{"id":202741,"date":"2025-05-22T10:54:34","date_gmt":"2025-05-22T02:54:34","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202741\/"},"modified":"2025-05-22T10:54:34","modified_gmt":"2025-05-22T02:54:34","slug":"%e5%9c%a8-java-%e4%b8%ad%e5%a6%82%e4%bd%95%e5%ba%94%e7%94%a8%e5%87%bd%e6%95%b0%e5%bc%8f%e7%ae%a1%e9%81%93%e6%a8%a1%e5%bc%8f%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202741\/","title":{"rendered":"\u5728 Java \u4e2d\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7ba1\u9053\u6a21\u5f0f\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u5728 Java \u4e2d\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7ba1\u9053\u6a21\u5f0f\uff1f<\/h1>\n<p>\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5728 Java \u4e2d\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7ba1\u9053\u6a21\u5f0f\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n<p>\u5728 Java \u4e2d\uff0c\u51fd\u6570\u5f0f\u7ba1\u9053\u6a21\u5f0f\u5141\u8bb8\u5c06\u6570\u636e\u6d41\u901a\u8fc7\u4e00\u7cfb\u5217\u51fd\u6570\u8fdb\u884c\u8f6c\u6362\u3001\u5904\u7406\u548c\u805a\u5408\u3002\u4f7f\u7528 Java Stream API\uff0c\u53ef\u4ee5\u901a\u8fc7 map()\u3001filter() \u548c reduce() \u51fd\u6570\u5b9e\u73b0\u6b64\u6a21\u5f0f\uff0c\u4f8b\u5982\u5c06 List \u4e2d\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u3001\u8fc7\u6ee4\u957f\u5ea6\u5c0f\u4e8e 5 \u7684\u5b57\u7b26\u4e32\uff0c\u5e76\u5c06\u5176\u8fde\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002\u8be5\u6a21\u5f0f\u7684\u597d\u5904\u5305\u62ec\u53ef\u8bfb\u6027\u3001\u6027\u80fd\u548c\u53ef\u6269\u5c55\u6027\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729938215671cc32731760.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5728 Java \u4e2d\u5e94\u7528\u51fd\u6570\u5f0f\u7ba1\u9053\u6a21\u5f0f<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u7ba1\u9053\u6a21\u5f0f\u662f\u4e00\u79cd\u8f6f\u4ef6\u8bbe\u8ba1\u6a21\u5f0f\uff0c\u5141\u8bb8\u5c06\u4e00\u7ec4\u6570\u636e\u901a\u8fc7\u4e00\u7cfb\u5217\u51fd\u6570\u8fdb\u884c\u8f6c\u6362\u3001\u5904\u7406\u548c\u805a\u5408\u3002\u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 Stream API \u8f7b\u677e\u5b9e\u73b0\u7ba1\u9053\u6a21\u5f0f\u3002<\/p>\n<p><strong>Stream API<\/strong><\/p>\n<p>Stream API \u63d0\u4f9b\u4e86\u4e00\u7ec4\u7528\u4e8e\u64cd\u4f5c\u6570\u636e\u6d41\u7684\u51fd\u6570\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>map()<\/code>: \u5c06\u6d41\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u6620\u5c04\u5230\u65b0\u503c\u3002<\/li>\n<li><code>filter()<\/code>: \u6839\u636e\u6761\u4ef6\u8fc7\u6ee4\u6d41\u4e2d\u7684\u5143\u7d20\u3002<\/li>\n<li><code>reduce()<\/code>: \u5c06\u6d41\u4e2d\u7684\u5143\u7d20\u805a\u5408\u4e3a\u5355\u4e2a\u503c\u3002<\/li>\n<\/ul>\n<p><strong>\u7ba1\u9053\u6a21\u5f0f\u6848\u4f8b<\/strong><\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a List&lt;String&gt;\uff0c\u6211\u4eec\u60f3\u8981\u5c06\u6bcf\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\uff0c\u7136\u540e\u8fc7\u6ee4\u6389\u957f\u5ea6\u5c0f\u4e8e 5 \u7684\u5b57\u7b26\u4e32\uff0c\u6700\u540e\u5c06\u5b83\u4eec\u8fde\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n<p><strong>\u4ee3\u7801\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>import java.util.Arrays;\nimport java.util.List;\nimport java.util.stream.Collectors;\n\npublic class Main {\n    public static void main(String[] args) {\n        \/\/ \u8f93\u5165\u6570\u636e\n        List&lt;String&gt; strings = Arrays.asList(\"Apple\", \"Banana\", \"Cat\", \"Dog\", \"Elephant\");\n\n        \/\/ \u5e94\u7528\u51fd\u6570\u5f0f\u7ba1\u9053\n        String result = strings.stream()\n                \/\/ \u8f6c\u6362\n                .map(String::toUpperCase)\n                \/\/ \u8fc7\u6ee4\n                .filter(s -&gt; s.length() &gt;= 5)\n                \/\/ \u805a\u5408\n                .collect(Collectors.joining(\", \"));\n\n        \/\/ \u8f93\u51fa\u7ed3\u679c\n        System.out.println(result);\n    }\n}<\/pre>\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n<pre>APPLE, BANANA, ELEPHANT<\/pre>\n<p><strong>\u4f18\u70b9<\/strong><\/p>\n<p>\u4f7f\u7528\u51fd\u6570\u5f0f\u7ba1\u9053\u6a21\u5f0f\u5177\u6709\u4ee5\u4e0b\u4f18\u70b9\uff1a<\/p>\n<ul>\n<li>\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff1a\u7ba1\u9053\u5c06\u4ee3\u7801\u7ec4\u7ec7\u6210\u4e00\u4e2a\u6613\u4e8e\u9075\u5faa\u7684\u5355\u884c\u3002<\/li>\n<li>\u6027\u80fd\uff1aStream API \u5229\u7528\u5e76\u884c\u6027\u6765\u63d0\u9ad8\u5904\u7406\u5927\u6570\u636e\u96c6\u7684\u6548\u7387\u3002<\/li>\n<li>\u53ef\u6269\u5c55\u6027\uff1a\u53ef\u4ee5\u8f7b\u677e\u5730\u5c06\u65b0\u51fd\u6570\u6dfb\u52a0\u5230\u7ba1\u9053\u4ee5\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u5904\u7406\u3002<\/li>\n<\/ul>\n<p>\u4eca\u5929\u5173\u4e8e\u300a\u5728 Java \u4e2d\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7ba1\u9053\u6a21\u5f0f\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Java \u4e2d\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7ba1&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202741","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202741","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202741"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202741\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202741"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202741"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202741"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}