{"id":31252,"date":"2024-03-02T11:43:57","date_gmt":"2023-04-14T04:08:19","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8%e4%b8%ad%e6%96%87%e4%b8%ad%ef%bc%8cjava%e7%9a%84%e4%bb%a3%e8%a1%a8%e4%bb%80%e4%b9%88%ef%bc%9f\/"},"modified":"2025-08-12T23:04:28","modified_gmt":"2025-08-12T15:04:28","slug":"%e5%9c%a8%e4%b8%ad%e6%96%87%e4%b8%ad%ef%bc%8cjava%e7%9a%84%e4%bb%a3%e8%a1%a8%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8%e4%b8%ad%e6%96%87%e4%b8%ad%ef%bc%8cjava%e7%9a%84%e4%bb%a3%e8%a1%a8%e4%bb%80%e4%b9%88%ef%bc%9f\/","title":{"rendered":"\u5728\u4e2d\u6587\u4e2d\uff0cJava\u7684<>\u4ee3\u8868\u4ec0\u4e48\uff1f"},"content":{"rendered":"<h1>\u5f15\u5165<\/h1>\n<p>\u5927\u5bb6\u597d\uff0c\u6211\u662fKeChon\u3002<br \/>\n\u5927\u5bb6\u6709\u5728\u4f7f\u7528\u6cdb\u578b\u5417\uff1f<br \/>\n\u6211\u4eca\u5929\u7b2c\u4e00\u6b21\u5b66\u4e60\u5230\u4e86\u3002<br \/>\n\u5176\u5b9e\u4e4b\u524d\u4e00\u76f4\u88c5\u4f5c\u6ca1\u770b\u89c1\u8fc7\uff0c\u4f46\u7ec8\u4e8e\u9047\u5230\u4e86\u5b66\u4e60\u7684\u673a\u4f1a\u3002<\/p>\n<h2>\u5728\u4e0e\u6cdb\u578b\u76f8\u9047\u7684\u60c5\u5883\u4e2d<\/h2>\n<p>\u6211\u8ba4\u4e3a\u7b2c\u4e00\u6b21\u76f8\u9047\u4e00\u822c\u4f1a\u5728\u540d\u5355\u4e0a\u3002\u6211\u60f3\u4f60\u53ef\u80fd\u8bf4\u8fc7\u8fd9\u6837\u7684\u8bdd\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">list<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">ArrayList<\/span><span class=\"o\">&lt;&gt;();<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u53ea\u77e5\u9053\u8fd9\u662f\u4e00\u4e2a\u53ef\u53d8\u957f\u6570\u7ec4\u3002<br \/>\n\u4f7f\u7528<>\u7684\u7c7b\u88ab\u79f0\u4e3a\u6cdb\u578b\u7c7b\u3002<\/p>\n<h2>\u4f60\u5728\u8fd9\u4e2a\u5de5\u4f5c\u4e2d\u626e\u6f14\u4ec0\u4e48\u89d2\u8272\uff1f<\/h2>\n<pre class=\"post-pre\"><code><span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">list<\/span>\r\n<\/code><\/pre>\n<p>\u9996\u5148\u662f\u8fd9\u90e8\u5206\u3002<br \/>\nList\u672c\u8eab\u662f\u4e00\u4e2a\u7c7b\u4f3c\u6570\u7ec4\u7684\u63a5\u53e3\uff0c\u5b83\u53ef\u4ee5\u5b58\u50a8\u5e76\u5904\u7406\u591a\u4e2a\u5143\u7d20\u3002<br \/>\n\u5b83\u4e0d\u4ec5\u53ef\u4ee5\u5b58\u50a8String\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u8fd8\u53ef\u4ee5\u5b58\u50a8\u5404\u79cd\u7c7b\u578b\u7684\u5bf9\u8c61\uff08\u4ec5\u9650\u4e8e\u4e00\u79cd\u7c7b\u578b\uff09\u3002<br \/>\n\u800c\u4e0a\u9762\u7684\u58f0\u660e\u662f\u6307\u5b9a\u8981\u5b58\u50a8String\u7c7b\u578b\u7684\u5143\u7d20\u3002<\/p>\n<pre class=\"post-pre\"><code>\r\n<span class=\"k\">new<\/span> <span class=\"nc\">ArrayList<\/span><span class=\"o\">&lt;&gt;();<\/span>\r\n<\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\u662f\u8fd9\u90e8\u5206\u3002<>\u4e4b\u95f4\u662f\u7a7a\u7684\uff0c\u4f46\u8fd9\u53ea\u662f\u7701\u7565\u7684\uff08\u53ef\u4ee5\u901a\u8fc7\u5de6\u8fb9\u7684String\u6765\u63a8\u65ad\u51fa\u7c7b\u578b\uff09\u3002<\/p>\n<h1>\u4e00\u822c\u7684\u7684\u901a\u7528\u836f<\/h1>\n<p>\u5728\u4e0d\u4ec5\u9650\u4e8e\u5217\u8868\u7684\u66f4\u5e7f\u6cdb\u89c6\u89d2\u4e0b\uff0c\u8ba9\u6211\u4eec\u6765\u63a2\u8ba8\u4e00\u4e0b\u6cdb\u578b\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5b9a\u4e49\u3002<\/p>\n<pre class=\"post-pre\"><code>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Gene<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"no\">T<\/span> <span class=\"n\">t<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">setT<\/span><span class=\"o\">(<\/span><span class=\"no\">T<\/span> <span class=\"n\">t<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">t<\/span> <span class=\"o\">=<\/span> <span