{"id":202713,"date":"2025-05-22T10:15:01","date_gmt":"2025-05-22T02:15:01","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202713\/"},"modified":"2025-05-22T10:15:01","modified_gmt":"2025-05-22T02:15:01","slug":"%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%9c%a8-java-%e4%b8%ad%e5%a6%82%e4%bd%95%e6%8f%90%e9%ab%98%e4%bb%a3%e7%a0%81%e8%b4%a8%e9%87%8f%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202713\/","title":{"rendered":"\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728 Java \u4e2d\u5982\u4f55\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\uff1f"},"content":{"rendered":"

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

\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728 Java \u4e2d\u5982\u4f55\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\uff1f<\/h1>\n

\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300a\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728 Java \u4e2d\u5982\u4f55\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~<\/p>\n

\u5728 Java \u4e2d\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u6765\u9632\u6b62\u6570\u636e\u7ade\u6001\u6761\u4ef6\u5e76\u7b80\u5316\u591a\u7ebf\u7a0b\u7f16\u7a0b\u3002\u4f7f\u7528\u7eaf\u51fd\u6570\u6765\u63d0\u9ad8\u53ef\u9884\u6d4b\u6027\uff0c\u7b80\u5316\u63a8\u7406\u5e76\u4fc3\u8fdb\u91cd\u7528\u3002\u5229\u7528 Java FP \u5e93\uff08\u5982 Stream API\uff09\u6765\u7b80\u5316\u96c6\u5408\u64cd\u4f5c\u3001\u63d0\u9ad8\u6027\u80fd\u5e76\u51cf\u5c11\u4ee3\u7801\u91cd\u590d\u3002<\/p>\n

<\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728 Java \u4e2d\u5982\u4f55\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \u662f\u57fa\u4e8e \u03bb \u6f14\u7b97\u7684\u4e00\u79cd\u7f16\u7a0b\u8303\u5f0f\uff0c\u5b83\u5f3a\u8c03\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u548c\u7eaf\u51fd\u6570\uff0c\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u9884\u6d4b\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u5728 Java \u4e2d\u8fd0\u7528 FP \u539f\u5219\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\u3002<\/p>\n

\u4e0d\u53ef\u53d8\u6570\u636e<\/strong><\/p>\n

FP \u5f3a\u8c03\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\uff0c\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u53d8\u91cf\u88ab\u521b\u5efa\uff0c\u5176\u503c\u5c31\u4e0d\u80fd\u88ab\u4fee\u6539\u3002\u8fd9\u6709\u52a9\u4e8e\u6d88\u9664\u6570\u636e\u7ade\u6001\u6761\u4ef6\uff0c\u5e76\u4f7f\u591a\u7ebf\u7a0b\u7f16\u7a0b\u66f4\u52a0\u5bb9\u6613\u3002\u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 final<\/code> \u5173\u952e\u5b57\u6765\u58f0\u660e\u4e0d\u53ef\u53d8\u53d8\u91cf\u548c\u5bf9\u8c61\u3002<\/p>\n

\u7eaf\u51fd\u6570<\/strong><\/p>\n

\u7eaf\u51fd\u6570\u662f\u53ea\u4f7f\u7528\u5176\u8f93\u5165\u5e76\u4e14\u4e0d\u4ea7\u751f\u526f\u4f5c\u7528\u7684\u51fd\u6570\u3002\u8fd9\u4f7f\u5f97\u5b83\u4eec\u6613\u4e8e\u7406\u89e3\u548c\u63a8\u7406\uff0c\u5e76\u4e14\u53ef\u4ee5\u8f7b\u677e\u91cd\u7528\u3002\u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 @FunctionalInterface<\/code> \u6ce8\u89e3\u6765\u6807\u8bb0\u7eaf\u51fd\u6570\u3002<\/p>\n

FP \u5e93<\/strong><\/p>\n

Java \u63d0\u4f9b\u4e86\u5f3a\u5927\u7684 FP \u5e93\uff0c\u4f8b\u5982 Java Stream API\uff0c\u5b83\u63d0\u4f9b\u4e86\u5404\u79cd\u7528\u4e8e\u5904\u7406\u96c6\u5408\u548c\u6d41\u7684\u64cd\u4f5c\u3002\u6d41\u662f\u60f0\u6027\u96c6\u5408\uff0c\u5ef6\u8fdf\u6267\u884c\u64cd\u4f5c\uff0c\u76f4\u5230\u7ed3\u679c\u88ab\u9700\u8981\u3002\u8fd9\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u5e76\u7b80\u5316\u4ee3\u7801\u3002<\/p>\n

\u5b9e\u6218\u6848\u4f8b\uff1a\u51cf\u5c11\u4ee3\u7801\u91cd\u590d<\/strong><\/p>\n

\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff0c\u5b83\u8ba1\u7b97\u5217\u8868\u4e2d\u6bcf\u4e2a\u5143\u7d20\u7684\u5e73\u65b9\uff1a<\/p>\n

import java.util.List;\n\npublic class SquareListWithoutFP {\n\n    public static void main(String[] args) {\n        List<Integer> numbers = List.of(1, 2, 3, 4, 5);\n\n        for (Integer number : numbers) {\n            System.out.println(number * number);\n        }\n    }\n}<\/pre>\n
\u4f7f\u7528 FP\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u6b64\u4ee3\u7801\u6982\u62ec\u4e3a\u4e00\u4e2a\u51fd\u6570\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
import java.util.List;\nimport java.util.stream.Stream;\n\npublic class SquareListWithFP {\n\n    public static void main(String[] args) {\n        List<Integer> numbers = List.of(1, 2, 3, 4, 5);\n\n        Stream<Integer> squaredNumbers = numbers.stream().map(x -> x * x);\n        squaredNumbers.forEach(System.out::println);\n    }\n}<\/pre>\n
\u901a\u8fc7\u4f7f\u7528\u6d41\u548c map()<\/code> \u64cd\u4f5c\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u60f0\u6027\u5217\u8868\uff0c\u5176\u4e2d\u6bcf\u4e2a\u5143\u7d20\u90fd\u5e73\u65b9\u4e86\u3002\u8fd9\u6d88\u9664\u4e86\u5faa\u73af\u548c\u91cd\u590d\u4ee3\u7801\u7684\u9700\u8981\u3002<\/p>\n
\u7ed3\u8bba<\/strong><\/p>\n
\u51fd\u6570\u5f0f\u7f16\u7a0b\u539f\u5219\u7684\u5e94\u7528\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8 Java \u4ee3\u7801\u8d28\u91cf\u3002\u901a\u8fc7\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u548c\u7eaf\u51fd\u6570\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u66f4\u53ef\u9884\u6d4b\u3001\u66f4\u6613\u4e8e\u7ef4\u62a4\u548c\u91cd\u7528\u7684\u4ee3\u7801\u3002\u6b64\u5916\uff0cJava FP \u5e93\u63d0\u4f9b\u4e86\u989d\u5916\u7684\u529f\u80fd\uff0c\u7b80\u5316\u4e86\u5e38\u89c1\u64cd\u4f5c\uff0c\u5e76\u63d0\u9ad8\u4e86\u6027\u80fd\u3002<\/p>\n
\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"
\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728 Java \u4e2d\u5982\u4f55\u63d0...<\/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-202713","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202713","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=202713"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202713\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202713"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202713"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202713"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}