185\u5b58\u7a7a\u95f4\u4e3a\u65b0\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u3002\u76ee\u524d\u5728 JVM \u4e2d\u6bd4\u8f83\u5e38\u89c1\u7684\u4e09\u79cd\u5783\u573e\u6536\u96c6\u7b97\u6cd5\u662f: <\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\"><strong>\u6807\u8bb0-\u590d\u5236\u7b97\u6cd5\uff08Copying\uff09 <\/strong><\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\uff08Mark-Sweep\uff09 <\/strong><\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u6807\u8bb0-\u538b\u7f29\u7b97\u6cd5\uff08Mark-Compact\uff09<\/strong><\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\"><strong>6.2.2.1 \u6807\u8bb0-\u590d\u5236\u7b97\u6cd5<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u5b83\u5c06\u53ef\u7528\u5185\u5b58\u6309\u5bb9\u91cf\u5212\u5206\u4e3a\u5927\u5c0f\u76f8\u7b49\u7684\u4e24\u5757\uff0c\u6bcf\u6b21\u53ea\u4f7f\u7528\u5176\u4e2d\u7684\u4e00\u5757\u3002\u5728\u5783 \u573e\u56de\u6536\u65f6\u5c06\u6b63\u5728\u4f7f\u7528\u7684\u5185\u5b58\u4e2d\u7684\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230\u672a\u88ab\u4f7f\u7528\u7684\u5185\u5b58\u5757\u4e2d\uff0c\u4e4b\u540e\u6e05\u9664 \u6b63\u5728\u4f7f\u7528\u7684\u5185\u5b58\u5757\u4e2d\u7684\u6240\u6709\u5bf9\u8c61\uff0c\u4ea4\u6362\u4e24\u4e2a\u5185\u5b58\u7684\u89d2\u8272\uff0c\u6700\u540e\u5b8c\u6210\u5783\u573e\u56de\u6536\u3002<\/span><\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-18\/202307141358181b1b1ac62.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"584\" height=\"327\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-18\/202307141358181b1b1ac62.png\" alt=\"\" width=\"584\" height=\"327\" \/><\/noscript><\/p>\n<p><span style=\"color: #000000;\"><strong>\u590d\u5236\u7b97\u6cd5\u7684\u4f18\u7f3a\u70b9 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u4f18\u70b9 <\/strong><\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\">\u6ca1\u6709\u6807\u8bb0\u548c\u6e05\u9664\u8fc7\u7a0b\uff0c\u5b9e\u73b0\u7b80\u5355\uff0c\u8fd0\u884c\u9ad8\u6548<\/span><\/li>\n<li><span style=\"color: #000000;\">\u590d\u5236\u8fc7\u53bb\u4ee5\u540e\u4fdd\u8bc1\u7a7a\u95f4\u7684\u8fde\u7eed\u6027\uff0c\u4e0d\u4f1a\u51fa\u73b0\u201c\u788e\u7247\u201d\u95ee\u9898\u3002 <\/span><\/li>\n<\/ul>\n<div>\n<div><span style=\"color: #000000;\"><strong>\u7f3a\u70b9 <\/strong><\/span><\/div>\n<ul>\n<li><span style=\"color: #000000;\">\u6b64\u7b97\u6cd5\u7684\u7f3a\u70b9\u4e5f\u662f\u5f88\u660e\u663e\u7684\uff0c\u5c31\u662f\u9700\u8981\u4e24\u500d\u7684\u5185\u5b58\u7a7a\u95f4\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5bf9\u4e8e G1 \u8fd9\u79cd\u5206\u62c6\u6210\u4e3a\u5927\u91cf region \u7684 GC\uff0c\u590d\u5236\u800c\u4e0d\u662f\u79fb\u52a8\uff0c\u610f\u5473\u7740 GC \u9700\u8981\u7ef4\u62a4 region \u4e4b\u95f4\u5bf9\u8c61\u5f15\u7528\u5173\u7cfb\uff0c\u4e0d\u7ba1\u662f\u5185\u5b58\u5360\u7528\u6216\u8005\u65f6\u95f4\u5f00\u9500\u4e5f\u4e0d\u5c0f.<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\"><strong>\u590d\u5236\u7b97\u6cd5\u7684\u5e94\u7528\u573a\u666f <\/strong><\/span><\/p>\n<ol>\n<li><span style=\"color: #000000;\">\u5982\u679c\u7cfb\u7edf\u4e2d\u7684\u5783\u573e\u5bf9\u8c61\u5f88\u591a\uff0c\u590d\u5236\u7b97\u6cd5\u9700\u8981\u590d\u5236\u7684\u5b58\u6d3b\u5bf9\u8c61\u6570\u91cf\u5e76\u4e0d\u4f1a\u592a\u5927\uff0c\u6548\u7387\u8f83\u9ad8 <\/span><\/li>\n<\/ol>\n<\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u8001\u5e74\u4ee3\u5927\u91cf\u7684\u5bf9\u8c61\u5b58\u6d3b\uff0c\u90a3\u4e48\u590d\u5236\u7684\u5bf9\u8c61\u5c06\u4f1a\u6709\u5f88\u591a\uff0c\u6548\u7387\u4f1a\u5f88\u4f4e <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5728\u65b0\u751f\u4ee3\uff0c\u5bf9\u5e38\u89c4\u5e94\u7528\u7684\u5783\u573e\u56de\u6536\uff0c\u4e00\u6b21\u901a\u5e38\u53ef\u4ee5\u56de\u6536 70% - 99% \u7684\u5185\u5b58\u7a7a\u95f4\u3002<\/span><span style=\"color: #000000;\">\u56de\u6536\u6027\u4ef7\u6bd4\u5f88\u9ad8\u3002\u6240\u4ee5\u73b0\u5728\u7684\u5546\u4e1a\u865a\u62df\u673a\u90fd\u662f\u7528\u8fd9\u79cd\u6536\u96c6\u7b97\u6cd5\u56de\u6536\u65b0\u751f\u4ee3\u3002 <\/span><\/li>\n<\/ol>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-19\/2023071413581956560d064.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"461\" height=\"207\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-19\/2023071413581956560d064.png\" alt=\"\" width=\"461\" height=\"207\" \/><\/noscript><\/p>\n<p><span style=\"color: #000000;\"><strong>6.2.2.2 \u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u6267\u884c\u8fc7\u7a0b <\/strong><br \/>\n\u5f53\u5806\u4e2d\u7684\u6709\u6548\u5185\u5b58\u7a7a\u95f4\u88ab\u8017\u5c3d\u7684\u65f6\u5019\uff0c\u7136\u540e\u8fdb\u884c\u8fd9\u9879\u5de5\u4f5c.<br \/>\n<\/span><span style=\"color: #000000;\"><strong>\u6e05\u9664\uff1a<\/strong><\/span><span style=\"color: #000000;\">\u8fd9\u91cc\u6240\u8c13\u7684\u6e05\u9664\u5e76\u4e0d\u662f\u771f\u7684\u7f6e\u7a7a\uff0c\u800c\u662f\u628a\u9700\u8981\u6e05\u9664\u7684\u5bf9\u8c61\u5730\u5740\u4fdd\u5b58\u5728\u7a7a\u95f2\u7684\u5730\u5740\u5217\u8868\u91cc\u3002\u4e0b\u6b21\u6709\u65b0\u5bf9\u8c61\u9700\u8981\u52a0\u8f7d\u65f6\uff0c\u5224\u65ad\u5783\u573e\u7684\u4f4d\u7f6e\u7a7a\u95f4\u662f\u5426\u591f\uff0c\u5982\u679c\u591f\uff0c\u5c31\u5b58\u653e\uff08\u4e5f\u5c31\u662f\u8986\u76d6\u539f\u6709\u7684\u5730\u5740\uff09<\/span><\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-19\/20230714135819787868a1a.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"530\" height=\"381\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-19\/20230714135819787868a1a.png\" alt=\"\" width=\"530\" height=\"381\" \/><\/noscript><\/p>\n<p><span style=\"color: #000000;\">\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u7684\u4f18\u70b9\uff1a<br \/>\n\u975e\u5e38\u57fa\u7840\u548c\u5e38\u89c1\u7684\u5783\u573e\u6536\u96c6\u7b97\u6cd5\u5bb9\u6613\u7406\u89e3<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u7684\u7f3a\u70b9\uff1a<br \/>\n\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\u7684\u6548\u7387\u4e0d\u7b97\u9ad8<br \/>\n\u8fd9\u79cd\u65b9\u5f0f\u6e05\u7406\u51fa\u6765\u7684\u7a7a\u95f2\u5185\u5b58\u662f\u4e0d\u8fde\u7eed\u7684\uff0c\u4ea7\u751f\u5185\u788e\u7247\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>6.2.2.3 \u6807\u8bb0-\u538b\u7f29\u7b97\u6cd5<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u80cc\u666f<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u590d\u5236\u7b97\u6cd5\u7684\u9ad8\u6548\u6027\u662f\u5efa\u7acb\u5728\u5b58\u6d3b\u5bf9\u8c61\u5c11\u3001\u5783\u573e\u5bf9\u8c61\u591a\u7684\u524d\u63d0\u4e0b\u7684\u3002\u8fd9\u79cd\u60c5\u51b5\u5728\u65b0\u751f\u4ee3\u7ecf\u5e38\u53d1\u751f\uff0c\u4f46\u662f\u5728\u8001\u5e74\u4ee3\uff0c\u66f4\u5e38\u89c1\u7684\u60c5\u51b5\u662f\u5927\u90e8\u5206\u5bf9\u8c61\u90fd\u662f\u5b58\u6d3b\u5bf9\u8c61\u3002 \u5982\u679c\u4f9d\u7136\u4f7f\u7528\u590d\u5236\u7b97\u6cd5\uff0c\u7531\u4e8e\u5b58\u6d3b\u5bf9\u8c61\u8f83\u591a\uff0c\u590d\u5236\u7684\u6210\u672c\u4e5f\u5c06\u5f88\u9ad8\u3002\u56e0\u6b64\uff0c\u57fa\u4e8e\u8001\u5e74\u4ee3\u5783\u573e\u56de\u6536\u7684\u7279\u6027\uff0c\u9700\u8981\u4f7f\u7528\u5176\u4ed6\u7684\u7b97\u6cd5\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u7684\u786e\u53ef\u4ee5\u5e94\u7528\u5728\u8001\u5e74\u4ee3\u4e2d\uff0c\u4f46\u662f\u8be5\u7b97\u6cd5\u4e0d\u4ec5\u6267\u884c\u6548\u7387\u4f4e\u4e0b\uff0c\u800c\u4e14\u5728\u6267\u884c\u5b8c\u5185\u5b58\u56de\u6536\u540e\u8fd8\u4f1a\u4ea7\u751f\u5185\u5b58\u788e\u7247\uff0c\u6240\u4ee5 JVM \u7684\u8bbe\u8ba1\u8005\u9700\u8981\u5728\u6b64\u57fa\u7840\u4e4b\u4e0a\u8fdb\u884c\u6539\u8fdb<\/span><br \/>\n<span style=\"color: #000000;\"><strong>\u6807\u8bb0\u538b\u7f29\u7b97\u6cd5\u6267\u884c\u8fc7\u7a0b <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u7b2c\u4e00\u9636\u6bb5\u548c\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\u4e00\u6837\uff0c\u4ece\u6839\u8282\u70b9\u5f00\u59cb\u6807\u8bb0\u6240\u6709\u88ab\u5f15\u7528\u5bf9\u8c61<br \/>\n\u7b2c\u4e8c\u9636\u6bb5\u5c06\u6240\u6709\u7684\u5b58\u6d3b\u5bf9\u8c61\u538b\u7f29\u5230\u5185\u5b58\u7684\u4e00\u7aef\uff0c\u6309\u987a\u5e8f\u6392\u653e\u3002\u4e4b\u540e\uff0c\u6e05\u7406\u8fb9\u754c\u5916\u6240\u6709\u7684\u7a7a\u95f4\u3002<\/span><\/p>\n<div><\/div>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-20\/202307141358206d6d3b296.