{"id":3999,"date":"2024-05-11T08:15:29","date_gmt":"2024-05-11T00:15:29","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/index.php\/%e9%9d%a2%e8%af%95\/%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9ajava-%e4%b8%ad%e7%9a%84%e6%b3%9b%e5%9e%8b%e6%98%af%e5%a6%82%e4%bd%95%e5%b7%a5%e4%bd%9c%e7%9a%84%ef%bc%9f%e7%b1%bb%e5%9e%8b%e6%93%a6%e9%99%a4%ef%bc%88type-erasure\/"},"modified":"2024-05-24T15:04:05","modified_gmt":"2024-05-24T07:04:05","slug":"%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9ajava-%e4%b8%ad%e7%9a%84%e6%b3%9b%e5%9e%8b%e6%98%af%e5%a6%82%e4%bd%95%e5%b7%a5%e4%bd%9c%e7%9a%84%ef%bc%9f%e7%b1%bb%e5%9e%8b%e6%93%a6%e9%99%a4%ef%bc%88type-erasure","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/%e9%9d%a2%e8%af%95\/%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9ajava-%e4%b8%ad%e7%9a%84%e6%b3%9b%e5%9e%8b%e6%98%af%e5%a6%82%e4%bd%95%e5%b7%a5%e4%bd%9c%e7%9a%84%ef%bc%9f%e7%b1%bb%e5%9e%8b%e6%93%a6%e9%99%a4%ef%bc%88type-erasure\/","title":{"rendered":"\u9762\u8bd5\u5b98\uff1aJava \u4e2d\u7684\u6cdb\u578b\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f\u7c7b\u578b\u64e6\u9664\uff08Type Erasure\uff09\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<div class=\"wxsyncmain\">\n<p data-v-md-line=\"1\"><span style=\"letter-spacing: normal; font-size: 16px;\">Java \u4e2d\u7684\u6cdb\u578b\u5141\u8bb8\u5728\u7c7b\u3001\u63a5\u53e3\u548c\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u7c7b\u578b\u53c2\u6570\uff08Type Parameters\uff09\uff0c\u4ece\u800c\u63d0\u4f9b\u7f16\u8bd1\u65f6\u7c7b\u578b\u5b89\u5168\u548c\u51cf\u5c11\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u7684\u9700\u8981\u3002<\/span><\/p>\n<h3 style=\"margin-top: 24px; margin-bottom: 24px;\" data-v-md-heading=\"\u6cdb\u578b\u662f\u5982\u4f55\u5de5\u4f5c\u7684\" data-v-md-line=\"3\"><strong><span style=\"font-size: 20px;\">\u6cdb\u578b\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/span><\/strong><\/h3>\n<section style=\"margin-bottom: 16px;\"><span style=\"font-size: 16px; letter-spacing: normal;\">\u5f53\u4f60\u5b9a\u4e49\u4e00\u4e2a\u6cdb\u578b\u7c7b\u6216\u65b9\u6cd5\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2a\u6216\u591a\u4e2a\u7c7b\u578b\u53c2\u6570\u4ee3\u66ff\u5177\u4f53\u7684\u7c7b\u578b\u3002\u4f8b\u5982\uff1a<\/span><\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<pre class=\"code-snippet__js\" data-lang=\"cpp\"><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__keyword\">public<\/span> <span class=\"code-snippet__class\"><span class=\"code-snippet__keyword\">class<\/span> <span class=\"code-snippet__title\">Box<\/span>&lt;T&gt; {<\/span><\/span><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__keyword\">private<\/span> T t; <span class=\"code-snippet__comment\">\/\/ T stands for \"Type\"<\/span><\/span><\/code><code><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__function\"><span class=\"code-snippet__keyword\">public<\/span> <span class=\"code-snippet__keyword\">void<\/span> <span class=\"code-snippet__title\">set<\/span><span class=\"code-snippet__params\">(T t)<\/span> <\/span>{ <span class=\"code-snippet__keyword\">this<\/span>.t = t; }<\/span><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__function\"><span