{"id":202523,"date":"2025-05-22T09:07:20","date_gmt":"2025-05-22T01:07:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202523\/"},"modified":"2025-05-22T09:07:20","modified_gmt":"2025-05-22T01:07:20","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-java-%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e6%9d%a5%e8%a7%a3%e5%86%b3%e5%a4%8d%e6%9d%82%e9%97%ae%e9%a2%98%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202523\/","title":{"rendered":"\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u6765\u89e3\u51b3\u590d\u6742\u95ee\u9898\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u6765\u89e3\u51b3\u590d\u6742\u95ee\u9898\uff1f<\/h1>\n<p>\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300a\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u6765\u89e3\u51b3\u590d\u6742\u95ee\u9898\uff1f\u300b\uff0c\u4e3b\u8981\u5305\u62ec\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n<p>\u5728 Java \u4e2d\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u5177\u6709\u53ef\u8bfb\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u6269\u5c55\u6027\u7b49\u4f18\u52bf\u3002\u901a\u8fc7\u5b9e\u6218\u6f14\u793a\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 FP \u6765\u8fc7\u6ee4\u548c\u53d8\u6362\u96c6\u5408\uff0c\u4f8b\u5982\u8fc7\u6ee4\u6389\u957f\u5ea6\u5927\u4e8e 5 \u4e2a\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\u5e76\u5c06\u5176\u8f6c\u6362\u4e3a\u5927\u5199\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729913977671c64791c786.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u6765\u89e3\u51b3\u590d\u6742\u95ee\u9898<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u4f8b\uff0c\u5b83\u5f3a\u8c03\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u3001\u9ad8\u9636\u51fd\u6570\u548c lambda \u8868\u8fbe\u5f0f\u3002\u5b83\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e2e\u52a9\u89e3\u51b3\u590d\u6742\u7684\u95ee\u9898\u3002<\/p>\n<p><strong>Java \u4e2d\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b<\/strong><\/p>\n<p>Java 8 \u5f15\u5165\u4e86 lambda \u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u4f7f FP \u5728 Java \u4e2d\u53d8\u5f97\u66f4\u52a0\u5bb9\u6613\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528 Java \u4e2d\u7684\u8fd9\u4e9b\u529f\u80fd\u6765\u7f16\u5199\u51fd\u6570\u5f0f\u4ee3\u7801\uff1a<\/p>\n<ul>\n<li><strong>Lambda \u8868\u8fbe\u5f0f\uff1a<\/strong> \u7528\u4e8e\u533f\u540d\u521b\u5efa\u51fd\u6570\uff0c\u53ef\u4ee5\u4f5c\u4e3a\u51fd\u6570\u53c2\u6570\u4f20\u9012\u3002<\/li>\n<li><strong>\u51fd\u6570\u5f0f\u63a5\u53e3\uff1a<\/strong> \u53ea\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\uff0c\u53ef\u7528\u4e8e\u58f0\u660e\u63a5\u53d7 lambda \u8868\u8fbe\u5f0f\u53c2\u6570\u7684\u51fd\u6570\u3002<\/li>\n<\/ul>\n<p><strong>\u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u52bf<\/strong><\/p>\n<p>FP \u4e3a Java \u5e26\u6765\u4e86\u4ee5\u4e0b\u4f18\u52bf\uff1a<\/p>\n<ul>\n<li><strong>\u53ef\u8bfb\u6027\uff1a<\/strong> \u51fd\u6570\u5f0f\u4ee3\u7801\u901a\u5e38\u66f4\u7b80\u6d01\u3001\u6613\u4e8e\u7406\u89e3\u3002<\/li>\n<li><strong>\u53ef\u7ef4\u62a4\u6027\uff1a<\/strong> \u4e0d\u53ef\u53d8\u6570\u636e\u548c\u7eaf\u51fd\u6570\u6d88\u9664\u4e86\u526f\u4f5c\u7528\uff0c\u4ece\u800c\u4f7f\u4ee3\u7801\u66f4\u6613\u4e8e\u7ef4\u62a4\u3002<\/li>\n<li><strong>\u53ef\u6269\u5c55\u6027\uff1a<\/strong> \u51fd\u6570\u53ef\u4ee5\u7ec4\u5408\u8d77\u6765\u521b\u5efa\u65b0\u7684\u51fd\u6570\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u6269\u5c55\u6027\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a\u8fc7\u6ee4\u548c\u53d8\u6362\u96c6\u5408<\/strong><\/p>\n<p>\u8ba9\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u5b9e\u6218\u6848\u4f8b\u6765\u8bf4\u660e\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528 FP \u89e3\u51b3\u95ee\u9898\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5305\u542b\u5b57\u7b26\u4e32\u7684\u96c6\u5408\uff0c\u6211\u4eec\u9700\u8981\u8fc7\u6ee4\u6389\u957f\u5ea6\u5927\u4e8e 5 \u4e2a\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\uff0c\u5e76\u5c06\u5b83\u4eec\u8f6c\u6362\u4e3a\u5927\u5199\u3002<\/p>\n<p>\u4f7f\u7528 FP\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u7247\u6bb5\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff1a<\/p>\n<pre>List&lt;String&gt; strings = List.of(\"apple\", \"banana\", \"orange\", \"grape\", \"cherry\");\n\nList&lt;String&gt; filteredAndTransformed = strings\n    .stream()\n    .filter(s -&gt; s.length() &gt; 5)\n    .map(String::toUpperCase)\n    .toList();\n\nSystem.out.println(filteredAndTransformed);<\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u5b57\u7b26\u4e32\u96c6\u5408\u5e76\u5c06\u5176\u6d41\u5316\u4e3a\u6d41\u3002\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528 <code>filter<\/code> \u65b9\u6cd5\u8fc7\u6ee4\u6389\u957f\u5ea6\u5927\u4e8e 5 \u4e2a\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u4f7f\u7528 <code>map<\/code> \u65b9\u6cd5\u5c06\u6bcf\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u3002\u6700\u540e\uff0c\u6211\u4eec\u5c06\u7ed3\u679c\u6536\u96c6\u5230\u4e00\u4e2a\u65b0\u7684\u5217\u8868\u4e2d\u3002<\/p>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre>[APPLE, ORANGE, GRAPE]<\/pre>\n<p>\u4eca\u5929\u5173\u4e8e\u300a\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u6765\u89e3\u51b3\u590d\u6742\u95ee\u9898\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>\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16&#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-202523","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202523","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=202523"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202523\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202523"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202523"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}