{"id":202580,"date":"2025-05-22T10:00:45","date_gmt":"2025-05-22T02:00:45","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202580\/"},"modified":"2025-05-22T10:00:45","modified_gmt":"2025-05-22T02:00:45","slug":"%e9%ab%98%e9%98%b6%e5%87%bd%e6%95%b0%e4%b8%8e-lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%e5%9c%a8-java-%e4%b8%ad%e7%9a%84%e5%85%b3%e7%b3%bb","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202580\/","title":{"rendered":"\u9ad8\u9636\u51fd\u6570\u4e0e Lambda \u8868\u8fbe\u5f0f\u5728 Java \u4e2d\u7684\u5173\u7cfb"},"content":{"rendered":"

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

\u9ad8\u9636\u51fd\u6570\u4e0e Lambda \u8868\u8fbe\u5f0f\u5728 Java \u4e2d\u7684\u5173\u7cfb<\/h1>\n

\u5c0f\u4f19\u4f34\u4eec\u5bf9\u6587\u7ae0\u7f16\u7a0b\u611f\u5174\u8da3\u5417\uff1f\u662f\u5426\u6b63\u5728\u5b66\u4e60\u76f8\u5173\u77e5\u8bc6\u70b9\uff1f\u5982\u679c\u662f\uff0c\u90a3\u4e48\u672c\u6587\u300a\u9ad8\u9636\u51fd\u6570\u4e0e Lambda \u8868\u8fbe\u5f0f\u5728 Java \u4e2d\u7684\u5173\u7cfb\u300b\uff0c\u5c31\u5f88\u9002\u5408\u4f60\uff0c\u672c\u7bc7\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec\u3002\u5728\u4e4b\u540e\u7684\u6587\u7ae0\u4e2d\u4e5f\u4f1a\u591a\u591a\u5206\u4eab\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n

\u9ad8\u9636\u51fd\u6570\u5141\u8bb8\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6216\u8fd4\u56de\u503c\uff1bLambda \u8868\u8fbe\u5f0f\u7b80\u5316\u4e86\u7f16\u5199\u533f\u540d\u51fd\u6570\uff0c\u7ecf\u5e38\u4e0e\u9ad8\u9636\u51fd\u6570\u4e00\u8d77\u4f7f\u7528\u3002\u9ad8\u9636\u51fd\u6570\u5305\u62ec\uff1a\u63a5\u6536\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u7684 forEach\uff0cLambda \u8868\u8fbe\u5f0f\u793a\u4f8b\u5305\u62ec\u5c06\u6570\u5b57\u6253\u5370\u5230\u63a7\u5236\u53f0\u3002\u901a\u8fc7\u9ad8\u9636\u51fd\u6570\u548c Lambda \u8868\u8fbe\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u8fc7\u6ee4\u6574\u6570\u5217\u8868\u4e2d\u7684\u5076\u6570\uff0c\u4f8b\u5982\uff0c\u4ece [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] \u4e2d\u63d0\u53d6 [2, 4, 6, 8, 10]\u3002<\/p>\n

<\/p>\n

\u9ad8\u9636\u51fd\u6570\u4e0e Lambda \u8868\u8fbe\u5f0f\u5728 Java \u4e2d\u7684\u5173\u7cfb<\/strong><\/p>\n

\u5728 Java \u4e2d\uff0c\u9ad8\u9636\u51fd\u6570\u5141\u8bb8\u4f60\u5c06\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u5176\u4ed6\u51fd\u6570\uff0c\u6216\u5c06\u51fd\u6570\u4f5c\u4e3a\u8fd4\u56de\u503c\u3002Lambda \u8868\u8fbe\u5f0f\u662f\u65e0\u540d\u79f0\u51fd\u6570\u7684\u7b80\u5199\u5f62\u5f0f\uff0c\u53ef\u4ee5\u5e2e\u52a9\u4f60\u4ee5\u66f4\u7b80\u6d01\u7684\u65b9\u5f0f\u7f16\u5199\u9ad8\u9636\u51fd\u6570\u3002<\/p>\n

