{"id":298,"date":"2019-12-31T23:59:03","date_gmt":"2019-12-31T15:59:03","guid":{"rendered":"https:\/\/wadeaech.xyz\/?p=298"},"modified":"2026-03-22T09:58:52","modified_gmt":"2026-03-22T01:58:52","slug":"%e6%b3%9b%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/wadeaech.xyz\/?p=298","title":{"rendered":"\u6cdb\u578b"},"content":{"rendered":"<h1><span class=\"ez-toc-section\" id=\"%E6%B3%9B%E5%9E%8B\"><\/span>\u6cdb\u578b<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>\u6cdb\u578b\u4e5f\u53eb\u53c2\u6570\u5316\u7c7b\u578b \u6cdb\u6307\u67d0\u4e00\u7c7b\u578b\uff0c\u5c31\u662f\u628a\u201c\u7c7b\u578b\u201d\u5f53\u4f5c\u53c2\u6570\u4f20\u7ed9\u7c7b\u3001\u63a5\u53e3\u6216\u65b9\u6cd5\uff0c\u662f\u4e00\u79cd\u7f16\u8bd1\u671f\u7684\u7c7b\u578b\u68c0\u67e5\u5de5\u5177\uff08\u8ba9\u7f16\u8bd1\u5668\u5e2e\u4f60\u5728\u7f16\u8bd1\u671f\u505a\u7c7b\u578b==\u7ea6\u675f==\uff0c\u963b\u6b62\u4e0d\u7b26\u5408\u8981\u6c42\u7684\u7c7b\u88ab\u4f20\u5165\uff09\uff0c\u51cf\u5c11\u5f3a\u8f6c\u548c\u8fd0\u884c\u65f6 ClassCastException\u3002<\/p>\n<ul>\n<li>\u5feb\u901f\u793a\u4f8b<\/li>\n<\/ul>\n<pre><code class=\"language-Java\">List list = new ArrayList();\nlist.add(&quot;hello&quot;);\nInteger x = (Integer) list.get(0); \/\/ \u8fd0\u884c\u65f6\u70b8\uff1aClassCastException\n\nList&lt;String&gt; list = new ArrayList&lt;&gt;();\nlist.add(&quot;hello&quot;);\nInteger x = list.get(0); \/\/ \u7f16\u8bd1\u671f\u76f4\u63a5\u62a5\u9519\uff0c\u63d0\u793a\u4f60\u5e94\u8be5\u4fee\u6539\u4ee3\u7801\n<\/code><\/pre>\n<h1><span class=\"ez-toc-section\" id=\"%E6%B3%9B%E5%9E%8B%E7%B1%BB\"><\/span>\u6cdb\u578b\u7c7b<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<ol>\n<li>\u793a\u4f8b<\/li>\n<\/ol>\n<pre><code class=\"language-Java\">class Box&lt;T&gt; {\n    private T value;  \/\/ \u5c5e\u6027value\u7684\u7c7b\u578b\u4e3aT\n\n    public void set(T v) {  \/\/ \u53c2\u6570v\u7684\u7c7b\u578b\u662fT\n        value = v;\n    }\n\n    public T get() { \/\/ \u65b9\u6cd5get\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u662fT\n        return value;\n    }\n}\n\nBox&lt;Integer&gt; b = new Box&lt;&gt;();  \/\/\u521b\u5efa\u5bf9\u8c61\u7684\u65f6\u5019\u81ea\u5b9a\u4e49T\u7684\u7c7b\u578b\u4e3aInteger\nb.set(123);\n<\/code><\/pre>\n<ol start=\"2\">\n<li>==\u6cdb\u578b\u7684\u58f0\u660e==<br \/>\n<code>class Box&lt;T, E&gt; <\/code>  \u53ef\u4ee5\u6307\u5b9a\u591a\u4e2a\u7c7b\u578b\u3002<br \/>\n\u5e38\u7528\u5b57\u6bcd E K T V\uff0c\u610f\u4e3a Element Type Key Value\u3002<br \/>\nT, E \u53ea\u80fd\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u4e0d\u80fd\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b\u3002<br \/>\n\u6307\u5b9a\u5177\u4f53\u7c7b\u578b\u540e\u53ef\u4ee5\u4f20\u5165\u8be5\u7c7b\u578b\u6216\u5176\u5b50\u7c7b\u578b\u3002<br \/>\n\u9759\u6001\u65b9\u6cd5\u548c\u9759\u6001\u5c5e\u6027\u4e2d\u4e0d\u80fd\u4f7f\u7528\u7c7b\u7684\u6cdb\u578b\uff0c\u56e0\u4e3a\u9759\u6001\u662f\u548c\u7c7b\u76f8\u5173\u7684\uff0c\u5728\u7c7b\u52a0\u8f7d\u7684\u65f6\u5019\u5bf9\u8c61\u8fd8\u6ca1\u6709\u521b\u5efa \u6cdb\u578b\u4e0d\u77e5\u9053\u662f\u4ec0\u4e48\u7c7b\u578b\u3002<br \/>\n\u4f7f\u7528\u6cdb\u578b\u7684\u6570\u7ec4\u4e0d\u53ef\u4ee5\u521d\u59cb\u5316\uff0c\u56e0\u4e3a\u6570\u7ec4\u7684\u521d\u59cb\u5316\u9700\u8981\u6307\u5b9a\u957f\u5ea6\uff0c\u4f46\u4f60\u4f7f\u7528\u7684\u662f\u6cdb\u578b \u7f16\u8bd1\u5668\u5e76\u4e0d\u77e5\u9053\u6cdb\u578bT\u7684\u5177\u4f53\u7c7b\u578b \u53ea\u77e5\u9053\u5b83\u662fT\u7c7b\u3002<\/li>\n<li>\u6cdb\u578b\u7c7b\u7684\u5199\u6cd5<\/li>\n<\/ol>\n<pre><code class=\"language-Java\">Box&lt;String&gt; stringBox = new Box&lt;String&gt;()\uff08\u8001\u5199\u6cd5\uff09\n\nBox&lt;String&gt; stringBox = new Box&lt;&gt;()\uff08\u65b0\u5199\u6cd5\uff0c\u63a8\u8350\uff09\n\nBox stringBox = new Box()\uff08\u5982\u679c\u4ec0\u4e48\u90fd\u4e0d\u5199\uff0c\u7b49\u4ef7\u4e8eObject\u6cdb\u578b\uff09\nBox&lt;Object&gt; stringBox = new Box&lt;&gt;()\n<\/code><\/pre>\n<p>\u8fd9\u4e24\u79cd\u5199\u6cd5\u5728\u529f\u80fd\u548c\u8fd0\u884c\u6548\u679c\u4e0a\u6ca1\u6709\u4efb\u4f55\u533a\u522b\uff0c\u5b8c\u5168\u662f\u4e00\u56de\u4e8b\uff0c\u552f\u4e00\u7684\u533a\u522b\u5728\u4e8eJava \u7248\u672c\u7684\u5386\u53f2\u6f14\u8fdb\u548c\u4ee3\u7801\u7684\u7b80\u6d01\u7a0b\u5ea6<\/p>\n<h1><span class=\"ez-toc-section\" id=\"%E6%B3%9B%E5%9E%8B%E6%8E%A5%E5%8F%A3\"><\/span>\u6cdb\u578b\u63a5\u53e3<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<pre><code class=\"language-Java\">interface Repository&lt;T&gt; {\n    T findById(long id);\n}\n<\/code><\/pre>\n<p>\u6cdb\u578b\u63a5\u53e3\u7684\u5177\u4f53\u7c7b\u578b\u5728 \u5176\u5b83\u63a5\u53e3\u7ee7\u627f\u63a5\u53e3  \u7c7b\u5b9e\u73b0\u63a5\u53e3 \u7684\u65f6\u5019\u786e\u5b9a\u3002<br \/>\n\u58f0\u660e\u63a5\u53e3\u65f6\uff1aT \u53ea\u662f\u5360\u4f4d\uff0c\u6ca1\u5b9a\u3002<br \/>\n\u67d0\u4e2a\u5b50\u63a5\u53e3\u5199\u4e86 extends Repository&lt;\\User&gt;\uff1a\u5728\u8fd9\u91cc\u5b9a\u4e3a User\u3002<br \/>\n\u67d0\u4e2a\u5b9e\u73b0\u7c7b\u5199\u4e86 implements Repository&lt;\\User&gt;\uff1a\u5728\u8fd9\u91cc\u5b9a\u4e3a User\u3002<br \/>\n\u5982\u679c\u7ee7\u627f\/\u5b9e\u73b0\u65f6\u4ecd\u7136\u5199 