{"id":300557,"date":"2024-05-20T17:46:01","date_gmt":"2024-05-20T09:46:01","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/300557.html"},"modified":"2024-05-20T17:46:09","modified_gmt":"2024-05-20T09:46:09","slug":"java%e4%b8%ad%e5%a6%82%e4%bd%95%e7%bb%99%e8%87%aa%e5%ae%9a%e4%b9%89%e7%b1%bb%e6%95%b0%e7%bb%84%e6%b7%bb%e5%8a%a0%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/300557.html","title":{"rendered":"java\u4e2d\u5982\u4f55\u7ed9\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u6dfb\u52a0\u6570\u636e"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26212823\/0fe2b6a1-9cdb-4006-a013-287fec9eae51.webp\" alt=\"java\u4e2d\u5982\u4f55\u7ed9\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u6dfb\u52a0\u6570\u636e\" \/><\/p>\n<p><p>Java\u4e2d\u7ed9\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u6dfb\u52a0\u6570\u636e\u901a\u5e38\u6d89\u53ca\u5230\u6570\u7ec4\u7684\u521d\u59cb\u5316\u3001\u521b\u5efa\u5bf9\u8c61\u4ee5\u53ca\u5c06\u5bf9\u8c61\u5b58\u50a8\u5230\u6570\u7ec4\u4e2d\u7684\u64cd\u4f5c\u3002\u901a\u8fc7\u58f0\u660e\u6570\u7ec4\u3001\u521d\u59cb\u5316\u6570\u7ec4\u3001\u521b\u5efa\u5bf9\u8c61\u5b9e\u4f8b\u3001\u5c06\u5bf9\u8c61\u5b9e\u4f8b\u8d4b\u503c\u5230\u6570\u7ec4\u4e2d\u7684\u5177\u4f53\u7d22\u5f15\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u5b8c\u6210\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u7684\u6570\u636e\u6dfb\u52a0\u5de5\u4f5c\u3002\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u6570\u7ec4\u7684\u5904\u7406\u4e00\u822c\u9075\u5faa\u4ee5\u4e0b\u6b65\u9aa4\uff1a\u5148\u5b9a\u4e49\u6570\u7ec4\u7c7b\u578b\u3001\u518d\u521b\u5efa\u6570\u7ec4\u5b9e\u4f8b\u3001\u7136\u540e\u521b\u5efa\u6bcf\u4e00\u4e2a\u81ea\u5b9a\u4e49\u5bf9\u8c61\u3001\u6700\u540e\u5c06\u5bf9\u8c61\u8d4b\u503c\u7ed9\u6570\u7ec4\u7684\u6bcf\u4e2a\u4f4d\u7f6e\u3002\u63a5\u4e0b\u6765\uff0c\u8be6\u7ec6\u5c55\u5f00\u5bf9\u6570\u7ec4\u521d\u59cb\u5316\u548c\u5bf9\u8c61\u5b9e\u4f8b\u5316\u7684\u63cf\u8ff0\u3002<\/p>\n<\/p>\n<p><h2>\u4e00\u3001\u5b9a\u4e49\u6570\u7ec4\u7c7b\u578b<\/h2>\n<\/p>\n<p><p>\u5728\u5f00\u59cb\u7ed9\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u6dfb\u52a0\u6570\u636e\u4e4b\u524d\uff0c\u9700\u8981\u5b9a\u4e49\u6570\u7ec4\u7684\u7c7b\u578b\u3002\u5728Java\u4e2d\uff0c\u6570\u7ec4\u662f\u4e00\u79cd\u5f15\u7528\u6570\u636e\u7c7b\u578b\uff0c\u5176\u58f0\u660e\u65b9\u5f0f\u4e0e\u57fa\u672c\u6570\u636e\u7c7b\u578b\u6570\u7ec4\u76f8\u4f3c\uff0c\u4f46\u5143\u7d20\u7c7b\u578b\u4e3a\u81ea\u5b9a\u4e49\u7c7b\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6709\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7c7b<code>Person<\/code>\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">public class Person {<\/p>\n<p>    String name;<\/p>\n<p>    int age;<\/p>\n<p>    public Person(String name, int age) {<\/p>\n<p>        this.name = name;<\/p>\n<p>        this.age = age;<\/p>\n<p>    }<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5b9a\u4e49\u4e00\u4e2a<code>Person<\/code>\u7c7b\u578b\u7684\u6570\u7ec4\u53ef\u4ee5\u7528\u4ee5\u4e0b\u58f0\u660e\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">Person[] personArray;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u6b65\u9aa4\u4e2d\uff0c\u5e76\u6ca1\u6709\u5b9e\u9645\u521b\u5efa\u6570\u7ec4\u5bf9\u8c61\uff0c\u53ea\u662f\u58f0\u660e\u4e86\u6570\u7ec4\u7684\u7c7b\u578b\u3002<\/p>\n<\/p>\n<p><h2>\u4e8c\u3001\u521d\u59cb\u5316\u6570\u7ec4\u5b9e\u4f8b<\/h2>\n<\/p>\n<p><p>\u58f0\u660e\u6570\u7ec4\u53d8\u91cf\u4e4b\u540e\uff0c\u9700\u8981\u521d\u59cb\u5316\u6570\u7ec4\u5b9e\u4f8b\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">personArray = new Person[10]; \/\/ \u6570\u7ec4\u7684\u957f\u5ea6\u4e3a10<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8be5\u8bed\u53e5\u5b9e\u9645\u4e0a\u521b\u5efa\u4e86\u4e00\u4e2a\u53ef\u4ee5\u5bb9\u7eb310\u4e2a<code>Person<\/code>\u7c7b\u578b\u5bf9\u8c61\u7684\u6570\u7ec4\u3002\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u88ab\u9ed8\u8ba4\u521d\u59cb\u5316\u4e3a<code>null<\/code>\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u8fd8\u672a\u6307\u5411\u4efb\u4f55<code>Person<\/code>\u5bf9\u8c61\u3002<\/p>\n<\/p>\n<p><h2>\u4e09\u3001\u521b\u5efa\u5bf9\u8c61\u5b9e\u4f8b<\/h2>\n<\/p>\n<p><p>\u6709\u4e86\u6570\u7ec4\u4e4b\u540e\uff0c\u63a5\u4e0b\u6765\u9700\u8981\u521b\u5efa\u81ea\u5b9a\u4e49\u7c7b\u7684\u5bf9\u8c61\u5b9e\u4f8b\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">Person person1 = new Person(&quot;Alice&quot;, 25);<\/p>\n<p>Person person2 = new Person(&quot;Bob&quot;, 30);<\/p>\n<p>\/\/ ... \u53ef\u4ee5\u521b\u5efa\u66f4\u591a\u7684Person\u5bf9\u8c61<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u4e9b\u5bf9\u8c61\u53ef\u4ee5\u88ab\u7528\u6765\u586b\u5145\u6570\u7ec4\u3002<\/p>\n<\/p>\n<p><h2>\u56db\u3001\u7ed9\u6570\u7ec4\u8d4b\u503c<\/h2>\n<\/p>\n<p><p>\u6700\u540e\uff0c\u6211\u4eec\u628a\u521b\u5efa\u7684\u5bf9\u8c61\u5b9e\u4f8b\u8d4b\u503c\u7ed9\u6570\u7ec4\u7684\u5bf9\u5e94\u7d22\u5f15\u4f4d\u7f6e\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">personArray[0] = person1;<\/p>\n<p>personArray[1] = person2;<\/p>\n<p>\/\/ \u7ee7\u7eed\u4e3a\u5176\u4ed6\u7d22\u5f15\u8d4b\u503c<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u901a\u8fc7\u4e0a\u9762\u7684\u6b65\u9aa4\uff0c\u6211\u4eec\u5c31\u6210\u529f\u5730\u7ed9\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4<code>personArray<\/code>\u6dfb\u52a0\u4e86\u6570\u636e\u3002<\/p>\n<\/p>\n<p><p><strong>\u5b8c\u6210\u5bf9\u6570\u7ec4\u7684\u8d4b\u503c\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u8fdb\u884c\u6570\u7ec4\u7684\u904d\u5386\u3001\u67e5\u8be2\u3001\u4fee\u6539\u7b49\u64cd\u4f5c<\/strong>\u3002\u904d\u5386\u6570\u7ec4\u53ef\u4ee5\u4f7f\u7528for\u5faa\u73af\u6216\u8005foreach\u5faa\u73af\uff1b\u67e5\u8be2\u548c\u4fee\u6539\u53ea\u9700\u901a\u8fc7\u6570\u7ec4\u7d22\u5f15\u5373\u53ef\u3002\u786e\u4fdd\u6570\u7ec4\u64cd\u4f5c\u4e0d\u4f1a\u8d8a\u754c\uff0c\u5e76\u4e14\u5bf9\u4e8e\u6bcf\u4e2a\u53ef\u80fd\u4e3a<code>null<\/code>\u7684\u6570\u7ec4\u5143\u7d20\uff0c\u5728\u8fdb\u884c\u64cd\u4f5c\u4e4b\u524d\u5e94\u8be5\u68c0\u67e5\u5176\u662f\u5426\u4e3a<code>null<\/code>\u4ee5\u907f\u514d<code>NullPointerException<\/code>\u3002<\/p>\n<\/p>\n<p><p>\u5728\u5904\u7406\u548c\u6dfb\u52a0\u6570\u636e\u5230\u81ea\u5b9a\u4e49\u5bf9\u8c61\u6570\u7ec4\u7684\u8fc7\u7a0b\u4e2d\uff0c\u8fd8\u5e94\u8003\u8651\u64cd\u4f5c\u7684\u5f02\u5e38\u5b89\u5168\u6027\u53ca\u6548\u7387\u95ee\u9898\uff0c\u6bd4