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"538\" height=\"348\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-20\/202307141358206d6d3b296.png\" alt=\"\" width=\"538\" height=\"348\" \/><\/noscript><\/p>\n<p><span style=\"color: #000000;\"><strong>\u6807\u8bb0-\u538b\u7f29\u7b97\u6cd5\u4e0e\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u7684\u6bd4\u8f83 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u6807\u8bb0-\u538b\u7f29\u7b97\u6cd5\u7684\u6700\u7ec8\u6548\u679c\u7b49\u540c\u4e8e\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u6267\u884c\u5b8c\u6210\u540e\uff0c\u518d\u8fdb\u884c\u4e00\u6b21\u5185\u5b58\u788e\u7247\u6574\u7406\uff0c\u56e0\u6b64\uff0c\u4e5f\u53ef\u4ee5\u628a\u5b83\u79f0\u4e3a\u6807\u8bb0-\u6e05\u9664-\u538b\u7f29\uff08Mark-Sweep-Compact\uff09\u7b97\u6cd5\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4e8c\u8005\u7684\u672c\u8d28\u5dee\u5f02\u5728\u4e8e\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u662f\u4e00\u79cd\u975e\u79fb\u52a8\u5f0f\u7684\u56de\u6536\u7b97\u6cd5\uff08\u7a7a\u95f2\u5217\u8868\u8bb0\u5f55\u4f4d\u7f6e\uff09\uff0c\u6807\u8bb0-\u538b\u7f29\u662f\u79fb\u52a8\u5f0f\u7684\u3002\u662f\u5426\u79fb\u52a8\u56de\u6536\u540e\u7684\u5b58\u6d3b\u5bf9\u8c61\u662f\u4e00\u9879\u4f18\u7f3a\u70b9\u5e76\u5b58\u7684\u98ce\u9669\u51b3\u7b56\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u53ef\u4ee5\u770b\u5230\uff0c\u6807\u8bb0\u7684\u5b58\u6d3b\u5bf9\u8c61\u5c06\u4f1a\u88ab\u6574\u7406\uff0c\u6309\u7167\u5185\u5b58\u5730\u5740\u4f9d\u6b21\u6392\u5217\uff0c\u800c\u672a\u88ab\u6807\u8bb0\u7684\u5185\u5b58\u4f1a\u88ab\u6e05\u7406\u6389\u3002\u5982\u6b64\u4e00\u6765\uff0c\u5f53\u6211\u4eec\u9700\u8981\u7ed9\u65b0\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u65f6JVM \u53ea\u9700\u8981\u6301\u6709\u4e00\u4e2a\u5185\u5b58\u7684\u8d77\u59cb\u5730\u5740\u5373\u53ef\uff0c\u8fd9\u6bd4\u7ef4\u62a4\u4e00\u4e2a\u7a7a\u95f2\u5217\u8868\u663e\u7136\u5c11\u4e86\u8bb8\u591a\u5f00\u9500\u3002<\/span><\/p>\n<\/div>\n<p><span style=\"color: #000000;\"><strong>\u6807\u8bb0-\u538b\u7f29\u7b97\u6cd5\u7684\u4f18\u7f3a\u70b9 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u4f18\u70b9 <\/strong><\/span><\/p>\n<ol>\n<li><span style=\"color: #000000;\">\u6d88\u9664\u4e86\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u5f53\u4e2d\uff0c\u5185\u5b58\u533a\u57df\u5206\u6563\u7684\u7f3a\u70b9\uff0c\u6211\u4eec\u9700\u8981\u7ed9\u65b0\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u65f6\uff0cJVM \u53ea\u9700\u8981\u6301\u6709\u4e00\u4e2a\u5185\u5b58\u7684\u8d77\u59cb\u5730\u5740\u5373\u53ef\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u6d88\u9664\u4e86\u590d\u5236\u7b97\u6cd5\u5f53\u4e2d\uff0c\u5185\u5b58\u51cf\u534a\u7684\u9ad8\u989d\u4ee3\u4ef7\u3002 <\/span><\/li>\n<\/ol>\n<div><span style=\"color: #000000;\"><strong>\u7f3a\u70b9 <\/strong><\/span><\/div>\n<ol>\n<li><span style=\"color: #000000;\">\u4ece\u6548\u7387\u4e0a\u6765\u8bf4\uff0c\u6807\u8bb0-\u538b\u7f29\u7b97\u6cd5\u8981\u4f4e\u4e8e\u590d\u5236\u7b97\u6cd5\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u79fb\u52a8\u5bf9\u8c61\u7684\u540c\u65f6\uff0c\u5982\u679c\u5bf9\u8c61\u88ab\u5176\u4ed6\u5bf9\u8c61\u5f15\u7528\uff0c\u5219\u8fd8\u9700\u8981\u8c03\u6574\u5f15\u7528\u7684\u5730\u5740 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u79fb\u52a8\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u5168\u7a0b\u6682\u505c\u7528\u6237\u5e94\u7528\u7a0b\u5e8f\u3002\u5373\uff1aSTW<\/span><\/li>\n<\/ol>\n<p><span style=\"color: #000000;\"><strong>6.2.2.4 \u5783\u573e\u56de\u6536\u7b97\u6cd5\u5c0f\u7ed3 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u6548\u7387\u4e0a\u6765\u8bf4\uff0c\u590d\u5236\u7b97\u6cd5\u662f\u5f53\u4e4b\u65e0\u6127\u7684\u8001\u5927\uff0c\u4f46\u662f\u5374\u6d6a\u8d39\u4e86\u592a\u591a\u5185\u5b58\u3002\u800c\u4e3a\u4e86\u5c3d\u91cf\u517c\u987e\u4e0a\u9762\u63d0\u5230\u7684\u4e09\u4e2a\u6307\u6807\uff0c\u6807\u8bb0-\u538b\u7f29\u7b97\u6cd5\u76f8\u5bf9\u6765\u8bf4\u66f4\u5e73\u6ed1\u4e00\u4e9b\uff0c\u4f46\u662f\u6548\u7387\u4e0a\u4e0d\u5c3d\u5982\u4eba\u610f\uff0c\u5b83\u6bd4\u590d\u5236\u7b97\u6cd5\u591a\u4e86\u4e00\u4e2a\u6807\u8bb0\u7684\u9636\u6bb5\uff0c\u6bd4\u6807\u8bb0-\u6e05\u9664\u591a\u4e86\u4e00\u4e2a\u6574\u7406\u5185\u5b58\u7684\u9636\u6bb5\u3002<\/span><\/p>\n<table style=\"width: 500px;\" border=\"1\" cellspacing=\"1\" cellpadding=\"1\">\n<tbody>\n<tr>\n<td style=\"text-align: center;\"><\/td>\n<td style=\"text-align: center;\">\u6807\u8bb0\u6e05\u9664<\/td>\n<td style=\"text-align: center;\">\u6807\u8bb0\u6574\u7406<\/td>\n<td style=\"text-align: center;\">\u590d\u5236<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u901f\u7387<\/td>\n<td style=\"text-align: center;\">\u4e2d\u7b49<\/td>\n<td style=\"text-align: center;\">\u6700\u6162<\/td>\n<td style=\"text-align: center;\">\u6700\u5feb<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u7a7a\u95f4\u5f00\u9500<\/td>\n<td style=\"text-align: center;\">\u5c11\uff08\u4f1a\u5806\u79ef\u788e\u7247\uff09<\/td>\n<td style=\"text-align: center;\">\u5c11\uff08\u65e0\u5806\u79ef\u788e\u7247\uff09<\/td>\n<td style=\"text-align: center;\">\u901a\u5e38\u9700\u8981\u6d3b\u52a8\u5bf9\u8c61\u7684\u4e24\u500d\u7a7a\u95f4\uff08\u65e0\u5806\u79ef\u788e\u7247\uff09<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u79fb\u52a8\u5bf9\u8c61<\/td>\n<td style=\"text-align: center;\">\u5426<\/td>\n<td style=\"text-align: center;\">\u662f<\/td>\n<td style=\"text-align: center;\">\u662f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong style=\"color: #000000;\">6.2.2.5 \u5206\u4ee3\u6536\u96c6<\/strong><\/p>\n<p><span style=\"color: #000000;\"><strong>\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u5206\u4ee3\u6536\u96c6 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u524d\u9762\u6240\u6709\u8fd9\u4e9b\u7b97\u6cd5\u4e2d\uff0c\u5e76\u6ca1\u6709\u4e00\u79cd\u7b97\u6cd5\u53ef\u4ee5\u5b8c\u5168\u66ff\u4ee3\u5176\u4ed6\u7b97\u6cd5\uff0c\u5b83\u4eec\u90fd\u5177\u6709\u81ea\u5df1\u72ec\u7279\u7684\u4f18\u52bf\u548c\u7279\u70b9\u3002\u5206\u4ee3\u6536\u96c6\u5e94\u8fd0\u800c\u751f\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5206\u4ee3\u6536\u96c6\uff0c\u662f\u57fa\u4e8e\u8fd9\u6837\u4e00\u4e2a\u4e8b\u5b9e\uff1a\u4e0d\u540c\u7684\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u662f\u4e0d\u4e00\u6837\u7684\u3002\u56e0\u6b64\uff0c\u4e0d\u540c\u751f\u547d\u5468\u671f\u7684\u5bf9\u8c61\u53ef\u4ee5\u91c7\u53d6\u4e0d\u540c\u7684\u6536\u96c6\u65b9\u5f0f\uff0c\u4ee5\u4fbf\u63d0\u9ad8\u56de\u6536\u6548\u7387\u3002\u4e00\u822c\u662f\u628a Java\u5806\u5206\u4e3a\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u6839\u636e\u5404\u4e2a\u5e74\u4ee3\u7684\u7279\u70b9\u4f7f\u7528\u4e0d\u540c\u7684\u56de\u6536\u7b97\u6cd5\uff0c\u4ee5\u63d0\u9ad8\u5783\u573e\u56de\u6536\u7684\u6548\u7387\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5728 