T\uff1a\u90a3\u5c31\u662f\u201c\u7ee7\u7eed\u5f80\u4e0b\u4f20\u201d\uff0c\u76f4\u5230\u67d0\u4e00\u5c42\u7528\u5177\u4f53\u7c7b\u578b\u66ff\u6362\u5b83\u3002<\/p>\n<h1><span class=\"ez-toc-section\" id=\"%E6%B3%9B%E5%9E%8B%E6%96%B9%E6%B3%95\"><\/span>\u6cdb\u578b\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<pre><code class=\"language-Java\">\u57fa\u672c\u8bed\u6cd5\uff1a\n\u4fee\u9970\u7b26 &lt;T, R\u2026&gt; \u8fd4\u56de\u7c7b\u578b \u65b9\u6cd5\u540d(\u53c2\u6570\u5217\u8868){\n}\npublic static &lt;T&gt; T first(List&lt;T&gt; list) {\n    return list.get(0);\n}\n\/\/ \u8fa8\u8ba4\u6280\u5de7\uff1a\u65b9\u6cd5\u8fd4\u56de\u503c\u524d\u9762\u7684 &lt;T&gt; \u662f\u201c\u58f0\u660e\u7c7b\u578b\u53c2\u6570\u201d\uff0cT\u662f\u53d8\u91cf\u540d\u3002\n<\/code><\/pre>\n<ul>\n<li>\u6cdb\u578b\u65b9\u6cd5 \u548c \u6cdb\u578b\u7c7b\u91cc\u9762\u7684\u65b9\u6cd5<br \/>\n\u8fd9\u662f\u4e24\u79cd\u4e0d\u540c\u7684\u4e1c\u897f\uff0c\u540e\u8005\u53ea\u662f\u4f7f\u7528\u4e86\u7c7b\u7684\u7c7b\u578b\u53c2\u6570\uff0c\u524d\u8005\u662f\u81ea\u5df1\u58f0\u660e\u7684\u7c7b\u578b\u53c2\u6570\u3002\u540c\u540d\u65f6\u9075\u5faa\u6cdb\u578b\u65b9\u6cd5\u91cc\u7684\u5b9a\u4e49\u3002<br \/>\n(A) \u975e\u6cdb\u578b\u7c7b\u91cc\u7684\u6cdb\u578b\u65b9\u6cd5<\/li>\n<\/ul>\n<pre><code class=\"language-Java\">class Utils {\n    public static &lt;T&gt; T first(List&lt;T&gt; list) {\n        return list.get(0);\n    }\n}\n<\/code><\/pre>\n<p>(B) \u6cdb\u578b\u7c7b\u91cc\u4e5f\u53ef\u4ee5\u518d\u5199\u6cdb\u578b\u65b9\u6cd5\uff08\u5b83\u6709\u81ea\u5df1\u7684\u7c7b\u578b\u53c2\u6570\uff09<\/p>\n<pre><code class=\"language-Java\">class Car&lt;T&gt; {\n    private T value;\n\n    public &lt;U, R&gt; U convert(T f) { \/\/ U\u548cR \u662f\u65b9\u6cd5\u81ea\u5df1\u7684\n        \n    }\n}\n\/\/\u8fd9\u91cc T\u6765\u81ea\u7c7b Box&lt;T&gt; U\u548cR\u6765\u81eaconvert\u65b9\u6cd5\n<\/code><\/pre>\n<h1><span class=\"ez-toc-section\" id=\"%E9%80%9A%E9%85%8D%E7%AC%A6\"><\/span>\u901a\u914d\u7b26<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>Java \u6cdb\u578b\u91cc\u7684\u901a\u914d\u7b26 ?\u8868\u793a\u201c\u67d0\u4e2a\u6211\u73b0\u5728\u4e0d\u60f3\/\u4e0d\u80fd\u5199\u6b7b\u7684\u7c7b\u578b\u201d\u3002\u5b83\u5e38\u7528\u4e8e\u65b9\u6cd5\u53c2\u6570\uff0c\u7528\u6765\u8868\u8fbe\u201c\u6211\u80fd\u63a5\u53d7\u4e00\u7c7b\u6cdb\u578b\u7c7b\u578b\u201d\uff0c\u89e3\u51b3\u6cdb\u578b\u201c\u4e0d\u53d8\u6027\u201d\u5e26\u6765\u7684\u4e0d\u65b9\u4fbf\u3002<br \/>\n\u65e0\u754c\u901a\u914d\u7b26&lt;?