{"id":202986,"date":"2025-05-22T10:00:28","date_gmt":"2025-05-22T02:00:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202986\/"},"modified":"2025-05-22T10:00:28","modified_gmt":"2025-05-22T02:00:28","slug":"java-lambda%e8%a1%a8%e8%be%be%e5%bc%8f%e4%b8%8e%e5%8c%bf%e5%90%8d%e5%86%85%e9%83%a8%e7%b1%bb%e7%9a%84%e6%af%94%e8%be%83","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202986\/","title":{"rendered":"Java lambda\u8868\u8fbe\u5f0f\u4e0e\u533f\u540d\u5185\u90e8\u7c7b\u7684\u6bd4\u8f83"},"content":{"rendered":"

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

Java lambda\u8868\u8fbe\u5f0f\u4e0e\u533f\u540d\u5185\u90e8\u7c7b\u7684\u6bd4\u8f83<\/h1>\n

\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898\u662f<\/span>\u300aJava lambda\u8868\u8fbe\u5f0f\u4e0e\u533f\u540d\u5185\u90e8\u7c7b\u7684\u6bd4\u8f83\u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8e\u6587\u7ae0<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span><\/p>\n

lambda\u8868\u8fbe\u5f0f\u4e0e\u533f\u540d\u5185\u90e8\u7c7b\u6bd4\u8f83\uff1alambda\u8868\u8fbe\u5f0f\u66f4\u7b80\u6d01\uff0c\u7f16\u8bd1\u5668\u53ef\u4ee5\u63a8\u65ad\u7c7b\u578b\uff0c\u4f46\u4e0d\u80fd\u8bbf\u95ee\u5916\u90e8\u5b9e\u4f8b\u65b9\u6cd5\u4e2d\u7684this\u5173\u952e\u5b57\uff1b\u533f\u540d\u5185\u90e8\u7c7b\u66f4\u7075\u6d3b\uff0c\u53ef\u4ee5\u8bbf\u95eethis\u5173\u952e\u5b57\uff0c\u4f46\u8bed\u6cd5\u66f4\u590d\u6742\u3002<\/p>\n

<\/p>\n

Java lambda\u8868\u8fbe\u5f0f\u4e0e\u533f\u540d\u5185\u90e8\u7c7b\u7684\u6bd4\u8f83<\/strong><\/p>\n

\u4ecb\u7ecd<\/strong><\/p>\n

lambda\u8868\u8fbe\u5f0f\u548c\u533f\u540d\u5185\u90e8\u7c7b\u90fd\u662fJava\u4e2d\u5b9e\u73b0\u533f\u540d\u51fd\u6570\u7684\u65b9\u6cd5\u3002lambda\u8868\u8fbe\u5f0f\u662fJava 8\u4e2d\u5f15\u5165\u7684\u4e00\u9879\u65b0\u529f\u80fd\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u6d01\u660e\u4e86\u7684\u65b9\u5f0f\u6765\u7f16\u5199\u533f\u540d\u51fd\u6570\u3002\u533f\u540d\u5185\u90e8\u7c7b\u662f\u4e00\u79cd\u66f4\u4f20\u7edf\u7684\u533f\u540d\u51fd\u6570\u5b9e\u73b0\u65b9\u5f0f\uff0c\u5728Java 8\u4e4b\u524d\u5c31\u5df2\u5b58\u5728\u3002<\/p>\n