\u9ad8\u9636\u51fd\u6570<\/strong><\/p>\n

\u4e00\u4e2a\u9ad8\u9636\u51fd\u6570\u53ef\u4ee5\u63a5\u6536\u4e00\u4e2a\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6216\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570\u3002\u4ee5\u4e0b\u662f\u9ad8\u9636\u51fd\u6570\u7684\u793a\u4f8b\uff1a<\/p>\n

\/\/ \u63a5\u6536\u4e00\u4e2a\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\nvoid forEach(List<Integer> numbers, Function<Integer, Void> lambda) {\n  for (Integer number : numbers) {\n    lambda.apply(number);\n  }\n}<\/pre>\n
Lambda \u8868\u8fbe\u5f0f<\/strong><\/p>\n
Lambda \u8868\u8fbe\u5f0f\u662f\u533f\u540d\u51fd\u6570\u7684\u7b80\u5199\u5f62\u5f0f\u3002Lambda \u8868\u8fbe\u5f0f\u7531\u4e00\u4e2a\u53c2\u6570\u5217\u8868\u3001\u4e00\u4e2a\u7bad\u5934\u7b26\u53f7 (->) \u548c\u4e00\u4e2a\u51fd\u6570\u4f53\u7ec4\u6210\u3002\u4ee5\u4e0b\u662f Lambda \u8868\u8fbe\u5f0f\u7684\u793a\u4f8b\uff1a<\/p>\n
(Integer number) -> System.out.println(number);<\/pre>\n
\u8fd9\u4e2a Lambda \u8868\u8fbe\u5f0f\u63a5\u53d7\u4e00\u4e2a\u6574\u6570\u53c2\u6570\u5e76\u6253\u5370\u8be5\u6570\u5b57\u3002<\/p>\n
\u9ad8\u9636\u51fd\u6570\u4e0e Lambda \u8868\u8fbe\u5f0f\u7684\u5173\u7cfb<\/strong><\/p>\n
Lambda \u8868\u8fbe\u5f0f\u7ecf\u5e38\u4e0e\u9ad8\u9636\u51fd\u6570\u4e00\u8d77\u4f7f\u7528\uff0c\u56e0\u4e3a\u5b83\u63d0\u4f9b\u4e86\u66f4\u5bb9\u6613\u7f16\u5199\u533f\u540d\u51fd\u6570\u7684\u65b9\u5f0f\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5c06 forEach<\/code> \u51fd\u6570\u91cd\u5199\u4e3a\uff1a<\/p>\n
void forEach(List<Integer> numbers) {\n  numbers.forEach(number -> System.out.println(number));\n}<\/pre>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u8ba9\u6211\u4eec\u4f7f\u7528\u9ad8\u9636\u51fd\u6570\u548c Lambda \u8868\u8fbe\u5f0f\u8fc7\u6ee4\u4e00\u4e2a\u6574\u6570\u5217\u8868\u4e2d\u7684\u5076\u6570\uff1a<\/p>\n
List<Integer> numbers = List.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\n\nList<Integer> evenNumbers = numbers.stream()\n  .filter(number -> number % 2 == 0)\n  .toList();\n\nSystem.out.println(evenNumbers); \/\/ \u8f93\u51fa\uff1a [2, 4, 6, 8, 10]<\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528 stream<\/code> \u65b9\u6cd5\u548c filter<\/code> \u9ad8\u9636\u51fd\u6570\u8fc7\u6ee4\u5217\u8868\u4e2d\u7684\u5076\u6570\u3002filter<\/code> \u51fd\u6570\u63a5\u53d7\u4e00\u4e2a Lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\uff0c\u8be5\u8868\u8fbe\u5f0f\u68c0\u67e5\u6bcf\u4e2a\u5143\u7d20\u662f\u5426\u662f\u5076\u6570\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300a\u9ad8\u9636\u51fd\u6570\u4e0e Lambda \u8868\u8fbe\u5f0f\u5728 Java \u4e2d\u7684\u5173\u7cfb\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":"
\u9ad8\u9636\u51fd\u6570\u4e0e Lambda \u8868\u8fbe\u5f0f...<\/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-202580","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202580","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=202580"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202580\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202580"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202580"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202580"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}