&gt;\uff0c\u652f\u6301\u4efb\u610f\u7c7b\u578b\u7684\u6cdb\u578b<br \/>\n\u4e0a\u754c\u901a\u914d\u7b26&lt;? extends A&gt;\uff0c\u652f\u6301A\u7c7b\u53caA\u7c7b\u7684\u5b50\u7c7b\uff0c\u89c4\u5b9a\u4e86\u6cdb\u578b\u7684\u4e0a\u9650<br \/>\n\u4e0a\u754c\u901a\u914d\u7b26&lt;? super A&gt;\uff0c\u652f\u6301A\u7c7b\u53caA\u7c7b\u7684\u7236\u7c7b\uff0c\u89c4\u5b9a\u4e86\u6cdb\u578b\u7684\u4e0b\u9650<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/wadeaech.xyz\/?p=298\/#%E6%B3%9B%E5%9E%8B\" >\u6cdb\u578b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/wadeaech.xyz\/?p=298\/#%E6%B3%9B%E5%9E%8B%E7%B1%BB\" >\u6cdb\u578b\u7c7b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/wadeaech.xyz\/?p=298\/#%E6%B3%9B%E5%9E%8B%E6%8E%A5%E5%8F%A3\" >\u6cdb\u578b\u63a5\u53e3<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/wadeaech.xyz\/?p=298\/#%E6%B3%9B%E5%9E%8B%E6%96%B9%E6%B3%95\" >\u6cdb\u578b\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/wadeaech.xyz\/?p=298\/#%E9%80%9A%E9%85%8D%E7%AC%A6\" >\u901a\u914d\u7b26<\/a><\/li><\/ul><\/nav><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u6cdb\u578b \u6cdb\u578b\u4e5f\u53eb\u53c2\u6570\u5316\u7c7b\u578b \u6cdb\u6307\u67d0\u4e00\u7c7b\u578b\uff0c\u5c31\u662f\u628a\u201c\u7c7b\u578b\u201d\u5f53\u4f5c\u53c2\u6570\u4f20\u7ed9\u7c7b\u3001\u63a5\u53e3\u6216\u65b9\u6cd5\uff0c\u662f\u4e00\u79cd\u7f16\u8bd1\u671f\u7684\u7c7b\u578b\u68c0\u67e5\u5de5\u5177\uff08<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"https:\/\/wadeaech.xyz\/?p=298\" class=\"link-btn theme-btn\"><span>Read More <\/span> <i class=\"fa fa-caret-right\"><\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-298","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u6cdb\u578b - WadeAech<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/wadeaech.xyz\/?p=298\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u6cdb\u578b - WadeAech\" \/>\n<meta property=\"og:description\" content=\"\u6cdb\u578b \u6cdb\u578b\u4e5f\u53eb\u53c2\u6570\u5316\u7c7b\u578b \u6cdb\u6307\u67d0\u4e00\u7c7b\u578b\uff0c\u5c31\u662f\u628a\u201c\u7c7b\u578b\u201d\u5f53\u4f5c\u53c2\u6570\u4f20\u7ed9\u7c7b\u3001\u63a5\u53e3\u6216\u65b9\u6cd5\uff0c\u662f\u4e00\u79cd\u7f16\u8bd1\u671f\u7684\u7c7b\u578b\u68c0\u67e5\u5de5\u5177\uff08    Read More\" \/>\n<meta property=\"og:url\" content=\"https:\/\/wadeaech.xyz\/?p=298\" \/>\n<meta property=\"og:site_name\" content=\"WadeAech\" \/>\n<meta property=\"article:published_time\" content=\"2019-12-31T15:59:03+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-22T01:58:52+00:00\" \/>\n<meta name=\"author\" content=\"wade\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"wade\" \/>\n\t<meta name=\"twitter:label2\" 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