Java \u7a0b\u5e8f\u8fd0\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u4ea7\u751f\u5927\u91cf\u7684\u5bf9\u8c61\uff0c\u5176\u4e2d\u6709\u4e9b\u5bf9\u8c61\u662f\u4e0e\u4e1a\u52a1\u4fe1\u606f\u76f8\u5173: \u6bd4\u5982 Http \u8bf7\u6c42\u4e2d\u7684 Session \u5bf9\u8c61\u3001\u7ebf\u7a0b\u3001Socket \u8fde\u63a5\uff0c\u8fd9\u7c7b\u5bf9\u8c61\u8ddf\u4e1a\u52a1\u76f4\u63a5\u6302\u94a9\uff0c\u56e0\u6b64\u751f\u547d\u5468\u671f\u6bd4\u8f83\u957f\u3002\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u4f46\u662f\u8fd8\u6709\u4e00\u4e9b\u5bf9\u8c61\uff0c\u4e3b\u8981\u662f\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u751f\u6210\u7684\u4e34\u65f6\u53d8\u91cf\uff0c\u8fd9\u4e9b\u5bf9\u8c61\u751f\u547d\u5468\u671f\u4f1a\u6bd4\u8f83\u77ed\uff0c\u6bd4\u5982\uff1aString \u5bf9\u8c61\uff0c\u7531\u4e8e\u5176\u4e0d\u53d8\u7c7b\u7684\u7279\u6027\uff0c\u7cfb\u7edf\u4f1a\u4ea7\u751f\u5927\u91cf\u7684\u8fd9\u4e9b\u5bf9\u8c61\uff0c\u6709\u4e9b\u5bf9\u8c61\u751a\u81f3\u53ea\u7528\u4e00\u6b21\u5373\u53ef\u56de\u6536\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u76ee\u524d\u51e0\u4e4e\u6240\u6709\u7684 GC \u90fd\u91c7\u7528\u5206\u4ee3\u624b\u673a\u7b97\u6cd5\u6267\u884c\u5783\u573e\u56de\u6536\u7684\u5728 HotSpot \u4e2d\uff0c\u57fa\u4e8e\u5206\u4ee3\u7684\u6982\u5ff5\uff0cGC \u6240\u4f7f\u7528\u7684\u5185\u5b58\u56de\u6536\u7b97\u6cd5\u5fc5\u987b\u7ed3\u5408\u5e74\u8f7b\u4ee3\u548c\u8001\u5e74\u4ee3\u5404\u81ea\u7684\u7279\u70b9\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u5e74\u8f7b\u4ee3\uff08Young Gen\uff09 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u5e74\u8f7b\u4ee3\u7279\u70b9\uff1a\u533a\u57df\u76f8\u5bf9\u8001\u5e74\u4ee3\u8f83\u5c0f\uff0c\u5bf9\u8c61\u751f\u547d\u5468\u671f\u77ed\u3001\u5b58\u6d3b\u7387\u4f4e\uff0c\u56de\u6536\u9891\u7e41\u3002 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u8fd9\u79cd\u60c5\u51b5\u590d\u5236\u7b97\u6cd5\u7684\u56de\u6536\u6574\u7406\uff0c\u901f\u5ea6\u662f\u6700\u5feb\u7684\u3002\u590d\u5236\u7b97\u6cd5\u7684\u6548\u7387\u53ea\u548c\u5f53\u524d\u5b58\u6d3b\u5bf9\u8c61\u5927\u5c0f\u6709\u5173\uff0c\u56e0\u6b64\u5f88\u9002\u7528\u4e8e\u5e74\u8f7b\u4ee3\u7684\u56de\u6536\u3002\u800c\u590d\u5236\u7b97\u6cd5\u5185\u5b58\u5229\u7528\u7387\u4e0d\u9ad8\u7684\u95ee\u9898\uff0c\u901a\u8fc7 hotspot \u4e2d\u7684\u4e24\u4e2a survivor \u7684\u8bbe\u8ba1\u5f97\u5230\u7f13\u89e3\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u8001\u5e74\u4ee3\uff08Tenured Gen\uff09 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u8001\u5e74\u4ee3\u7279\u70b9\uff1a\u533a\u57df\u8f83\u5927\uff0c\u5bf9\u8c61\u751f\u547d\u5468\u671f\u957f\u3001\u5b58\u6d3b\u7387\u9ad8\uff0c\u56de\u6536\u4e0d\u53ca\u5e74\u8f7b\u4ee3\u9891\u7e41\u3002 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u8fd9\u79cd\u60c5\u51b5\u5b58\u5728\u5927\u91cf\u5b58\u6d3b\u7387\u9ad8\u7684\u5bf9\u8c61\uff0c\u590d\u5236\u7b97\u6cd5\u660e\u663e\u53d8\u5f97\u4e0d\u5408\u9002\u3002\u4e00\u822c\u662f\u7531\u6807\u8bb0- \u6e05\u9664\u6216\u8005\u662f\u6807\u8bb0-\u6e05\u9664\u4e0e\u6807\u8bb0-\u538b\u7f29\u7684\u6df7\u5408\u5b9e\u73b0\u3002 <\/span><\/p>\n<div>\n<ol>\n<li><span style=\"color: #000000;\">Mark \u9636\u6bb5\u7684\u5f00\u9500\u4e0e\u5b58\u6d3b\u5bf9\u8c61\u7684\u6570\u91cf\u6210\u6b63\u6bd4\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">Sweep \u9636\u6bb5\u7684\u5f00\u9500\u4e0e\u6240\u7ba1\u7406\u533a\u57df\u7684\u5927\u5c0f\u6210\u6b63\u76f8\u5173\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">Compact \u9636\u6bb5\u7684\u5f00\u9500\u4e0e\u5b58\u6d3b\u5bf9\u8c61\u7684\u6570\u636e\u6210\u6b63\u6bd4\u3002 <\/span><\/li>\n<\/ol>\n<p><span style=\"color: #333333;\"><strong>\u5206\u4ee3\u7684\u601d\u60f3\u88ab\u73b0\u6709\u7684\u865a\u62df\u673a\u5e7f\u6cdb\u4f7f\u7528\u3002\u51e0\u4e4e\u6240\u6709\u7684\u5783\u573e\u56de\u6536\u5668\u90fd\u533a\u5206\u65b0\u751f\u4ee3\u548c\u8001<\/strong><strong>\u5e74\u4ee3\u3002<\/strong><\/span><\/p>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<h2 id=\"6.3%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%9B%B8%E5%85%B3%E6%A6%82%E5%BF%B5\"><span style=\"color: #000000;\"><strong>6.3 \u5783\u573e\u56de\u6536\u76f8\u5173\u6982\u5ff5<\/strong><\/span><\/h2>\n<h3 id=\"6.3.1System.gc()%20%E7%9A%84%E7%90%86%E8%A7%A3\"><span style=\"color: #000000;\"><strong>6.3.1System.gc() \u7684\u7406\u89e3<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u901a\u8fc7 System.gc()\u8005 Runtime.getRuntime().gc() \u7684\u8c03\u7528\uff0c\u4f1a\u663e\u5f0f\u89e6\u53d1 Full GC\uff0c\u540c\u65f6\u5bf9\u8001\u5e74\u4ee3\u548c\u65b0\u751f\u4ee3\u8fdb\u884c\u56de\u6536\uff0c\u5c1d\u8bd5\u91ca\u653e\u88ab\u4e22\u5f03\u5bf9\u8c61\u5360\u7528\u7684\u5185\u5b58\u3002<br \/>\n\u7136\u800c System.gc()\u8c03\u7528\u9644\u5e26\u4e00\u4e2a\u514d\u8d23\u58f0\u660e\uff0c\u65e0\u6cd5\u4fdd\u8bc1\u5bf9\u5783\u573e\u6536\u96c6\u5668\u7684\u8c03\u7528(\u4e0d\u80fd\u786e\u4fdd\u7acb\u5373\u751f\u6548)\u3002<br \/>\nJVM \u5b9e\u73b0\u8005\u53ef\u4ee5\u901a\u8fc7 System.gc() \u8c03\u7528\u6765\u51b3\u5b9a JVM \u7684 GC \u884c\u4e3a\u3002\u800c\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5783\u573e\u56de\u6536\u5e94\u8be5\u662f\u81ea\u52a8\u8fdb\u884c\u7684\uff0c\u65e0\u987b\u624b\u52a8\u89e6\u53d1\uff0c\u5426\u5219\u5c31\u592a\u8fc7\u4e8e\u9ebb\u70e6\u4e86\u3002\u5728\u4e00\u4e9b\u7279\u6b8a\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u8fd0\u884c\u4e4b\u95f4\u8c03\u7528 System.gc()\u3002<\/span><\/p>\n<h3 id=\"6.3.2%20%E5%86%85%E5%AD%98%E6%BA%A2%E5%87%BA%E4%B8%8E%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F\"><span style=\"color: #000000;\"><strong>6.3.2 \u5185\u5b58\u6ea2\u51fa\u4e0e\u5185\u5b58\u6cc4\u6f0f<\/strong><\/span><\/h3>\n<p><span style=\"color: #333333;\"><strong>\u5185\u5b58\u6ea2\u51fa<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5185\u5b58\u6ea2\u51fa\u76f8\u5bf9\u4e8e\u5185\u5b58\u6cc4\u6f0f\u6765\u8bf4\uff0c\u5c3d\u7ba1\u66f4\u5bb9\u6613\u88ab\u7406\u89e3\uff0c\u4f46\u662f\u540c\u6837\u7684\uff0c\u5185\u5b58\u6ea2\u51fa\u4e5f\u662f\u5f15\u53d1\u7a0b\u5e8f\u5d29\u6e83\u7684\u7f6a\u9b41\u7978\u9996\u4e4b\u4e00\u3002<br \/>\n\u7531\u4e8e GC \u4e00\u76f4\u5728\u53d1\u5c55\uff0c\u6240\u6709\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u9664\u975e\u5e94\u7528\u7a0b\u5e8f\u5360\u7528\u7684\u5185\u5b58\u589e\u957f\u901f\u5ea6\u975e\u5e38\u5feb\uff0c\u9020\u6210\u5783\u573e\u56de\u6536\u5df2\u7ecf\u8ddf\u4e0d\u4e0a\u5185\u5b58\u6d88\u8017\u7684\u901f\u5ea6\uff0c\u5426\u5219\u4e0d\u592a\u5bb9\u6613\u51fa\u73b0 OOM \u7684\u60c5\u51b5\u3002<br \/>\n\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0cGC \u4f1a\u8fdb\u884c\u5404\u79cd\u5e74\u9f84\u6bb5\u7684\u5783\u573e\u56de\u6536\uff0c\u5b9e\u5728\u4e0d\u884c\u4e86\u5c31\u653e\u5927\u62db\uff0c\u6765\u4e00\u6b21\u72ec\u5360\u5f0f\u7684 Full GC \u64cd\u4f5c\uff0c\u8fd9\u65f6\u5019\u4f1a\u56de\u6536\u5927\u91cf\u7684\u5185\u5b58\uff0c\u4f9b\u5e94\u7528\u7a0b\u5e8f\u7ee7\u7eed\u4f7f\u7528\u3002<br \/>\nJavadoc \u4e2d\u5bf9 OutofMemoryError \u7684\u89e3\u91ca\u662f\uff0c\u6ca1\u6709\u7a7a\u95f2\u5185\u5b58\uff0c\u5e76\u4e14\u5783\u573e\u6536\u96c6\u5668\u4e5f\u65e0\u6cd5\u63d0\u4f9b\u66f4\u591a\u5185\u5b58\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u5185\u5b58\u6cc4\u6f0f <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5185\u5b58\u6cc4\u6f0f\u4e5f\u79f0\u4f5c\u201c\u5b58\u50a8\u6e17\u6f0f\u201d\u3002\u4e25\u683c\u6765\u8bf4\uff0c\u53ea\u6709<strong>\u5bf9\u8c61\u4e0d\u4f1a\u518d\u88ab\u7a0b\u5e8f\u7528\u5230\u4e86\uff0c\u4f46<\/strong><\/span><span