{"id":202944,"date":"2025-05-22T09:40:17","date_gmt":"2025-05-22T01:40:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202944\/"},"modified":"2025-05-22T09:40:17","modified_gmt":"2025-05-22T01:40:17","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e6%8e%a5%e5%8f%a3%e5%9c%a8%e4%bb%a3%e7%a0%81%e7%ae%80%e6%b4%81%e5%92%8c%e5%a4%8d%e7%94%a8%e6%80%a7%e6%96%b9%e9%9d%a2%e7%9a%84%e4%bc%98%e5%8a%bf%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202944\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u63a5\u53e3\u5728\u4ee3\u7801\u7b80\u6d01\u548c\u590d\u7528\u6027\u65b9\u9762\u7684\u4f18\u52bf\uff1f"},"content":{"rendered":"

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

Java\u51fd\u6570\u5f0f\u63a5\u53e3\u5728\u4ee3\u7801\u7b80\u6d01\u548c\u590d\u7528\u6027\u65b9\u9762\u7684\u4f18\u52bf\uff1f<\/h1>\n

\u4f60\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u5417\uff1f\u672c\u6587\u300aJava\u51fd\u6570\u5f0f\u63a5\u53e3\u5728\u4ee3\u7801\u7b80\u6d01\u548c\u590d\u7528\u6027\u65b9\u9762\u7684\u4f18\u52bf\uff1f\u300b<\/span>\uff0c\u4e3b\u8981\u4ecb\u7ecd\u7684\u5185\u5bb9\u5c31\u6d89\u53ca\u5230<\/span>\uff0c\u5982\u679c\u4f60\u60f3\u63d0\u5347\u81ea\u5df1\u7684\u5f00\u53d1\u80fd\u529b\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5927\u5bb6\u8981\u77e5\u9053\u7f16\u7a0b\u7406\u8bba\u57fa\u7840\u548c\u5b9e\u6218\u64cd\u4f5c\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u54e6\uff01<\/p>\n

\u51fd\u6570\u5f0f\u63a5\u53e3\u7684\u4f18\u52bf\u5728\u4e8e\uff1a\u7b80\u6d01\u6027\uff1a\u901a\u8fc7 lambda \u8868\u8fbe\u5f0f\u6216\u65b9\u6cd5\u5f15\u7528\u5b9a\u4e49\u884c\u4e3a\uff0c\u6d88\u9664\u4e86\u663e\u5f0f\u6307\u5b9a\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u590d\u6742\u6027\u3002\u590d\u7528\u6027\uff1a\u5c06\u884c\u4e3a\u89e3\u8026\u5230\u5355\u72ec\u7684\u6a21\u5757\u6216\u7c7b\u4e2d\uff0c\u5141\u8bb8\u5728\u4e0d\u540c\u4e0a\u4e0b\u6587\u4e2d\u91cd\u7528\u884c\u4e3a\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5f0f\u63a5\u53e3\u7684\u7b80\u6d01\u6027\u548c\u590d\u7528\u6027\u4f18\u52bf<\/h2>\n

\u7b80\u4ecb<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u63a5\u53e3\u5728 Java \u4e2d\u626e\u6f14\u7740\u81f3\u5173\u91cd\u8981\u7684\u89d2\u8272\uff0c\u5b83\u4eec\u5141\u8bb8\u5c06\u884c\u4e3a\u4f5c\u4e3a\u5bf9\u8c61\u4f20\u9012\uff0c\u4ece\u800c\u7b80\u5316\u4ee3\u7801\u5e76\u63d0\u9ad8\u53ef\u91cd\u7528\u6027\u3002<\/p>\n

\u7b80\u6d01\u6027<\/strong><\/p>\n

\u4f20\u7edf\u7684 Java \u65b9\u6cd5\u9700\u8981\u663e\u5f0f\u6307\u5b9a\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7c7b\u578b\uff0c\u8fd9\u4f1a\u4f7f\u4ee3\u7801\u81c3\u80bf\u548c\u4e0d\u5fc5\u8981\u5730\u590d\u6742\u3002\u51fd\u6570\u5f0f\u63a5\u53e3\u901a\u8fc7\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u6216\u65b9\u6cd5\u5f15\u7528\u6765\u5b9a\u4e49\u884c\u4e3a\uff0c\u4ece\u800c\u6d88\u9664\u4e86\u8fd9\u79cd\u590d\u6742\u6027\u3002<\/p>\n

