{"id":202626,"date":"2025-05-22T08:40:33","date_gmt":"2025-05-22T00:40:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202626\/"},"modified":"2025-05-22T08:40:33","modified_gmt":"2025-05-22T00:40:33","slug":"%e4%bd%bf%e7%94%a8java%e5%87%bd%e6%95%b0%e7%9a%84%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202626\/","title":{"rendered":"\u4f7f\u7528Java\u51fd\u6570\u7684\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"

<\/b> <\/p>\n

\u4f7f\u7528Java\u51fd\u6570\u7684\u6700\u4f73\u5b9e\u8df5<\/h1>\n

\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u6253\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\u300a\u4f7f\u7528Java\u51fd\u6570\u7684\u6700\u4f73\u5b9e\u8df5\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\u5427\uff01\u6587\u4e2d\u5185\u5bb9\u5305\u542b<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9…\u5e0c\u671b\u4f60\u80fd\u5728\u9605\u8bfb\u672c\u6587\u540e\uff0c\u80fd\u771f\u771f\u5b9e\u5b9e\u5b66\u5230\u77e5\u8bc6\u6216\u8005\u5e2e\u4f60\u89e3\u51b3\u5fc3\u4e2d\u7684\u7591\u60d1\uff0c\u4e5f\u6b22\u8fce\u5927\u4f6c\u6216\u8005\u65b0\u4eba\u670b\u53cb\u4eec\u591a\u7559\u8a00\u8bc4\u8bba\uff0c\u591a\u7ed9\u5efa\u8bae\uff01\u8c22\u8c22\uff01<\/p>\n

Java \u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \u7684\u6700\u4f73\u5b9e\u8df5\u5305\u62ec\uff1a\u907f\u514d\u53ef\u53d8\u72b6\u6001\uff0c\u4f7f\u51fd\u6570\u4fdd\u6301\u7eaf\u51c0\u3002\u4f18\u5148\u4f7f\u7528\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff0c\u4ee5\u786e\u4fdd\u4e00\u81f4\u6027\u548c\u51cf\u5c11\u5e76\u53d1\u95ee\u9898\u3002\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u7b80\u5316\u4ee3\u7801\u5e76\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002\u6b63\u786e\u4f7f\u7528\u6d41\u5f0f\u5904\u7406\u8fdb\u884c\u6570\u636e\u8f6c\u6362\u3001\u7b5b\u9009\u548c\u805a\u5408\u3002\u4f7f\u7528\u51fd\u6570\u5f0f\u63a5\u53e3\u5efa\u6a21\u51fd\u6570\uff0c\u786e\u4fdd\u7c7b\u578b\u5b89\u5168\u6027\u548c\u4ee3\u7801\u677e\u8026\u5408\u3002<\/p>\n

<\/p>\n

\u4f7f\u7528 Java \u51fd\u6570\u7684\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n

\u5f15\u8a00<\/strong>
Java \u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u7b80\u5316\u4ee3\u7801\uff0c\u63d0\u9ad8\u6027\u80fd\u5e76\u63d0\u9ad8\u53ef\u7ef4\u62a4\u6027\u3002\u9075\u5faa\u6700\u4f73\u5b9e\u8df5\u5bf9\u4e8e\u5b9e\u73b0\u8fd9\u4e9b\u597d\u5904\u81f3\u5173\u91cd\u8981\u3002<\/p>\n

\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n

1. \u907f\u514d\u53ef\u53d8\u72b6\u6001<\/strong>
\u51fd\u6570\u5e94\u8be5\u7eaf\u51c0\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u4e0d\u4f1a\u6539\u53d8\u5176\u8f93\u5165\u6216\u5916\u90e8\u72b6\u6001\u3002\u907f\u514d\u4f7f\u7528\u53ef\u53d8\u6210\u5458\u53d8\u91cf\u6216\u5171\u4eab\u72b6\u6001\u3002<\/p>\n

2. \u4f18\u5148\u4f7f\u7528\u4e0d\u53ef\u53d8\u5bf9\u8c61<\/strong>
\u4e0d\u53ef\u53d8\u5bf9\u8c61\u5bf9\u4e8eFP\u81f3\u5173\u91cd\u8981\u3002\u5b83\u4eec\u786e\u4fdd\u4e00\u81f4\u6027\u548c\u51cf\u5c11\u5e76\u53d1\u95ee\u9898\u3002\u5c3d\u53ef\u80fd\u4f7f\u7528 String\u3001Integer \u548c List \u7b49\u4e0d\u53ef\u53d8\u7c7b\u578b\u3002<\/p>\n