style=\"color: #000000;\"><strong>\u662f GC \u53c8\u4e0d\u80fd\u56de\u6536\u4ed6\u4eec\u7684\u60c5\u51b5<\/strong><\/span><span style=\"color: #000000;\">\uff0c\u624d\u53eb\u5185\u5b58\u6cc4\u6f0f\u3002<br \/>\n\u4f46\u5b9e\u9645\u60c5\u51b5\u5f88\u591a\u65f6\u5019\u4e00\u4e9b\u4e0d\u592a\u597d\u7684\u5b9e\u8df5\uff08\u6216\u758f\u5ffd\uff09\u4f1a\u5bfc\u81f4\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u53d8\u5f97\u5f88\u957f\u751a\u81f3\u5bfc\u81f4 OOM\uff0c\u4e5f\u53ef\u4ee5\u53eb\u505a\u5bbd\u6cdb\u610f\u4e49\u4e0a\u7684\u201c\u5185\u5b58\u6cc4\u6f0f\u201d\u3002<br \/>\n\u5c3d\u7ba1\u5185\u5b58\u6cc4\u6f0f\u5e76\u4e0d\u4f1a\u7acb\u523b\u5f15\u8d77\u7a0b\u5e8f\u5d29\u6e83\uff0c\u4f46\u662f\u4e00\u65e6\u53d1\u751f\u5185\u5b58\u6cc4\u6f0f\uff0c\u7a0b\u5e8f\u4e2d\u7684\u53ef\u7528\u5185\u5b58\u5c31\u4f1a\u88ab\u9010\u6b65\u8695\u98df\uff0c\u76f4\u81f3\u8017\u5c3d\u6240\u6709\u5185\u5b58\uff0c\u6700\u7ec8\u51fa\u73b0 OutofMemory \u5f02\u5e38\uff0c\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u3002\u6ce8\u610f\uff0c\u8fd9\u91cc\u7684\u5b58\u50a8\u7a7a\u95f4\u5e76\u4e0d\u662f\u6307\u7269\u7406\u5185\u5b58\uff0c\u800c\u662f\u6307\u865a\u62df\u5185\u5b58\u5927\u5c0f\uff0c\u8fd9\u4e2a\u865a\u62df\u5185\u5b58\u5927\u5c0f\u53d6\u51b3\u4e8e\u78c1\u76d8\u4ea4\u6362\u533a\u8bbe\u5b9a\u7684\u5927\u5c0f\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u6ce8\u610f\uff0c\u8fd9\u91cc\u7684\u5b58\u50a8\u7a7a\u95f4\u5e76\u4e0d\u662f\u6307\u7269\u7406\u5185\u5b58\uff0c\u800c\u662f\u6307\u865a\u62df\u5185\u5b58\u5927\u5c0f\uff0c\u8fd9\u4e2a\u865a\u62df\u5185\u5b58\u5927\u5c0f\u53d6\u51b3\u4e8e\u78c1\u76d8\u4ea4\u6362\u533a\u8bbe\u5b9a\u7684\u5927\u5c0f\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u5e38\u89c1\u4f8b\u5b50 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u5355\u4f8b\u6a21\u5f0f <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5355\u4f8b\u7684\u751f\u547d\u5468\u671f\u548c\u5e94\u7528\u7a0b\u5e8f\u662f\u4e00\u6837\u957f\u7684\uff0c\u6240\u4ee5\u5728\u5355\u4f8b\u7a0b\u5e8f\u4e2d\uff0c\u5982\u679c\u6301\u6709\u5bf9\u5916\u90e8\u5bf9\u8c61\u7684\u5f15\u7528\u7684\u8bdd\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5916\u90e8\u5bf9\u8c61\u662f\u4e0d\u80fd\u88ab\u56de\u6536\u7684\uff0c\u5219\u4f1a\u5bfc\u81f4\u5185\u5b58\u6cc4\u6f0f\u7684\u4ea7\u751f\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u4e00\u4e9b\u63d0\u4f9b close()\u7684\u8d44\u6e90\u672a\u5173\u95ed\u5bfc\u81f4\u5185\u5b58\u6cc4\u6f0f <\/strong><br \/>\n\u6570\u636e\u5e93\u8fde\u63a5 dataSourse.getConnection()\uff0c\u7f51\u7edc\u8fde\u63a5 socket \u548c io \u8fde\u63a5\u5fc5\u987b\u624b\u52a8 close\uff0c\u5426\u5219\u662f\u4e0d\u80fd\u88ab\u56de\u6536\u7684\u3002<\/span><\/p>\n<h3 id=\"6.3.3Stop%20the%20World\"><span style=\"color: #000000;\"><strong>6.3.3Stop the World <\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\"><strong>\u00a0 \u00a0 \u00a0 \u00a0Stop-the-World<\/strong>\uff0c\u7b80\u79f0 STW\uff0c\u6307\u7684\u662f GC \u4e8b\u4ef6\u53d1\u751f\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u4ea7\u751f\u5e94\u7528\u7a0b\u5e8f\u7684\u505c\u987f\u3002\u505c\u987f\u4ea7\u751f\u65f6\u6574\u4e2a\u5e94\u7528\u7a0b\u5e8f\u7ebf\u7a0b\u90fd\u4f1a\u88ab\u6682\u505c\uff0c\u6ca1\u6709\u4efb\u4f55\u54cd\u5e94\uff0c\u6709\u70b9\u50cf\u5361\u6b7b\u7684\u611f\u89c9\uff0c\u8fd9\u4e2a\u505c\u987f\u79f0\u4e3a STW\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5\u4e2d\u679a\u4e3e\u6839\u8282\u70b9\uff08GC Roots\uff09\u4f1a\u5bfc\u81f4\u6240\u6709 Java \u6267\u884c\u7ebf\u7a0b\u505c\u987f\uff0c\u4e3a\u4ec0\u4e48\u9700\u8981\u505c\u987f\u6240\u6709 Java \u6267\u884c\u7ebf\u7a0b\u5462\uff1f <\/span><\/p>\n<\/div>\n<div>\n<ol>\n<li><span style=\"color: #000000;\">\u5206\u6790\u5de5\u4f5c\u5fc5\u987b\u5728\u4e00\u4e2a\u80fd\u786e\u4fdd\u4e00\u81f4\u6027\u7684\u5feb\u7167\u4e2d\u8fdb\u884c <\/span><\/li>\n<li><span style=\"color: #000000;\">\u4e00\u81f4\u6027\u6307\u6574\u4e2a\u5206\u6790\u671f\u95f4\u6574\u4e2a\u6267\u884c\u7cfb\u7edf\u770b\u8d77\u6765\u50cf\u88ab\u51bb\u7ed3\u5728\u67d0\u4e2a\u65f6\u95f4\u70b9\u4e0a <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5982\u679c\u51fa\u73b0\u5206\u6790\u8fc7\u7a0b\u4e2d\u5bf9\u8c61\u5f15\u7528\u5173\u7cfb\u8fd8\u5728\u4e0d\u65ad\u53d8\u5316\uff0c\u5219\u5206\u6790\u7ed3\u679c\u7684\u51c6\u786e\u6027\u65e0\u6cd5\u4fdd<\/span><span style=\"color: #000000;\">\u8bc1,\u4f1a\u51fa\u73b0\u6f0f\u6807,\u9519\u6807\u95ee\u9898 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u88ab STW \u4e2d\u65ad\u7684\u5e94\u7528\u7a0b\u5e8f\u7ebf\u7a0b\u4f1a\u5728\u5b8c\u6210 GC \u4e4b\u540e\u6062\u590d\uff0c\u9891\u7e41\u4e2d\u65ad\u4f1a\u8ba9\u7528\u6237\u611f\u89c9<\/span><span style=\"color: #000000;\">\u50cf\u662f\u7f51\u901f\u4e0d\u5feb\u9020\u6210\u7535\u5f71\u5361\u5e26\u4e00\u6837\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u51cf\u5c11 STW \u7684\u53d1\u751f\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u8d8a\u4f18\u79c0\uff0c\u56de\u6536\u6548\u7387\u8d8a\u6765\u8d8a\u9ad8\uff0c\u5c3d\u53ef\u80fd\u5730\u7f29\u77ed\u4e86\u6682\u505c\u65f6\u95f4\u3002<\/span><\/li>\n<\/ol>\n<p><span style=\"color: #333333;\">\u00a0 \u00a0 \u00a0 \u00a0STW \u662f JVM \u5728\u540e\u53f0\u81ea\u52a8\u53d1\u8d77\u548c\u81ea\u52a8\u5b8c\u6210\u7684\u3002\u5728\u7528\u6237\u4e0d\u53ef\u89c1\u7684\u60c5\u51b5\u4e0b\uff0c\u628a\u7528\u6237\u6b63\u5e38\u7684\u5de5\u4f5c\u7ebf\u7a0b\u5168\u90e8\u505c\u6389\u3002<\/span><\/p>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<h2 id=\"6.4%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8\"><span style=\"color: #000000;\"><strong>6.4 \u5783\u573e\u56de\u6536\u5668 <\/strong><\/span><\/h2>\n<h3 id=\"6.4.1%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8%E6%A6%82%E8%BF%B0\"><span style=\"color: #000000;\"><strong>6.4.1 \u5783\u573e\u56de\u6536\u5668\u6982\u8ff0<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5982\u679c\u8bf4\u5783\u573e\u6536\u96c6\u7b97\u6cd5\u662f\u5185\u5b58\u56de\u6536\u7684\u65b9\u6cd5\u8bba,\u90a3\u4e48\u6536\u96c6\u5668\u5c31\u662f\u5185\u5b58\u56de\u6536\u7684\u5b9e\u8df5\u8005.<br \/>\n\u5783\u573e\u6536\u96c6\u5668\u6ca1\u6709\u5728 java \u865a\u62df\u673a\u89c4\u8303\u4e2d\u8fdb\u884c\u8fc7\u591a\u7684\u89c4\u5b9a\uff0c\u53ef\u4ee5\u7531\u4e0d\u540c\u7684\u5382\u5546\u3001\u4e0d\u540c\u7248\u672c\u7684 JVM \u6765\u5b9e\u73b0\u3002<br \/>\n\u7531\u4e8e JDK \u7684\u7248\u672c\u5904\u4e8e\u9ad8\u901f\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\uff0c\u56e0\u6b64 Java \u53d1\u5c55\u81f3\u4eca\u5df2\u7ecf\u884d\u751f\u4e86\u4f17\u591a\u7684\u5783\u573e\u56de\u6536\u5668\u3002\u4ece\u4e0d\u540c\u89d2\u5ea6\u5206\u6790\u5783\u573e\u6536\u96c6\u5668\uff0c\u53ef\u4ee5\u5c06 GC \u5206\u4e3a\u4e0d\u540c\u7684\u7c7b\u578b\u3002<br \/>\n\u5b9e\u9645\u4f7f\u7528\u65f6,\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u7684\u4f7f\u7528\u573a\u666f\u9009\u62e9\u4e0d\u540c\u7684\u5783\u573e\u56de\u6536\u5668,\u8fd9\u4e5f\u662f JVM \u8c03\u4f18\u7684\u91cd\u8981\u90e8<\/span><\/p>\n<h3 id=\"6.4.2%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8%E5%88%86%E7%B1%BB\"><span style=\"color: #000000;\"><strong>6.4.2 \u5783\u573e\u56de\u6536\u5668\u5206\u7c7b <\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\"><strong>\u6309\u7ebf\u7a0b\u6570\u53ef\u4ee5\u5206\u4e3a<\/strong><\/span><span style=\"color: #0000ff;\"><strong>\u5355\u7ebf\u7a0b(\u4e32\u884c)<\/strong><\/span><span style=\"color: #000000;\"><strong>\u5783\u573e\u56de\u6536\u5668\u548c<\/strong><\/span><span style=\"color: #0000ff;\"><strong>\u591a\u7ebf\u7a0b(\u5e76\u884c)<\/strong><\/span><span style=\"color: #000000;\"><strong>\u5783\u573e\u56de\u6536\u5668<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u5355\u7ebf\u7a0b\u5783\u573e\u56de\u6536\u5668(Serial) <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u8fdb\u884c\u5783\u573e\u56de\u6536,\u4f7f\u7528\u4e8e\u5c0f\u578b\u7b80\u5355\u7684\u4f7f\u7528\u573a\u666f,\u5783\u573e\u56de\u6536\u65f6,\u5176\u4ed6\u7528\u6237\u7ebf\u7a0b\u4f1a\u6682\u505c.