class=\"code-snippet__keyword\">public<\/span> T <span class=\"code-snippet__title\">get<\/span><span class=\"code-snippet__params\">()<\/span> <\/span>{ <span class=\"code-snippet__keyword\">return<\/span> t; }<\/span><\/code><code><span class=\"code-snippet_outer\">}<\/span><\/code><code><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__keyword\">public<\/span> &lt;U&gt; <span class=\"code-snippet__function\"><span class=\"code-snippet__keyword\">void<\/span> <span class=\"code-snippet__title\">inspect<\/span><span class=\"code-snippet__params\">(U u)<\/span><\/span>{<\/span><\/code><code><span class=\"code-snippet_outer\">System.out.println(<span class=\"code-snippet__string\">\"U:\"<\/span>+u.getClass().getName());<\/span><\/code><code><span class=\"code-snippet_outer\">}<\/span><\/code><\/pre>\n<\/section>\n<p data-v-md-line=\"20\"><span style=\"font-size: 16px; letter-spacing: normal;\">\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cBox \u7c7b\u4f7f\u7528\u4e86\u4e00\u4e2a\u7c7b\u578b\u53c2\u6570 T\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u53ef\u4ee5\u7528\u6765\u5b58\u50a8\u4efb\u4f55\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u5e76\u4e14\u4f7f\u7528\u8be5\u5bf9\u8c61\u65f6\u4e0d\u9700\u8981\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u3002<\/span><\/p>\n<p data-v-md-line=\"22\"><span style=\"font-size: 16px; letter-spacing: normal;\">\u6cdb\u578b\u7684\u5de5\u4f5c\u539f\u7406\u662f\uff0c\u5728<strong>\u7f16\u8bd1\u65f6\u671f<\/strong>\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff0c\u786e\u4fdd\u4ee3\u7801\u4e2d\u4f7f\u7528\u7684\u7c7b\u578b\u662f\u6b63\u786e\u7684\u3002\u7136\u540e\uff0c\u5728<strong>\u8fd0\u884c\u65f6\u671f<\/strong>\uff0c\u6cdb\u578b\u4fe1\u606f\u4f1a\u88ab\u64e6\u9664\uff0c\u8fd9\u5c31\u5f15\u5165\u4e86\u7c7b\u578b\u64e6\u9664\u7684\u6982\u5ff5\u3002<\/span><\/p>\n<h3 style=\"margin-top: 24px; margin-bottom: 24px;\" data-v-md-heading=\"\u7c7b\u578b\u64e6\u9664-type-erasure\" data-v-md-line=\"24\"><strong><span style=\"font-size: 20px;\">\u7c7b\u578b\u64e6\u9664\uff08Type Erasure\uff09<\/span><\/strong><\/h3>\n<p data-v-md-line=\"26\"><span style=\"font-size: 16px; letter-spacing: normal;\">\u7c7b\u578b\u64e6\u9664\u662f Java \u6cdb\u578b\u7684\u4e00\u4e2a\u7279\u70b9\uff0c\u6307\u7684\u662f\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u6cdb\u578b\u4ee3\u7801\u65f6\u4f1a\u5c06\u6240\u6709\u7684\u7c7b\u578b\u53c2\u6570\u66ff\u6362\u4e3a\u5b83\u4eec\u7684\u9650\u5b9a\u7c7b\u578b\uff08bounded type\uff09\uff0c\u82e5\u672a\u6307\u5b9a\u9650\u5b9a\u7c7b\u578b\u5219\u4f7f\u7528 <strong>Object<\/strong>\uff0c\u7136\u540e\u5728\u76f8\u5173\u5730\u65b9\u63d2\u5165\u7c7b\u578b\u8f6c\u6362\u4ee5\u4fdd\u6301\u7c7b\u578b\u5b89\u5168\u3002\u8fd9\u4f7f\u5f97\u6cdb\u5316\u7684\u7c7b\u578b\u80fd\u591f\u4e0e Java \u65e9\u671f\u7248\u672c\u7684\u4ee3\u7801\u517c\u5bb9\u3002<\/span><\/p>\n<p data-v-md-line=\"28\"><span style=\"font-size: 16px; letter-spacing: normal;\">\u4f8b\u5982\uff0c\u4ee5\u4e0b\u6cdb\u578b Box \u7c7b:<\/span><\/p>\n<section class=\"code-snippet__fix code-snippet__js\">\n<pre class=\"code-snippet__js\" data-lang=\"cpp\"><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__keyword\">public<\/span> <span class=\"code-snippet__class\"><span