\u4f8b\u5982\uff1a<\/p>\n

\/\/ \u4f20\u7edf\u65b9\u6cd5\npublic int add(int a, int b) {\n    return a + b;\n}\n\n\/\/ \u51fd\u6570\u5f0f\u63a5\u53e3\n@FunctionalInterface\npublic interface Adder {\n    int add(int a, int b);\n}\n\n\/\/ \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\nAdder adder = (a, b) -> a + b;<\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u51fd\u6570\u5f0f\u63a5\u53e3 Adder<\/code> \u7b80\u5316\u4e86\u5c06\u52a0\u6cd5\u64cd\u4f5c\u4f20\u9012\u7ed9\u5176\u4ed6\u65b9\u6cd5\u6216\u5b58\u50a8\u5728\u6570\u636e\u7ed3\u6784\u4e2d\u7684\u8fc7\u7a0b\u3002<\/p>\n
\u590d\u7528\u6027<\/strong><\/p>\n
\u51fd\u6570\u5f0f\u63a5\u53e3\u5141\u8bb8\u5c06\u884c\u4e3a\u89e3\u8026\u5230\u5355\u72ec\u7684\u6a21\u5757\u6216\u7c7b\u4e2d\uff0c\u8fd9\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u91cd\u7528\u6027\u3002\u53ef\u4ee5\u901a\u8fc7\u5c06\u51fd\u6570\u5f0f\u63a5\u53e3\u4f5c\u4e3a\u53c2\u6570\u6216\u8fd4\u56de\u7c7b\u578b\u4f20\u9012\uff0c\u5728\u4e0d\u540c\u4e0a\u4e0b\u6587\u4e2d\u91cd\u7528\u884c\u4e3a\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5305\u542b\u6574\u6570\u5217\u8868\u7684\u6570\u7ec4\uff0c\u5e76\u4e14\u6211\u4eec\u5e0c\u671b\u5bf9\u6bcf\u4e2a\u6574\u6570\u6267\u884c\u4e00\u4e9b\u8ba1\u7b97\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u63a5\u53e3\u6765\u7b80\u6d01\u4e14\u53ef\u91cd\u7528\u5730\u5b8c\u6210\u6b64\u4efb\u52a1\u3002<\/p>\n
import java.util.Arrays;\nimport java.util.function.UnaryOperator;\n\npublic class Main {\n    public static void main(String[] args) {\n        int[] numbers = {1, 2, 3, 4, 5};\n\n        \/\/ \u5b9a\u4e49\u5e73\u65b9\u64cd\u4f5c\n        UnaryOperator<Integer> square = n -> n * n;\n\n        \/\/ \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5bf9\u6bcf\u4e2a\u6574\u6570\u8fdb\u884c\u5e73\u65b9\n        int[] squaredNumbers = Arrays.stream(numbers)\n                                    .map(square)\n                                    .toArray();\n\n        \/\/ \u6253\u5370\u5e73\u65b9\u540e\u7684\u6574\u6570\n        System.out.println(Arrays.toString(squaredNumbers));\n    }\n}<\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u533f\u540d\u51fd\u6570\u5f0f\u63a5\u53e3 UnaryOperator<Integer><\/code> \u5b9a\u4e49\u5e73\u65b9\u64cd\u4f5c\u3002\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528 map()<\/code> \u65b9\u6cd5\u5c06\u6b64\u64cd\u4f5c\u5e94\u7528\u4e8e\u6574\u6570\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u3002\u8fd9\u63d0\u4f9b\u4e86\u7b80\u6d01\u548c\u53ef\u91cd\u7528\u7684\u65b9\u5f0f\u6765\u5bf9\u6bcf\u4e2a\u6574\u6570\u6267\u884c\u8ba1\u7b97\u3002<\/p>\n
\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aJava\u51fd\u6570\u5f0f\u63a5\u53e3\u5728\u4ee3\u7801\u7b80\u6d01\u548c\u590d\u7528\u6027\u65b9\u9762\u7684\u4f18\u52bf\uff1f\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03\u6587\u7ae0\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u51fd\u6570\u5f0f\u63a5\u53e3\u5728\u4ee3\u7801\u7b80\u6d01\u548c\u590d...<\/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-202944","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202944","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=202944"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202944\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202944"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202944"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}