class=\"n\">t<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"no\">T<\/span> <span class=\"nf\">getT<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">t<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u4f7f\u7528\u65b9\u6cd5\u3002\n<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">Gene<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">g1<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Gene<\/span><span class=\"o\">&lt;&gt;();<\/span> <span class=\"c1\">\/\/ String\u578b\u3067\u56fa\u5b9a<\/span>\r\n<span class=\"nc\">Gene<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Integer<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">g2<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Gene<\/span><span class=\"o\">&lt;&gt;();<\/span> <span class=\"c1\">\/\/ Integer\u578b\u3067\u56fa\u5b9a<\/span>\r\n<span class=\"n\">g1<\/span><span class=\"o\">.<\/span><span class=\"na\">setT<\/span><span class=\"o\">(<\/span><span class=\"s\">\"test\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"n\">g1<\/span><span class=\"o\">.<\/span><span class=\"na\">getT<\/span><span class=\"o\">());<\/span> <span class=\"c1\">\/\/ test<\/span>\r\n<span class=\"n\">g2<\/span><span class=\"o\">.<\/span><span class=\"na\">setT<\/span><span class=\"o\">(<\/span><span class=\"mi\">24<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"n\">g2<\/span><span class=\"o\">.<\/span><span class=\"na\">getT<\/span><span class=\"o\">());<\/span> <span class=\"c1\">\/\/ 24<\/span>\r\n<\/code><\/pre>\n<h2>\u4e3a\u4ec0\u4e48\u611f\u5230\u9ad8\u5174\uff1f<\/h2>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5bf9\u4e8e\u540c\u4e00\u4e2a\u7c7b\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u4e2a\u4e0d\u540c\u7684\u7c7b\u3002<\/p>\n<h2>\u4e0d\uff0c\u4e0d\uff0c\u8fd9\u4e2a\u600e\u4e48\u6837\uff1f<\/h2>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">GeneObj<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nc\">Object<\/span> <span class=\"n\">t<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">setT<\/span><span class=\"o\">(<\/span><span class=\"nc\">Object<\/span> <span class=\"n\">t<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">t<\/span> <span class=\"o\">=<\/span> <span class=\"n\">t<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">Object<\/span> <span class=\"nf\">getT<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">t<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528 Object \u7c7b\u6765\u66ff\u4ee3\u4e4b\u524d\u9650\u5b9a\u4e8e T \u7c7b\u578b\u7684\u90e8\u5206\u3002\u90a3\u4e48\u5c31\u8ba9\u6211\u4eec\u5f00\u59cb\u4f7f\u7528\u5427\uff01<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">GeneObj<\/span> <span class=\"n\">g1<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">GeneObj<\/span><span class=\"o\">();<\/span> \r\n<span class=\"nc\">GeneObj<\/span> <span class=\"n\">g2<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">GeneObj<\/span><span class=\"o\">();<\/span> \r\n<span class=\"n\">g1<\/span><span class=\"o\">.<\/span><span class=\"na\">setT<\/span><span class=\"o\">(<\/span><span class=\"s\">\"test\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"n\">g1<\/span><span class=\"o\">.<\/span><span class=\"na\">getT<\/span><span class=\"o\">());<\/span> <span class=\"c1\">\/\/ test<\/span>\r\n<span class=\"n\">g2<\/span><span class=\"o\">.<\/span><span class=\"na\">setT<\/span><span class=\"o\">(<\/span><span class=\"mi\">24<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"n\">g2<\/span><span class=\"o\">.