class=\"code-snippet__keyword\">class<\/span> <span class=\"code-snippet__title\">Box<\/span>&lt;T&gt; {<\/span><\/span><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__keyword\">private<\/span> T t;<\/span><\/code><code><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__function\"><span class=\"code-snippet__keyword\">public<\/span> <span class=\"code-snippet__keyword\">void<\/span> <span class=\"code-snippet__title\">set<\/span><span class=\"code-snippet__params\">(T t)<\/span> <\/span>{ <span class=\"code-snippet__keyword\">this<\/span>.t = t; }<\/span><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__function\"><span class=\"code-snippet__keyword\">public<\/span> T <span class=\"code-snippet__title\">get<\/span><span class=\"code-snippet__params\">()<\/span> <\/span>{ <span class=\"code-snippet__keyword\">return<\/span> t; }<\/span><\/code><code><span class=\"code-snippet_outer\">}<\/span><\/code><\/pre>\n<\/section>\n<p><span style=\"letter-spacing: normal; font-size: 16px;\">\u5728\u7f16\u8bd1\u4e4b\u540e\u4f1a\u53d8\u6210\uff1a<\/span><\/p>\n<section class=\"code-snippet__fix code-snippet__js\">\n<pre class=\"code-snippet__js\" data-lang=\"typescript\"><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__keyword\">public<\/span> <span class=\"code-snippet__keyword\">class<\/span> Box {<\/span><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__keyword\">private<\/span> <span class=\"code-snippet__built_in\">Object<\/span> t;<\/span><\/code><code><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__keyword\">public<\/span> <span class=\"code-snippet__built_in\">void<\/span> <span class=\"code-snippet__keyword\">set<\/span>(<span class=\"code-snippet__built_in\">Object<\/span> t) { <span class=\"code-snippet__keyword\">this<\/span>.t = t; }<\/span><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__keyword\">public<\/span> <span class=\"code-snippet__built_in\">Object<\/span> <span class=\"code-snippet__keyword\">get<\/span>() { <span class=\"code-snippet__keyword\">return<\/span> t; }<\/span><\/code><code><span class=\"code-snippet_outer\">}<\/span><\/code><\/pre>\n<\/section>\n<p data-v-md-line=\"50\"><span style=\"letter-spacing: normal; font-size: 16px;\">\u8fd9\u79cd\u65b9\u5f0f\u610f\u5473\u7740\u8fd0\u884c\u65f6\u7c7b\u578b\u4fe1\u606f\u5173\u4e8e\u6cdb\u578b\u53c2\u6570\u662f\u4e0d\u5b58\u5728\u7684\uff08\u79f0\u4e3a\u7c7b\u578b\u64e6\u9664\uff09\u3002\u56e0\u6b64\uff0c\u5728\u8fd0\u884c\u65f6\u65e0\u6cd5\u5f97\u77e5\u4e00\u4e2a\u96c6\u5408\u7684\u5143\u7d20\u7c7b\u578b\u662f\u4ec0\u4e48\u3002<\/span><\/p>\n<h3 style=\"margin-top: 24px; margin-bottom: 24px;\" data-v-md-heading=\"\u4f8b\u5b50\" data-v-md-line=\"52\"><strong><span style=\"font-size: 20px;\">\u4e3e\u4e2a\u6817\u5b50<img decoding=\"async\" class=\"rich_pages wxw-img lazyload\" style=\"display: inline-block; width: 20px; vertical-align: middle; background-size: cover; height: auto !important;\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524144407192.