<\/span><\/p>\n<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-20\/202307141358207a7a70f36.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"1182\" height=\"467\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-20\/202307141358207a7a70f36.png\" alt=\"\" width=\"1182\" height=\"467\" \/><\/noscript><\/div>\n<div><\/div>\n<div><\/div>\n<div><strong>\u591a\u7ebf\u7a0b\u5783\u573e\u56de\u6536\u5668(Parallel)<\/strong><\/div>\n<div>\n<div><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u591a\u7ebf\u7a0b\u5783\u573e\u56de\u6536\u5668\u5185\u90e8\u63d0\u4f9b\u591a\u4e2a\u7ebf\u7a0b\u8fdb\u884c\u5783\u573e\u56de\u6536,\u5728\u591a cpu \u60c5\u51b5\u4e0b\u5927\u5927\u63d0\u5347\u5783 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u573e\u56de\u6536\u6548\u7387,\u4f46\u540c\u6837\u4e5f\u662f\u4f1a\u6682\u505c\u5176\u4ed6\u7528\u6237\u7ebf\u7a0b.<\/span><\/div>\n<div><\/div>\n<\/div>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-21\/20230714135821ffff186bb.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"579\" height=\"280\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-21\/20230714135821ffff186bb.png\" alt=\"\" width=\"579\" height=\"280\" \/><\/noscript><\/p>\n<\/div>\n<p><span style=\"color: #000000;\"><strong>\u6309\u7167\u5de5\u4f5c\u6a21\u5f0f\u5206\uff0c\u53ef\u4ee5\u5206\u4e3a<\/strong><\/span><span style=\"color: #0000ff;\"><strong>\u72ec\u5360\u5f0f<\/strong><\/span><span style=\"color: #000000;\"><strong>\u548c<\/strong><\/span><span style=\"color: #0000ff;\"><strong>\u5e76\u53d1\u5f0f<\/strong><\/span><span style=\"color: #000000;\"><strong>\u5783\u573e\u56de\u6536\u5668\u3002<\/strong><\/span><\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-21\/20230714135821cdcddc7a6.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"466\" height=\"201\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-21\/20230714135821cdcddc7a6.png\" alt=\"\" width=\"466\" height=\"201\" \/><\/noscript><\/p>\n<p><span style=\"color: #000000;\"><strong>\u6309\u5de5\u4f5c\u7684\u5185\u5b58\u533a\u95f4\u5206\uff0c\u53c8\u53ef\u5206\u4e3a<\/strong><\/span><span style=\"color: #0000ff;\"><strong>\u5e74\u8f7b\u4ee3\u5783\u573e\u56de\u6536\u5668<\/strong><\/span><span style=\"color: #000000;\"><strong>\u548c<\/strong><\/span><span style=\"color: #0000ff;\"><strong>\u8001\u5e74\u4ee3\u5783\u573e\u56de\u6536\u5668\u3002<\/strong><\/span><\/p>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<h3 id=\"6.4.3GC%20%E6%80%A7%E8%83%BD%E6%8C%87%E6%A0%87\"><span style=\"color: #000000;\"><strong>6.4.3GC \u6027\u80fd\u6307\u6807<\/strong><\/span><\/h3>\n<\/div>\n<div>\n<div><span style=\"color: #000000;\"><strong>\u541e\u5410\u91cf\uff1a\u8fd0\u884c\u7528\u6237\u4ee3\u7801\u7684\u65f6\u95f4\u5360\u603b\u8fd0\u884c\u65f6\u95f4\u7684\u6bd4\u4f8b<\/strong><\/span><\/div>\n<div><span style=\"color: #000000;\">\uff08\u603b\u8fd0\u884c\u65f6\u95f4\uff1a\u7a0b\u5e8f\u7684\u8fd0\u884c\u65f6\u95f4+<\/span> <span style=\"color: #000000;\">\u5185\u5b58\u56de\u6536\u7684\u65f6\u95f4\uff09 <\/span><\/div>\n<ul>\n<li><span style=\"color: #000000;\">\u5783\u573e\u6536\u96c6\u5f00\u9500\uff1a\u5783\u573e\u6536\u96c6\u6240\u7528\u65f6\u95f4\u4e0e\u603b\u8fd0\u884c\u65f6\u95f4\u7684\u6bd4\u4f8b\u3002 <\/span><\/li>\n<\/ul>\n<div><span style=\"color: #000000;\"><strong>\u6682\u505c\u65f6\u95f4\uff1a\u6267\u884c\u5783\u573e\u6536\u96c6\u65f6\uff0c\u7a0b\u5e8f\u7684\u5de5\u4f5c\u7ebf\u7a0b\u88ab\u6682\u505c\u7684\u65f6\u95f4\u3002 <\/strong><\/span><\/div>\n<ul>\n<li><span style=\"color: #000000;\">\u5185\u5b58\u5360\u7528\uff1a<\/span><span style=\"color: #000000;\">Java <\/span><span style=\"color: #000000;\">\u5806\u533a\u6240\u5360\u7684\u5185\u5b58\u5927\u5c0f\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5feb\u901f\uff1a\u4e00\u4e2a\u5bf9\u8c61\u4ece\u8bde\u751f\u5230\u88ab\u56de\u6536\u6240\u7ecf\u5386\u7684\u65f6\u95f4\u3002<\/span><\/li>\n<\/ul>\n<\/div>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-22\/202307141358221d1d7e822.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"476\" height=\"300\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-22\/202307141358221d1d7e822.png\" alt=\"\" width=\"476\" height=\"300\" \/><\/noscript><\/p>\n<\/div>\n<div>\n<h3 id=\"6.4.4HotSpot%20%E5%9E%83%E5%9C%BE%E6%94%B6%E9%9B%86%E5%99%A8\"><span style=\"color: #000000;\"><strong>6.4.4HotSpot \u5783\u573e\u6536\u96c6\u5668<\/strong><\/span><\/h3>\n<\/div>\n<div><\/div>\n<div>\n<blockquote>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u56fe\u4e2d\u5c55\u793a\u4e86 7 \u79cd\u4f5c\u7528\u4e8e\u4e0d\u540c\u5206\u4ee3\u7684\u6536\u96c6\u5668\uff0c\u5982\u679c\u4e24\u4e2a\u6536\u96c6\u5668\u4e4b\u95f4\u5b58\u5728\u8fde\u7ebf\uff0c\u5219\u8bf4\u660e\u5b83\u4eec\u53ef\u4ee5\u642d\u914d\u4f7f\u7528\u3002\u865a\u62df\u673a\u6240\u5904\u7684\u533a\u57df\u5219\u8868\u793a\u5b83\u662f\u5c5e\u4e8e\u65b0\u751f\u4ee3\u8fd8\u662f\u8001\u5e74\u4ee3\u6536\u96c6\u5668\u3002<\/span><\/div>\n<\/blockquote>\n<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-22\/202307141358226868f162d.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"1087\" height=\"446\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-22\/202307141358226868f162d.png\" alt=\"\" width=\"1087\" height=\"446\" \/><\/noscript><\/div>\n<div><\/div>\n<div>\n<h3 id=\"6.%204.5CMS%20%E5%9B%9E%E6%94%B6%E5%99%A8\"><span style=\"color: #000000;\"><strong>6. 4.5CMS <\/strong><\/span><span style=\"color: #000000;\"><strong>\u56de\u6536\u5668<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\"><strong>CMS <\/strong><\/span><span style=\"color: #000000;\"><strong>\u6982\u8ff0 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>CMS<\/strong>(Concurrent Mark Sweep\uff0c\u5e76\u53d1\u6807\u8bb0\u6e05\u9664)\u6536\u96c6\u5668\u662f\u4ee5\u83b7\u53d6\u6700\u77ed\u56de\u6536\u505c\u987f\u65f6\u95f4\u4e3a\u76ee\u6807\u7684\u6536\u96c6\u5668\uff08<\/span><span style=\"color: #0000ff;\">\u8ffd\u6c42\u4f4e\u505c\u987f<\/span><span style=\"color: #000000;\">\uff09\uff0c\u5b83\u5728\u5783\u573e\u6536\u96c6\u65f6\u4f7f\u5f97\u7528\u6237\u7ebf\u7a0b\u548c GC \u7ebf\u7a0b\u5e76\u53d1\u6267\u884c\uff0c\u56e0\u6b64\u5728\u5783\u573e\u6536\u96c6\u8fc7\u7a0b\u4e2d\u7528\u6237\u4e5f\u4e0d\u4f1a\u611f\u5230\u660e\u663e\u7684\u5361\u987f\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u5783\u573e\u56de\u6536\u8fc7\u7a0b <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u521d\u59cb\u6807\u8bb0\uff1a<br \/>\nStop The World\uff0c\u4ec5\u4f7f\u7528\u4e00\u6761\u521d\u59cb\u6807\u8bb0\u7ebf\u7a0b\u5bf9\u6240\u6709\u4e0e GC Roots \u76f4\u63a5\u5173\u8054\u7684\u5bf9\u8c61\u8fdb\u884c\u6807\u8bb0\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u5e76\u53d1\u6807\u8bb0\uff1a<br \/>\n\u5783\u573e\u56de\u6536\u7ebf\u7a0b\uff0c\u4e0e\u7528\u6237\u7ebf\u7a0b\u5e76\u53d1\u6267\u884c\u3002\u6b64\u8fc7\u7a0b\u8fdb\u884c\u53ef\u8fbe\u6027\u5206\u6790\uff0c\u6807\u8bb0\u51fa\u6240\u6709\u5e9f\u5f03\u5bf9\u8c61\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u91cd\u65b0\u6807\u8bb0\uff1a<br \/>\nStop The World\uff0c\u4f7f\u7528\u591a\u6761\u6807\u8bb0\u7ebf\u7a0b\u5e76\u53d1\u6267\u884c\uff0c\u5c06\u521a\u624d\u5e76\u53d1\u6807\u8bb0\u8fc7\u7a0b\u4e2d\u65b0\u51fa\u73b0\u7684\u5e9f\u5f03\u5bf9\u8c61\u6807\u8bb0\u51fa\u6765\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5e76\u53d1\u6e05\u9664\uff1a<br \/>\n\u53ea\u4f7f\u7528\u4e00\u6761 GC \u7ebf\u7a0b\uff0c\u4e0e\u7528\u6237\u7ebf\u7a0b\u5e76\u53d1\u6267\u884c\uff0c\u6e05\u9664\u521a\u624d\u6807\u8bb0\u7684\u5bf9\u8c61\u3002 \u8fd9\u4e2a\u8fc7\u7a0b\u975e\u5e38\u8017\u65f6\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5e76\u53d1\u6807\u8bb0\u4e0e\u5e76\u53d1\u6e05\u9664\u8fc7\u7a0b\u8017\u65f6\u6700\u957f\uff0c\u4e14\u53ef\u4ee5\u4e0e\u7528\u6237\u7ebf\u7a0b\u4e00\u8d77\u5de5\u4f5c\uff0c\u56e0\u6b64\uff0c\u603b\u4f53\u4e0a \u8bf4\uff0cCMS \u6536\u96c6\u5668\u7684\u5185\u5b58\u56de\u6536\u8fc7\u7a0b\u662f\u4e0e\u7528\u6237\u7ebf\u7a0b\u4e00\u8d77\u5e76\u53d1\u6267\u884c\u7684\u3002<\/span><\/p>\n<\/div>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-23\/20230714135823c2c2a2558.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"599\" height=\"248\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-23\/20230714135823c2c2a2558.png\" alt=\"\" width=\"599\" height=\"248\" \/><\/noscript><\/p>\n<p><span style=\"color: #000000;\"><strong>CMS \u7684\u4f18\u70b9\uff1a <\/strong><br \/>\n\u53ef\u4ee5\u4f5c\u5230\u5e76\u53d1\u6536\u96c6 <\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>CMS \u7684\u5f0a\u7aef\uff1a <\/strong><\/span><\/p>\n<ol>\n<li><span style=\"color: #000000;\">CMS \u662f\u57fa\u4e8e\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u6765\u5b9e\u73b0\u7684,\u4f1a\u4ea7\u751f\u5185\u5b58\u788e\u7247\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">CMS \u5728\u5e76\u53d1\u9636\u6bb5\uff0c\u5b83\u867d\u7136\u4e0d\u4f1a\u5bfc\u81f4\u7528\u6237\u7ebf\u7a0b\u505c\u987f\uff0c\u4f46\u662f\u4f1a\u56e0\u4e3a\u5360\u7528\u4e86\u4e00\u90e8\u5206\u7ebf\u7a0b\u800c\u5bfc\u81f4\u5e94\u7528\u7a0b\u5e8f\u53d8\u6162\uff0c\u603b\u541e\u5410\u91cf\u4f1a\u964d\u4f4e\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">CMS \u6536\u96c6\u5668\u65e0\u6cd5\u5904\u7406\u6d6e\u52a8\u5783\u573e\uff08floating garbage\uff09\u3002<\/span><\/li>\n<\/ol>\n<\/div>\n<p><span style=\"color: #000000;\"><strong>\u4e09\u8272\u6807\u8bb0\u7b97\u6cd5<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4e3a\u4e86\u63d0\u9ad8 JVM \u5783\u573e\u56de\u6536\u7684\u6027\u80fd\uff0c\u4ece CMS \u5783\u573e\u6536\u96c6\u5668\u5f00\u59cb\uff0c\u5f15\u5165\u4e86\u5e76\u53d1\u6807\u8bb0\u7684\u6982\u5ff5\u3002\u5f15\u5165\u5e76\u53d1\u6807\u8bb0\u7684\u8fc7\u7a0b\u5c31\u4f1a\u5e26\u6765\u4e00\u4e2a\u95ee\u9898\uff0c\u5728\u4e1a\u52a1\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u5bf9\u73b0\u6709\u7684\u5f15\u7528\u5173\u7cfb\u94fe\u51fa\u73b0\u6539\u53d8\u3002 <\/span><\/p>\n<div><span style=\"color: #000000;\">\u4e09\u8272\u6807\u8bb0\u6cd5\u5c06\u5bf9\u8c61\u7684\u989c\u8272\u5206\u4e3a\u4e86\u9ed1\u3001\u7070\u3001\u767d\uff0c\u4e09\u79cd\u989c\u8272\u3002<\/span><\/div>\n<div>\n<ul>\n<li><span style=\"color: #000000;\"><strong>\u9ed1\u8272<\/strong><\/span><span style=\"color: #000000;\">:\u8be5\u5bf9\u8c61\u5df2\u7ecf\u88ab\u6807\u8bb0\u8fc7\u4e86\uff0c\u4e14\u8be5\u5bf9\u8c61\u4e0b\u7684\u5c5e\u6027\u4e5f\u5168\u90e8\u90fd\u88ab\u6807\u8bb0\u8fc7\u4e86,\u4f8b\u5982GCRoots \u5bf9\u8c61\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u7070\u8272<\/strong><\/span><span style=\"color: #000000;\">:\u5bf9\u8c61\u5df2\u7ecf\u88ab\u5783\u573e\u6536\u96c6\u5668\u626b\u63cf\u8fc7\u4e86\uff0c\u4f46\u662f\u5bf9\u8c61\u4e2d\u8fd8\u5b58\u5728\u6ca1\u6709\u626b\u63cf\u7684\u5f15\u7528(GC\u9700\u8981\u4ece\u6b64\u5bf9\u8c61\u4e2d\u53bb\u5bfb\u627e\u5783\u573e); <\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u767d\u8272<\/strong><\/span><span style=\"color: #000000;\">:\u8868\u793a\u5bf9\u8c61\u6ca1\u6709\u88ab\u5783\u573e\u6536\u96c6\u5668\u8bbf\u95ee\u8fc7\uff0c\u5373\u8868\u793a\u4e0d\u53ef\u8fbe.<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #333333;\"><strong>\u4e09\u8272\u6807\u8bb0\u7684\u8fc7\u7a0b:<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u4e3a\u4e86\u89e3\u51b3\u5e76\u53d1\u7684\u95ee\u9898\uff0c\u5f15\u5165\u4e2d\u95f4\u72b6\u6001(\u7070\u8272)\uff0c\u5f53\u4e00\u4e2a\u5bf9\u8c61\u88ab\u6807\u8bb0\u7684\u65f6\u5019\uff0c\u4f1a\u6709\u4e0b\u9762\u51e0\u4e2a\u8fc7\u7a0b\uff1a <\/span><\/p>\n<\/div>\n<div>\n<ol>\n<li><span style=\"color: #000000;\">\u521a\u5f00\u59cb\uff0c\u786e\u5b9a\u4e3a GC Roots \u7684\u5bf9\u8c61\u4e3a\u9ed1\u8272\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5c06 GC Roots \u76f4\u63a5\u5173\u8054\u7684\u5bf9\u8c61\u7f6e\u4e3a\u7070\u8272\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u904d\u5386\u7070\u8272\u5bf9\u8c61\u7684\u6240\u6709\u5f15\u7528\uff0c\u7070\u8272\u5bf9\u8c61\u672c\u8eab\u7f6e\u4e3a\u9ed1\u8272\uff0c\u5176\u5f15\u7528\u7f6e\u4e3a\u7070\u8272\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u91cd\u590d\u6b65\u9aa4 3\uff0c\u76f4\u5230\u6ca1\u6709\u7070\u8272\u5bf9\u8c61\u4e3a\u6b62\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u00a0\u7ed3\u675f\u65f6\uff0c\u9ed1\u8272\u5bf9\u8c61\u5b58\u6d3b\uff0c\u767d\u8272\u5bf9\u8c61\u56de\u6536\u3002<\/span><\/li>\n<\/ol>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u8fd9\u4e2a\u8fc7\u7a0b\u6b63\u786e\u6267\u884c\u7684\u524d\u63d0\u662f\u6ca1\u6709\u5176\u4ed6\u7ebf\u7a0b\u6539\u53d8\u5bf9\u8c61\u95f4\u7684\u5f15\u7528\u5173\u7cfb\uff0c\u7136\u800c\uff0c\u5e76\u53d1\u6807\u8bb0\u7684\u8fc7\u7a0b\u4e2d\uff0c\u7528\u6237\u7ebf\u7a0b\u4ecd\u5728\u8fd0\u884c\uff0c\u56e0\u6b64\u5c31\u4f1a\u4ea7\u751f\u6f0f\u6807\u548c\u9519\u6807\u7684\u60c5\u51b5\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u6f0f\u6807<\/strong> <\/span><\/p>\n<p><span style=\"color: #000000;\">\u5047\u8bbe GC \u5df2\u7ecf\u5728\u904d\u5386\u5bf9\u8c61 B \u4e86\uff0c\u800c\u6b64\u65f6\u7528\u6237\u7ebf\u7a0b\u6267\u884c\u4e86 A.B=null \u7684\u64cd\u4f5c\uff0c\u5207\u65ad\u4e86 A \u5230 B \u7684\u5f15\u7528<\/span><\/p>\n<\/div>\n<div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-23\/20230714135823c8c8e6240.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"428\" height=\"216\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-23\/20230714135823c8c8e6240.png\" alt=\"\" width=\"428\" height=\"216\" \/><\/noscript><\/p>\n<div><span style=\"color: #000000;\">\u672c\u6765\u6267\u884c\u4e86 A.B=null \u4e4b\u540e\uff0cB\u3001D\u3001E \u90fd\u53ef\u4ee5\u88ab\u56de\u6536\u4e86\uff0c\u4f46\u662f\u7531\u4e8e B \u5df2\u7ecf\u53d8\u4e3a\u7070\u8272\uff0c\u5b83\u4ecd\u4f1a\u88ab\u5f53\u505a\u5b58\u6d3b\u5bf9\u8c61\uff0c\u7ee7\u7eed\u904d\u5386\u4e0b\u53bb\u3002\u6700\u7ec8\u7684\u7ed3\u679c\u5c31\u662f\u672c\u8f6e GC \u4e0d\u4f1a\u56de\u6536 B\u3001D\u3001E\uff0c\u7559\u5230\u4e0b\u6b21 GC \u65f6\u56de\u6536\uff0c\u4e5f\u7b97\u662f\u6d6e\u52a8\u5783\u573e\u7684\u4e00\u90e8\u5206\u3002 <\/span><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><strong><span style=\"color: #000000;\">\u9519\u6807 <\/span><\/strong><\/div>\n<div><span style=\"color: #000000;\">\u5047\u8bbe GC \u7ebf\u7a0b\u5df2\u7ecf\u904d\u5386\u5230 B \u4e86\uff0c\u6b64\u65f6\u7528\u6237\u7ebf\u7a0b\u6267\u884c\u4e86\u4ee5\u4e0b\u64cd\u4f5c\uff1a <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0B.D=null;\/\/B \u5230 D \u7684\u5f15\u7528\u88ab\u5207\u65ad <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0A.xx=D;\/\/A \u5230 D \u7684\u5f15\u7528\u88ab\u5efa\u7acb<\/span><\/div>\n<\/div>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-24\/20230714135824454549dbc.