<\/span><span class=\"na\">getT<\/span><span class=\"o\">());<\/span> <span class=\"c1\">\/\/ 24<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u7528\u76f8\u540c\u7684\u4ee3\u7801\u7f16\u5199\u3002<\/p>\n<h1>\u603b\u7ed3<\/h1>\n<p>\u4e0d\u4f7f\u7528\u6cdb\u578b\u4e5f\u662f\u53ef\u4ee5\u7684\u5417\uff1f<\/p>\n<h1>\u4e0d\u4e0d\u4e0d<\/h1>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u4e24\u79cd\u65b9\u6cd5\u90fd\u53ef\u4ee5\u8fd0\u884c\uff0c\u4f46\u662f\u4f7f\u7528Object\u4f1a\u5b58\u5728\u95ee\u9898\u3002<br \/>\n\u7b80\u5355\u6765\u8bf4\uff0c\u8fd9\u4e2a\u7c7b\u5f88\u96be\u4f7f\u7528\u3002<\/p>\n<h2>\u4f7f\u7528\u8be5\u793a\u4f8b\u65f6\u4f1a\u5bfc\u81f4\u8fd0\u884c\u65f6\u9519\u8bef\u3002<\/h2>\n<pre class=\"post-pre\"><code>\r\n<span class=\"nc\">GeneObj<\/span> <span class=\"n\">g1<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">GeneObj<\/span><span class=\"o\">();<\/span> <span class=\"c1\">\/\/ String\u578b\u3067\u56fa\u5b9a<\/span>\r\n<span class=\"n\">g1<\/span><span class=\"o\">.<\/span><span class=\"na\">setT<\/span><span class=\"o\">(<\/span><span class=\"s\">\"1\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">Integer<\/span> <span class=\"n\">res<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"nc\">Integer<\/span><span class=\"o\">)<\/span> <span class=\"n\">g1<\/span><span class=\"o\">.<\/span><span class=\"na\">getT<\/span><span class=\"o\">()<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"o\">;<\/span> <span class=\"c1\">\/\/ClassCastException\u306e\u767a\u751f<\/span>\r\n<span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"n\">res<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u9519\u8bef\u5730\u5c06String\u653e\u5165\u4e86Integer\u7c7b\u578b\u7684\u53d8\u91cf\u4e2d\u3002<br \/>\n\u56e0\u6b64\uff0c\u5728\u5c06\u5176\u8f6c\u6362\u4e3aInteger\u7c7b\u65f6\u53d1\u751f\u4e86ClassCastException\u3002<br \/>\n\u5bf9\u4e8e\u4f7f\u7528\u8005\u6765\u8bf4\uff0c\u5fc5\u987b\u4e86\u89e3\u81ea\u5df1\u8bbe\u7f6e\u7684\u7c7b\u578b\uff0c\u5426\u5219\u4f1a\u6210\u4e3abug\u7684\u6e29\u5e8a\u3002<br \/>\n\u5982\u679c\u4f7f\u7528\u6cdb\u578b\uff0c\u5c31\u4e0d\u9700\u8981\u4f7f\u7528\u8f6c\u6362\u64cd\u4f5c\u4e86\uff0c\u800c\u4e14\u80fd\u591f\u5728\u7f16\u8bd1\u9519\u8bef\u4e2d\u53d1\u73b0\u95ee\u9898\u3002<\/p>\n<h1>\u603b\u7ed3<\/h1>\n<p>\u4e3a\u4e86\u5b9e\u73b0\u7c7b\u578b\u7684\u7075\u6d3b\u6027\u548c\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\uff0c\u6cdb\u578b\u662f\u5fc5\u9700\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f15\u5165 \u5927\u5bb6\u597d\uff0c\u6211\u662fKeChon\u3002 \u5927\u5bb6\u6709\u5728\u4f7f\u7528\u6cdb\u578b\u5417\uff1f \u6211\u4eca\u5929\u7b2c\u4e00\u6b21\u5b66\u4e60\u5230\u4e86\u3002 \u5176\u5b9e\u4e4b\u524d\u4e00\u76f4\u88c5\u4f5c\u6ca1\u770b\u89c1\u8fc7\uff0c\u4f46\u7ec8 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31252","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5728\u4e2d\u6587\u4e2d\uff0cJava\u7684\u4ee3\u8868\u4ec0\u4e48\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u5728\u4e2d\u6587\u4e2d\uff0cJava\u7684\u4ee3\u8868\u4ec0\u4e48\uff1f\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728\u4e2d\u6587\u4e2d\uff0cjava\u7684\u4ee3\u8868\u4ec0\u4e48\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5728\u4e2d\u6587\u4e2d\uff0cJava\u7684\u4ee3\u8868\u4ec0\u4e48\uff1f\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8e\u5728\u4e2d\u6587\u4e2d\uff0cJava\u7684\u4ee3\u8868\u4ec0\u4e48\uff1f\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728\u4e2d\u6587\u4e2d\uff0cjava\u7684\u4ee3\u8868\u4ec0\u4e48\uff1f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" 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