\u5982\u53ef\u4ee5\u901a\u8fc7\u6269\u5bb9\u3001\u590d\u5236\u6570\u7ec4\u7b49\u65b9\u5f0f\u6765\u5904\u7406\u6570\u7ec4\u6ee1\u5458\u7684\u60c5\u51b5\u3002\u5728\u7a0b\u5e8f\u8bbe\u8ba1\u4e2d\uff0c\u901a\u5e38\u4e5f\u53ef\u4ee5\u4f7f\u7528<code>ArrayList<\/code>\u7b49\u96c6\u5408\u6765\u4ee3\u66ff\u6570\u7ec4\u64cd\u4f5c\uff0c\u56e0\u4e3a\u96c6\u5408\u63d0\u4f9b\u4e86\u66f4\u591a\u7075\u6d3b\u6027\u548c\u529f\u80fd\u3002\u4f46\u662f\u5728\u9762\u4e34\u660e\u786e\u4e14\u56fa\u5b9a\u5927\u5c0f\u7684\u6570\u636e\u7ed3\u6784\u9700\u6c42\u65f6\uff0c\u4f7f\u7528\u6570\u7ec4\u4ecd\u7136\u662f\u4e00\u4e2a\u9ad8\u6548\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. \u5982\u4f55\u7ed9\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u6dfb\u52a0\u6570\u636e\uff1f<\/strong><br \/>\n\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9aa4\u7ed9\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u6dfb\u52a0\u6570\u636e\uff1a<\/p>\n<ul>\n<li>\u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7c7b\u7684\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u4ee3\u8868\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u3002<\/li>\n<li>\u7136\u540e\uff0c\u4f7f\u7528\u6570\u7ec4\u7d22\u5f15\u6765\u8bbf\u95ee\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u7684\u7279\u5b9a\u4f4d\u7f6e\u3002<\/li>\n<li>\u63a5\u4e0b\u6765\uff0c\u4f7f\u7528\u5bf9\u8c61\u7684\u6784\u9020\u5668\u6216setter\u65b9\u6cd5\uff0c\u521d\u59cb\u5316\u6216\u4fee\u6539\u81ea\u5b9a\u4e49\u7c7b\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/li>\n<li>\u6700\u540e\uff0c\u5c06\u66f4\u65b0\u540e\u7684\u81ea\u5b9a\u4e49\u7c7b\u5bf9\u8c61\u8d4b\u503c\u7ed9\u6570\u7ec4\u7684\u6307\u5b9a\u4f4d\u7f6e\uff0c\u4ee5\u6dfb\u52a0\u6570\u636e\u5230\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u4e2d\u3002<\/li>\n<\/ul>\n<p><strong>2. \u5728Java\u4e2d\uff0c\u5982\u4f55\u5411\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u6dfb\u52a0\u65b0\u7684\u6570\u636e\u9879\uff1f<\/strong><br \/>\n\u8981\u5411\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u4e2d\u6dfb\u52a0\u65b0\u7684\u6570\u636e\u9879\uff0c\u4f60\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9aa4\u8fdb\u884c\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li>\u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a\u4e0e\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u76f8\u540c\u7c7b\u578b\u7684\u65b0\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u4ee3\u8868\u8981\u6dfb\u52a0\u7684\u6570\u636e\u9879\u3002<\/li>\n<li>\u7136\u540e\uff0c\u901a\u8fc7\u8bbe\u7f6e\u65b0\u5bf9\u8c61\u7684\u5c5e\u6027\u503c\u6765\u521d\u59cb\u5316\u6570\u636e\u9879\u3002<\/li>\n<li>\u63a5\u4e0b\u6765\uff0c\u5c06\u65b0\u5bf9\u8c61\u8d4b\u503c\u7ed9\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u7684\u4e0b\u4e00\u4e2a\u53ef\u7528\u7d22\u5f15\u4f4d\u7f6e\uff0c\u4ee5\u6dfb\u52a0\u65b0\u7684\u6570\u636e\u9879\u3002<\/li>\n<li>\u6700\u540e\uff0c\u66f4\u65b0\u6570\u7ec4\u7684\u8ba1\u6570\u5668\u53d8\u91cf\uff0c\u4f7f\u5176\u52a01\uff0c\u4ee5\u4fbf\u8ffd\u8e2a\u81ea\u5b9a\u4e49\u7c7b\u6570\u7ec4\u4e2d\u7684\u6709\u6548\u6570\u636e\u9879\u6570\u91cf\u3002<\/li>\n<\/ul>\n<p><strong>3. 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