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"478\" height=\"219\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-24\/20230714135824454549dbc.png\" alt=\"\" width=\"478\" height=\"219\" \/><\/noscript><\/p>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0B \u5230 D \u7684\u5f15\u7528\u88ab\u5207\u65ad\uff0c\u4e14 A \u5230 D \u7684\u5f15\u7528\u88ab\u5efa\u7acb\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u6b64\u65f6 GC \u7ebf\u7a0b\u7ee7\u7eed\u5de5\u4f5c\uff0c\u7531\u4e8e B \u4e0d\u518d\u5f15\u7528 D \u4e86\uff0c\u5c3d\u7ba1 A \u53c8\u5f15\u7528\u4e86 D\uff0c\u4f46\u662f\u56e0\u4e3a A \u5df2\u7ecf\u6807\u8bb0\u4e3a\u9ed1\u8272\uff0cGC \u4e0d\u4f1a\u518d\u904d\u5386 A \u4e86\uff0c\u6240\u4ee5 D \u4f1a\u88ab\u6807\u8bb0\u4e3a\u767d\u8272\uff0c\u6700\u540e\u88ab\u5f53\u505a\u5783\u573e\u56de\u6536\u3002 <\/span><\/div>\n<div><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u53ef\u4ee5\u770b\u5230\u9519\u6807\u7684\u7ed3\u679c\u6bd4\u6f0f\u8868\u4e25\u91cd\u7684\u591a\uff0c\u6d6e\u52a8\u5783\u573e\u53ef\u4ee5\u4e0b\u6b21 GC \u6e05\u7406\uff0c\u800c\u628a\u4e0d\u8be5\u56de\u6536\u7684\u5bf9\u8c61\u56de\u6536\u6389\uff0c\u5c06\u4f1a\u9020\u6210\u7a0b\u5e8f\u8fd0\u884c\u9519\u8bef\u3002<\/span><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<div><span style=\"color: #0d0016;\"><strong>\u89e3\u51b3\u9519\u6807\u7684\u95ee\u9898 <\/strong><\/span><\/div>\n<div><\/div>\n<div><span style=\"color: #000000;\">\u9519\u6807\u53ea\u6709\u5728\u6ee1\u8db3\u4e0b\u9762\u4e24\u79cd\u60c5\u51b5\u4e0b\u624d\u4f1a\u53d1\u751f\uff1a<\/span><\/div>\n<div><\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-24\/20230714135824636391cee.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"1057\" height=\"292\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-24\/20230714135824636391cee.png\" alt=\"\" width=\"1057\" height=\"292\" \/><\/noscript><\/div>\n<p><span style=\"color: #000000;\">\u53ea\u8981\u6253\u7834\u4efb\u4e00\u6761\u4ef6\uff0c\u5c31\u53ef\u4ee5\u89e3\u51b3\u9519\u6807\u7684\u95ee\u9898\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u539f\u59cb\u5feb\u7167\u548c\u589e\u91cf\u66f4\u65b0 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u539f\u59cb\u5feb\u7167<\/strong><\/span><span style=\"color: #000000;\">\u6253\u7834\u7684\u662f\u7b2c\u4e00\u4e2a\u6761\u4ef6\uff1a\u5f53\u7070\u8272\u5bf9\u8c61\u6307\u5411\u767d\u8272\u5bf9\u8c61\u7684\u5f15\u7528\u88ab\u65ad\u5f00\u65f6\uff0c\u5c31\u5c06\u8fd9\u6761\u5f15\u7528\u5173\u7cfb\u8bb0\u5f55\u4e0b\u6765\u3002\u5f53\u626b\u63cf\u7ed3\u675f\u540e\uff0c\u518d\u4ee5\u8fd9\u4e9b\u7070\u8272\u5bf9\u8c61\u4e3a\u6839\uff0c\u91cd\u65b0\u626b\u63cf\u4e00\u6b21\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u589e\u91cf\u66f4\u65b0<\/strong><\/span><span style=\"color: #000000;\">\u6253\u7834\u7684\u662f\u7b2c\u4e8c\u4e2a\u6761\u4ef6\uff1a\u5f53\u9ed1\u8272\u6307\u5411\u767d\u8272\u7684\u5f15\u7528\u88ab\u5efa\u7acb\u65f6\uff0c\u5c31\u5c06\u8fd9\u4e2a\u65b0\u7684\u5f15\u7528\u5173\u7cfb\u8bb0\u5f55\u4e0b\u6765\uff0c\u7b49\u626b\u63cf\u7ed3\u675f\u540e\uff0c\u518d\u4ee5\u8fd9\u4e9b\u8bb0\u5f55\u4e2d\u7684\u9ed1\u8272\u5bf9\u8c61\u4e3a\u6839\uff0c\u91cd\u65b0\u626b\u63cf\u4e00\u6b21\u3002\u76f8\u5f53\u4e8e\u9ed1\u8272\u5bf9\u8c61\u4e00\u65e6\u5efa\u7acb\u4e86\u6307\u5411\u767d\u8272\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u5c31\u4f1a\u53d8\u4e3a\u7070\u8272\u5bf9\u8c61\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u603b\u7ed3 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0CMS \u4e3a\u4e86\u8ba9 GC \u7ebf\u7a0b\u548c\u7528\u6237\u7ebf\u7a0b\u4e00\u8d77\u5de5\u4f5c\uff0c\u56de\u6536\u7684\u7b97\u6cd5\u548c\u8fc7\u7a0b\u6bd4\u4ee5\u524d\u65e7\u7684\u6536\u96c6\u5668\u8981\u590d\u6742\u5f88\u591a\u3002\u7a76\u5176\u539f\u56e0\uff0c\u5c31\u662f\u56e0\u4e3a GC \u6807\u8bb0\u5bf9\u8c61\u7684\u540c\u65f6\uff0c\u7528\u6237\u7ebf\u7a0b\u8fd8\u5728\u4fee\u6539\u5bf9\u8c61\u7684\u5f15\u7528\u5173\u7cfb\u3002\u56e0\u6b64 CMS \u5f15\u5165\u4e86\u4e09\u8272\u7b97\u6cd5\uff0c\u5c06\u5bf9\u8c61\u6807\u8bb0\u4e3a\u9ed1\u3001\u7070\u3001\u767d\u4e09\u79cd\u989c\u8272\u7684\u5bf9\u8c61\uff0c\u5c06\u7528\u6237\u7ebf\u7a0b\u4fee\u6539\u7684\u5f15\u7528\u5173\u7cfb\u8bb0\u5f55\u4e0b\u6765\uff0c\u4ee5\u4fbf\u5728\u300c\u91cd\u65b0\u6807\u8bb0\u300d\u9636\u6bb5\u53ef\u4ee5\u4fee\u6b63\u5bf9\u8c61\u7684\u5f15\u7528\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u867d\u7136 CMS \u4ece\u6765\u6ca1\u6709\u88ab JDK \u5f53\u505a\u9ed8\u8ba4\u7684\u5783\u573e\u6536\u96c6\u5668\uff0c\u5b58\u5728\u5f88\u591a\u7684\u7f3a\u70b9\uff0c\u4f46\u662f\u5b83\u5f00\u542f\u4e86\u300cGC \u5e76\u53d1\u6536\u96c6\u300d\u7684\u5148\u6cb3\uff0c\u4e3a\u540e\u9762\u7684\u6536\u96c6\u5668\u63d0\u4f9b\u4e86\u601d\u8def\u3002<\/span><\/p>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<h3 id=\"6.4.6G1(Garbage%20First)%E5%9B%9E%E6%94%B6%E5%99%A8\"><span style=\"color: #000000;\"><strong>6.4.6G1(Garbage First)<\/strong><\/span><span style=\"color: #000000;\"><strong>\u56de\u6536\u5668<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\"><strong>\u65e2\u7136\u6211\u4eec\u5df2\u7ecf\u6709\u4e86\u524d\u9762\u51e0\u4e2a\u5f3a\u5927\u7684 GC\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u8981\u53d1\u5e03 Garbage First\uff08G1\uff09<\/strong><\/span><span style=\"color: #000000;\"><strong>GC\uff1f <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u539f\u56e0\u5c31\u5728\u4e8e\u5e94\u7528\u7a0b\u5e8f\u6240\u5e94\u5bf9\u7684\u4e1a\u52a1\u8d8a\u6765\u8d8a\u5e9e\u5927\u3001\u590d\u6742\uff0c\u7528\u6237\u8d8a\u6765\u8d8a\u591a\uff0c\u6ca1\u6709GC \u5c31\u4e0d\u80fd\u4fdd\u8bc1\u5e94\u7528\u7a0b\u5e8f\u6b63\u5e38\u8fdb\u884c\uff0c\u800c\u7ecf\u5e38\u9020\u6210 STW \u7684 GC \u53c8\u8ddf\u4e0d\u4e0a\u5b9e\u9645\u7684\u9700\u6c42\uff0c\u6240\u4ee5\u624d\u4f1a\u4e0d\u65ad\u5730\u5c1d\u8bd5\u5bf9 GC \u8fdb\u884c\u4f18\u5316\u3002G1\uff08Garbage-First\uff09\u5783\u573e\u56de\u6536\u5668\u662f\u5728 Java7 update 4 \u4e4b\u540e\u5f15\u5165\u7684\u4e00\u4e2a\u65b0\u7684\u5783\u573e\u56de\u6536\u5668\uff0c\u662f\u5f53\u4eca\u6536\u96c6\u5668\u6280\u672f\u53d1\u5c55\u7684\u6700\u524d\u6cbf\u6210\u679c\u4e4b\u4e00. <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u4e0e\u6b64\u540c\u65f6\uff0c\u4e3a\u4e86\u9002\u5e94\u73b0\u5728\u4e0d\u65ad\u6269\u5927\u7684\u5185\u5b58\u548c\u4e0d\u65ad\u589e\u52a0\u7684\u5904\u7406\u5668\u6570\u91cf\uff0c\u8fdb\u4e00\u6b65\u964d\u4f4e\u6682\u505c\u65f6\u95f4\uff08pause time\uff09\uff0c\u540c\u65f6\u517c\u987e\u826f\u597d\u7684\u541e\u5410\u91cf\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u5b98\u65b9\u7ed9 G1 \u8bbe\u5b9a\u7684\u76ee\u6807\u662f\u5728\u5ef6\u8fdf\u53ef\u63a7\u7684\u60c5\u51b5\u4e0b\u83b7\u5f97\u5c3d\u53ef\u80fd\u9ad8\u7684\u541e\u5410\u91cf\uff0c\u6240\u4ee5\u624d\u62c5\u5f53\u8d77\u201c\u5168\u529f\u80fd\u6536\u96c6\u5668\u201d\u7684\u91cd\u4efb\u4e0e\u671f\u671b\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">G1 \u662f\u4e00\u6b3e\u9762\u5411\u670d\u52a1\u7aef\u5e94\u7528\u7684\u5783\u573e\u6536\u96c6\u5668\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u4e3a\u4ec0\u4e48\u540d\u5b57\u53eb\u505a Garbage First\uff08G1\uff09\u5462\uff1f<\/strong><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-25\/20230714135825e8e873427.