\u8bed\u6cd5<\/strong><\/p>\n

lambda\u8868\u8fbe\u5f0f\uff1a<\/strong><\/p>\n

(parameters) -> { body }<\/pre>\n
\u533f\u540d\u5185\u90e8\u7c7b\uff1a<\/strong><\/p>\n
new InterfaceOrClass() {\n    @Override\n    public void method() {\n        \/\/ body\n    }\n};<\/pre>\n
\u6bd4\u8f83<\/strong><\/p>\n
\u7b80\u6d01\u6027\uff1a<\/strong>lambda\u8868\u8fbe\u5f0f\u6bd4\u533f\u540d\u5185\u90e8\u7c7b\u66f4\u7b80\u6d01\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u521b\u5efa\u4e00\u4e2a\u63a5\u6536\u6574\u6570\u5e76\u8fd4\u56de\u5176\u5e73\u65b9\u503c\u7684lambda\u8868\u8fbe\u5f0f\uff1a<\/p>\n
(n) -> n * n<\/pre>\n
\u800c\u533f\u540d\u5185\u90e8\u7c7b\u5b9e\u73b0\u76f8\u540c\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
new Function<Integer, Integer>() {\n    @Override\n    public Integer apply(Integer n) {\n        return n * n;\n    }\n};<\/pre>\n
\u7c7b\u578b\u63a8\u65ad\uff1a<\/strong>lambda\u8868\u8fbe\u5f0f\u4e2d\u7684\u53c2\u6570\u7c7b\u578b\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u53ef\u4ee5\u7531\u7f16\u8bd1\u5668\u63a8\u65ad\u3002\u8fd9\u610f\u5473\u7740\u4f60\u4e0d\u5fc5\u663e\u5f0f\u6307\u5b9a\u5b83\u4eec\uff0c\u8fd9\u6709\u52a9\u4e8e\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7b80\u6d01\u6027\u3002<\/p>\n
\u5b9e\u4f8b\u65b9\u6cd5\uff1a<\/strong>lambda\u8868\u8fbe\u5f0f\u4e0d\u80fd\u8bbf\u95ee\u5916\u90e8\u5b9e\u4f8b\u65b9\u6cd5\u4e2d\u7684this\u5173\u952e\u5b57\u3002\u800c\u533f\u540d\u5185\u90e8\u7c7b\u53ef\u4ee5\u8bbf\u95eethis\u5173\u952e\u5b57\uff0c\u5373\u4f7f\u8be5\u7c7b\u6ca1\u6709\u5b9e\u73b0\u4efb\u4f55\u63a5\u53e3\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u4f7f\u7528lambda\u8868\u8fbe\u5f0f\uff1a<\/strong><\/p>\n
List<Integer> numbers = List.of(1, 2, 3, 4, 5);\nnumbers.forEach(n -> System.out.println(n));<\/pre>\n
\u4f7f\u7528\u533f\u540d\u5185\u90e8\u7c7b\uff1a<\/strong><\/p>\n
List<Integer> numbers = List.of(1, 2, 3, 4, 5);\nnumbers.forEach(new Consumer<Integer>() {\n    @Override\n    public void accept(Integer n) {\n        System.out.println(n);\n    }\n});<\/pre>\n
\u7ed3\u8bba<\/strong><\/p>\n
lambda\u8868\u8fbe\u5f0f\u548c\u533f\u540d\u5185\u90e8\u7c7b\u90fd\u662f\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u7528\u4e8e\u7f16\u5199\u533f\u540d\u51fd\u6570\u3002lambda\u8868\u8fbe\u5f0f\u66f4\u7b80\u6d01\u4e14\u6613\u4e8e\u9605\u8bfb\uff0c\u800c\u533f\u540d\u5185\u90e8\u7c7b\u66f4\u7075\u6d3b\uff0c\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u5b9e\u4f8b\u65b9\u6cd5\u4e2d\u7684this\u5173\u952e\u5b57\u3002\u6839\u636e\u5177\u4f53\u60c5\u51b5\uff0c\u9009\u62e9\u6700\u5408\u9002\u7684\u5de5\u5177\u662f\u91cd\u8981\u7684\u3002<\/p>\n
\u6587\u4e2d\u5173\u4e8e\u533f\u540d\u5185\u90e8\u7c7b\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300aJava lambda\u8868\u8fbe\u5f0f\u4e0e\u533f\u540d\u5185\u90e8\u7c7b\u7684\u6bd4\u8f83\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Java lambda\u8868\u8fbe\u5f0f\u4e0e\u533f...<\/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-202986","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202986","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=202986"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202986\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}