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" data-ratio=\"1\" data-w=\"128\" \/><noscript><img decoding=\"async\" class=\"rich_pages wxw-img\" style=\"display: inline-block; width: 20px; vertical-align: middle; background-size: cover; height: auto !important;\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524144407192.png\" data-ratio=\"1\" data-w=\"128\" \/><\/noscript><\/span><\/strong><\/h3>\n<p data-v-md-line=\"54\"><span style=\"letter-spacing: normal; font-size: 16px;\">\u5047\u8bbe\u6211\u4eec\u6709\u4ee5\u4e0b\u7684\u6cdb\u578b\u63a5\u53e3\u548c\u7c7b\uff1a<\/span><\/p>\n<section class=\"code-snippet__fix code-snippet__js\">\n<pre class=\"code-snippet__js\" data-lang=\"java\"><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__class\"><span class=\"code-snippet__keyword\">interface<\/span> <span class=\"code-snippet__title\">List<\/span>&lt;<span class=\"code-snippet__title\">E<\/span>&gt; <\/span>{<\/span><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__function\"><span class=\"code-snippet__keyword\">void<\/span> <span class=\"code-snippet__title\">add<\/span><span class=\"code-snippet__params\">(E e)<\/span><\/span>;<\/span><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__function\">Iterator&lt;E&gt; <span class=\"code-snippet__title\">iterator<\/span><span class=\"code-snippet__params\">()<\/span><\/span>;<\/span><\/code><code><span class=\"code-snippet_outer\">}<\/span><\/code><code><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__class\"><span class=\"code-snippet__keyword\">class<\/span> <span class=\"code-snippet__title\">StringList<\/span> <span class=\"code-snippet__keyword\">implements<\/span> <span class=\"code-snippet__title\">List<\/span>&lt;<span class=\"code-snippet__title\">String<\/span>&gt; <\/span>{<\/span><\/code><code><span class=\"code-snippet_outer\">    <span class=\"code-snippet__comment\">\/\/ \u5b9e\u73b0\u63a5\u53e3\u7684\u65b9\u6cd5<\/span><\/span><\/code><code><span class=\"code-snippet_outer\">}<\/span><\/code><\/pre>\n<\/section>\n<section style=\"margin-bottom: 16px;\"><span style=\"letter-spacing: normal; font-size: 16px;\">\u5728\u8fd0\u884c\u65f6\uff0cStringList \u7684\u5b9e\u4f8b\u53ea\u77e5\u9053\u5b83\u5b9e\u73b0\u4e86\u4e00\u4e2a\u5904\u7406 Object \u7c7b\u578b\u7684 List \u63a5\u53e3\uff0c\u5bf9 String 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get()\u65b9\u6cd5\u7684\u8c03\u7528\u8005\u5c06\u4f1a\u5f97\u5230\u4e00\u4e2a\u7f16\u8bd1\u5668\u63d2\u5165\u7684\u5bf9\u8fd4\u56de\u503c\u7684\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u3002\u8fd9\u6837\u5373\u4f7f\u7c7b\u578b\u4fe1\u606f\u5df2\u7ecf\u88ab\u64e6\u9664\uff0c\u4ee3\u7801\u5728\u8fd0\u884c\u65f6\u4e5f\u80fd\u6b63\u5e38\u5de5\u4f5c\uff0c\u800c\u4e14\u4e0d\u4f1a\u51fa\u73b0\u7c7b\u578b\u9519\u8bef\u3002<\/span><\/p>\n<p style=\"display: none;\">\n<blockquote><p>\u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8e\u5fae\u4fe1\u516c\u4f17\u53f7: \u4e92\u8054\u7f51\u9762\u8bd5\u5c0f\u5e2e\u624b<\/p><\/blockquote>\n<\/div>\n","raw":"","protected":false},"excerpt":{"rendered":"<p>Java \u4e2d\u7684\u6cdb\u578b\u5141\u8bb8\u5728\u7c7b\u3001\u63a5\u53e3\u548c\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u7c7b\u578b\u53c2\u6570\uff08Type Parameters\uff09\uff0c\u4ece\u800c\u63d0\u4f9b\u7f16\u8bd1\u65f6\u7c7b\u578b\u5b89\u5168\u548c\u51cf\u5c11\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u7684 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