3. \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f<\/strong>
lambda \u8868\u8fbe\u5f0f\u63d0\u4f9b\u4e86\u7b80\u6d01\u7684\u65b9\u6cd5\u6765\u5b9a\u4e49\u533f\u540d\u51fd\u6570\uff0c\u907f\u514d\u4e86\u521b\u5efa\u5927\u91cf\u5c0f\u63a5\u53e3\u7684\u9700\u8981\u3002\u4f7f\u7528 lambda \u6765\u7b80\u5316\u4ee3\u7801\u5e76\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002<\/p>\n

4. \u6b63\u786e\u4f7f\u7528\u6d41\u5f0f\u5904\u7406<\/strong>
\u6d41\u5f0f\u5904\u7406\u662f FP \u7684\u6838\u5fc3\u90e8\u5206\u3002\u4f7f\u7528\u6d41\u5f0f\u64cd\u4f5c\uff08\u4f8b\u5982 map()\u3001filter()\u3001reduce()\uff09\u6765\u5bf9\u6570\u636e\u8fdb\u884c\u8f6c\u6362\u3001\u7b5b\u9009\u548c\u805a\u5408\u3002<\/p>\n

5. \u51fd\u6570\u5f0f\u63a5\u53e3<\/strong>
\u51fd\u6570\u5f0f\u63a5\u53e3\u901a\u8fc7\u53ea\u5b9a\u4e49\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\uff0c\u5bf9\u51fd\u6570\u8fdb\u884c\u5efa\u6a21\u3002\u4f7f\u7528\u51fd\u6570\u5f0f\u63a5\u53e3\u6765\u786e\u4fdd\u7c7b\u578b\u5b89\u5168\u6027\u548c\u5b9e\u73b0\u677e\u8026\u5408\u4ee3\u7801\u3002<\/p>\n

\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n

\u4ee5\u4e0b\u4ee3\u7801\u6f14\u793a\u4e86\u6700\u4f73\u5b9e\u8df5\u7684\u5e94\u7528\uff1a<\/p>\n

interface MyFunction {\n    int apply(int x, int y);\n}\n\npublic class FunctionalBestPractices {\n\n    public static void main(String[] args) {\n        \/\/ \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u521b\u5efa\u51fd\u6570\u5f0f\u5bf9\u8c61\n        MyFunction add = (x, y) -> x + y;\n\n        \/\/ \u4f7f\u7528\u6d41\u5f0f\u5904\u7406\u8f6c\u6362\u548c\u805a\u5408\u6570\u636e\n        List<Integer> numbers = List.of(1, 2, 3, 4, 5);\n        int sum = numbers.stream()\n                .map(x -> x * 2) \/\/ \u8f6c\u6362\uff1a\u5c06\u6bcf\u4e2a\u5143\u7d20\u4e58\u4ee5 2\n                .filter(x -> x % 2 == 0) \/\/ \u7b5b\u9009\uff1a\u8fc7\u6ee4\u6389\u5947\u6570\n                .reduce(0, Integer::sum); \/\/ \u805a\u5408\uff1a\u6c42\u548c\n\n        System.out.println(sum); \/\/ \u6253\u5370\u7ed3\u679c\uff1a20\n    }\n}<\/pre>\n
\u7ed3\u8bba<\/strong>
\u901a\u8fc7\u9075\u5faa\u8fd9\u4e9b\u6700\u4f73\u5b9e\u8df5\uff0c\u60a8\u53ef\u4ee5\u5728 Java \u4ee3\u7801\u4e2d\u6709\u6548\u5730\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u3002\u8fd9\u5c06\u4e3a\u60a8\u5e26\u6765\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\u3001\u6027\u80fd\u548c\u7ef4\u62a4\u6027\u7684\u597d\u5904\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300a\u4f7f\u7528Java\u51fd\u6570\u7684\u6700\u4f73\u5b9e\u8df5\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8ejava,\u7f16\u7a0b\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4f7f\u7528Java\u51fd\u6570\u7684\u6700\u4f73\u5b9e\u8df5 \u4e00\u5206...<\/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-202626","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202626","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=202626"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202626\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202626"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202626"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202626"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}