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"1059\" height=\"342\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-25\/20230714135825e8e873427.png\" alt=\"\" width=\"1059\" height=\"342\" \/><\/noscript><\/p>\n<p><span style=\"color: #000000;\">\u56e0\u4e3a G1 \u662f\u4e00\u4e2a\u5e76\u884c\u56de\u6536\u5668\uff0c\u5b83\u628a\u5806\u5185\u5b58\u5206\u5272\u4e3a\u5f88\u591a\u4e0d\u76f8\u5173\u7684\u533a\u57df\uff08Region\uff09\uff08\u7269\u7406\u4e0a\u4e0d\u8fde\u7eed\u7684\u903b\u8f91\u4e0a\u8fde\u7eed\u7684\uff09\u3002\u4f7f\u7528\u4e0d\u540c\u7684 Region \u6765\u8868\u793a Eden\u3001\u5e78\u5b58\u80050 \u533a\uff0c\u5e78\u5b58\u8005 1 \u533a\uff0c\u8001\u5e74\u4ee3\u7b49\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0G1 GC \u6709\u8ba1\u5212\u5730\u907f\u514d\u5728\u6574\u4e2a Java \u5806\u4e2d\u8fdb\u884c\u5168\u533a\u57df\u7684\u5783\u573e\u6536\u96c6\u3002G1 \u8ddf\u8e2a\u5404\u4e2a Region \u91cc\u9762\u7684\u5783\u573e\u5806\u79ef\u7684\u4ef7\u503c\u5927\u5c0f\uff08\u56de\u6536\u6240\u83b7\u5f97\u7684\u7a7a\u95f4\u5927\u5c0f\u4ee5\u53ca\u56de\u6536\u6240\u9700\u65f6\u95f4\u7684\u7ecf\u9a8c\u503c\uff09\uff0c\u5728\u540e\u53f0\u7ef4\u62a4\u4e00\u4e2a\u4f18\u5148\u5217\u8868\uff0c\u6bcf\u6b21\u6839\u636e\u5141\u8bb8\u7684\u6536\u96c6\u65f6\u95f4\uff0c\u4f18\u5148\u56de\u6536\u4ef7\u503c\u6700\u5927\u7684 Region. <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0\u7531\u4e8e\u8fd9\u79cd\u65b9\u5f0f\u7684\u4fa7\u91cd\u70b9\u5728\u4e8e\u56de\u6536\u5783\u573e\u6700\u5927\u91cf\u7684\u533a\u95f4\uff08Region\uff09\uff0c\u6240\u4ee5\u6211\u4eec\u7ed9 G1 \u4e00\u4e2a\u540d\u5b57\uff1a\u5783\u573e\u4f18\u5148\uff08Garbage First\uff09\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0G1\uff08Garbage-First\uff09\u662f\u4e00\u6b3e\u9762\u5411\u670d\u52a1\u7aef\u5e94\u7528\u7684\u5783\u573e\u6536\u96c6\u5668\uff0c\u4e3b\u8981\u9488\u5bf9\u914d\u5907\u591a\u6838 CPU \u53ca\u5927\u5bb9\u91cf\u5185\u5b58\u7684\u673a\u5668\uff0c\u4ee5\u6781\u9ad8\u6982\u7387\u6ee1\u8db3 GC \u505c\u987f\u65f6\u95f4\u7684\u540c\u65f6\uff0c\u8fd8\u517c\u5177\u9ad8\u541e\u5410\u91cf\u7684\u6027\u80fd\u7279\u5f81\u3002 <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u5982\u4e0b\u56fe\u6240\u793a\uff0cG1 \u6536\u96c6\u5668\u6536\u96c6\u5668\u6536\u96c6\u8fc7\u7a0b\u6709\u521d\u59cb\u6807\u8bb0\u3001\u5e76\u53d1\u6807\u8bb0\u3001\u6700\u7ec8\u6807\u8bb0\u3001\u7b5b\u9009\u56de\u6536\uff0c\u548c CMS \u6536\u96c6\u5668\u524d\u51e0\u6b65\u7684\u6536\u96c6\u8fc7\u7a0b\u5f88\u76f8\u4f3c\uff1a<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-25\/20230714135825f4f449daf.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\" width=\"954\" height=\"344\" \/><noscript><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-58-25\/20230714135825f4f449daf.png\" alt=\"\" width=\"954\" height=\"344\" \/><\/noscript><\/p>\n<ol>\n<li><span style=\"color: #000000;\">\u521d\u59cb\u6807\u8bb0\uff1a\u6807\u8bb0\u51fa GC Roots \u76f4\u63a5\u5173\u8054\u7684\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u9636\u6bb5\u901f\u5ea6\u8f83\u5feb\uff0c\u9700\u8981\u505c\u6b62\u7528\u6237\u7ebf\u7a0b\uff0c\u5355\u7ebf\u7a0b\u6267\u884c\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u5e76\u53d1\u6807\u8bb0\uff1a\u4ece GC Root \u5f00\u59cb\u5bf9\u5806\u4e2d\u7684\u5bf9\u8c61\u8fdb\u884c\u53ef\u8fbe\u65b0\u5206\u6790\uff0c\u627e\u51fa\u5b58\u6d3b\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u9636\u6bb5\u8017\u65f6\u8f83\u957f\uff0c\u4f46\u53ef\u4ee5\u548c\u7528\u6237\u7ebf\u7a0b\u5e76\u53d1\u6267\u884c\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u6700\u7ec8\u6807\u8bb0\uff1a\u4fee\u6b63\u5728\u5e76\u53d1\u6807\u8bb0\u9636\u6bb5\u5f15\u7528\u6237\u7a0b\u5e8f\u6267\u884c\u800c\u4ea7\u751f\u53d8\u52a8\u7684\u6807\u8bb0\u8bb0\u5f55\u3002 <\/span><\/li>\n<li><span style=\"color: #000000;\">\u7b5b\u9009\u56de\u6536\uff1a\u7b5b\u9009\u56de\u6536\u9636\u6bb5\u4f1a\u5bf9\u5404\u4e2a Region \u7684\u56de\u6536\u4ef7\u503c\u548c\u6210\u672c\u8fdb\u884c\u6392\u5e8f\uff0c\u6839\u636e\u7528\u6237\u6240\u671f\u671b\u7684 GC \u505c\u987f\u65f6\u95f4\u6765\u6307\u5b9a\u56de\u6536\u8ba1\u5212\uff08\u7528\u6700\u5c11\u7684\u65f6\u95f4\u6765\u56de\u6536\u5305\u542b\u5783\u573e\u6700\u591a\u7684\u533a\u57df.\u8fd9\u5c31\u662f Garbage First \u7684\u7531\u6765\u2014\u2014\u7b2c\u4e00\u65f6\u95f4\u6e05\u7406\u5783\u573e\u6700\u591a\u7684\u533a\u5757\uff09\uff0c\u8fd9\u91cc\u4e3a\u4e86\u63d0\u9ad8\u56de\u6536\u6548\u7387\uff0c\u5e76\u6ca1\u6709\u91c7\u7528\u548c\u7528\u6237\u7ebf\u7a0b\u5e76\u53d1\u6267\u884c\u7684\u65b9\u5f0f\uff0c\u800c\u662f\u505c\u987f\u7528\u6237\u7ebf\u7a0b\u3002<\/span><\/li>\n<\/ol>\n<blockquote>\n<div><span style=\"color: #000000;\">\u9002\u7528\u573a\u666f\uff1a\u8981\u6c42\u5c3d\u53ef\u80fd\u53ef\u63a7 GC \u505c\u987f\u65f6\u95f4\uff1b\u5185\u5b58\u5360\u7528\u8f83\u5927\u7684\u5e94\u7528\u3002<\/span><\/div>\n<\/blockquote>\n<h3 id=\"6.4.7%20%E6%9F%A5%E7%9C%8B%20JVM%20%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8%E8%AE%BE%E7%BD%AE%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8\"><span style=\"color: #000000;\"><strong>6.4.7 \u67e5\u770b JVM \u5783\u573e\u56de\u6536\u5668\u8bbe\u7f6e\u5783\u573e\u56de\u6536\u5668<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\"><strong>\u6253\u5370\u9ed8\u8ba4\u5783\u573e\u56de\u6536\u5668 <\/strong><\/span><\/p>\n<pre><code class=\"language-javascript\">-XX:+PrintCommandLineFlags -version<\/code><\/pre>\n<p><span style=\"color: #000000;\">JDK 8 \u9ed8\u8ba4\u7684\u5783\u573e\u56de\u6536\u5668<br \/>\n\u5e74\u8f7b\u4ee3\u4f7f\u7528 Parallel Scavenge GC<br \/>\n\u8001\u5e74\u4ee3\u4f7f\u7528 Parallel Old GC <\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u6253\u5370\u5783\u573e\u56de\u6536\u8be6\u7ec6\u4fe1\u606f<\/strong><\/span><\/p>\n<pre><code class=\"language-javascript\">-XX:+PrintGCDetails -version<\/code><\/pre>\n<p><span style=\"color: #000000;\"><strong>\u8bbe\u7f6e\u9ed8\u8ba4\u5783\u573e\u56de\u6536\u5668 <\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">Serial \u56de\u6536\u5668<\/span><\/p>\n<pre><code class=\"language-javascript\">-XX:+UseSerialGC \u5e74\u8f7b\u4ee3\u4f7f\u7528 Serial GC\uff0c \u8001\u5e74\u4ee3\u4f7f\u7528 Serial Old GC<\/code><\/pre>\n<p><span style=\"color: #000000;\">ParNew \u56de\u6536\u5668<\/span><\/p>\n<pre><code class=\"language-javascript\">-XX:+UseParNewGC \u5e74\u8f7b\u4ee3\u4f7f\u7528 ParNew GC,\u4e0d\u5f71\u54cd\u8001\u5e74\u4ee3\u3002<\/code><\/pre>\n<p><span style=\"color: #000000;\">CMS \u56de\u6536\u5668<\/span><\/p>\n<pre><code class=\"language-javascript\">-XX:+UseConcMarkSweepGC \u8001\u5e74\u4ee3\u4f7f\u7528 CMS GC\u3002<\/code><\/pre>\n<p><span style=\"color: #000000;\"># G1 \u56de\u6536\u5668 <\/span><\/p>\n<pre><code class=\"language-javascript\">-XX:+UseG1GC \u624b\u52a8\u6307\u5b9a\u4f7f\u7528 G1 \u6536\u96c6\u5668\u6267\u884c\u5185\u5b58\u56de\u6536\u4efb\u52a1\u3002\n-XX:G1HeapRegionSize \u8bbe\u7f6e\u6bcf\u4e2a Region \u7684\u5927\u5c0f\u3002<\/code><\/pre>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<p>\u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8eCSDN\uff1ahttps:\/\/blog.csdn.net\/weixin_56846554\/article\/details\/129802936<\/p>\n","raw":"","protected":false},"excerpt":{"rendered":"<p>\u76ee\u5f55 \u4e00\u3001JVM\u6982\u8ff0 1\u30011\u4e3a\u4ec0\u4e48\u8981\u5b66\u4e60JVM 1\u30012\u865a\u62df\u673a 1\u30013JVM\u4f5c\u7528 1\u30014JVM\u6574\u4f53\u7ec4\u6210\u90e8\u5206\u00a0 \u4e8c\u3001JVM\u7ed3\u6784&#8211;\u7c7b\u52a0 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