{"id":203087,"date":"2025-05-22T10:54:43","date_gmt":"2025-05-22T02:54:43","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203087\/"},"modified":"2025-05-22T10:54:43","modified_gmt":"2025-05-22T02:54:43","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8lambda%e8%a1%a8%e8%be%be%e5%bc%8f%e5%ae%9e%e7%8e%b0%e6%8e%a5%e5%8f%a3%e6%96%b9%e6%b3%95%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203087\/","title":{"rendered":"\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528lambda\u8868\u8fbe\u5f0f\u5b9e\u73b0\u63a5\u53e3\u65b9\u6cd5\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528lambda\u8868\u8fbe\u5f0f\u5b9e\u73b0\u63a5\u53e3\u65b9\u6cd5\uff1f<\/h1>\n

\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528lambda\u8868\u8fbe\u5f0f\u5b9e\u73b0\u63a5\u53e3\u65b9\u6cd5\uff1f\u300b<\/span>\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\uff0c\u6216\u8005\u662f\u5bf9\u6587\u7ae0<\/span>\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01<\/p>\n

<\/p>\n

\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9e\u73b0\u63a5\u53e3\u65b9\u6cd5<\/strong><\/p>\n

Java 8 \u5f15\u5165\u4e86 lambda \u8868\u8fbe\u5f0f\uff0c\u5b83\u63d0\u4f9b\u4e86\u7b80\u6d01\u4e14\u65b9\u4fbf\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\u63a5\u53e3\u65b9\u6cd5\u3002lambda \u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u533f\u540d\u51fd\u6570\uff0c\u5b83\u53ef\u4ee5\u7528\u6765\u66ff\u6362\u5b9e\u73b0\u63a5\u53e3\u65b9\u6cd5\u7684\u5e38\u89c4\u7c7b\u3002<\/p>\n

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

\u5b9e\u73b0\u63a5\u53e3\u65b9\u6cd5\u7684 lambda \u8868\u8fbe\u5f0f\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

(argument-list) -> expression<\/pre>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a ILogger<\/code> \u63a5\u53e3\uff0c\u5b83\u58f0\u660e\u4e86\u4e00\u4e2a log(String message)<\/code> \u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5982\u4e0b\u5b9e\u73b0\u8be5\u65b9\u6cd5\uff1a<\/p>\n
ILogger logger = (message) -> System.out.println(message);<\/pre>\n
\u73b0\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u50cf\u4f7f\u7528\u666e\u901a\u63a5\u53e3\u5b9e\u73b0\u4e00\u6837\u4f7f\u7528 logger<\/code>\uff1a<\/p>\n
logger.log(\"Hello, world!\");<\/pre>\n
\u8f93\u51fa\uff1a<\/p>\n
Hello, world!<\/pre>\n
\u66ff\u4ee3\u4f20\u7edf\u5b9e\u73b0<\/strong><\/p>\n
lambda \u8868\u8fbe\u5f0f\u4e3a\u5b9e\u73b0\u63a5\u53e3\u65b9\u6cd5\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u6d01\u7684\u66ff\u4ee3\u65b9\u6848\uff0c\u53ef\u4ee5\u51cf\u5c11\u4ee3\u7801\u91cf\u5e76\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002\u5728\u4f20\u7edf\u5b9e\u73b0\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u5b9e\u73b0 ILogger<\/code> \u63a5\u53e3\u7684\u7c7b\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
public class MyLogger implements ILogger {\n    @Override\n    public void log(String message) {\n        System.out.println(message);\n    }\n}<\/pre>\n
\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u66f4\u7b80\u6d01\u7684\u8bed\u6cd5\u83b7\u5f97\u76f8\u540c\u7684\u7ed3\u679c\uff1a<\/p>\n
ILogger logger = (message) -> System.out.println(message);<\/pre>\n
\u5176\u4ed6\u7528\u9014<\/strong><\/p>\n
lambda \u8868\u8fbe\u5f0f\u8fd8\u53ef\u4ee5\u7528\u4e8e\u4ee5\u4e0b\u5176\u4ed6\u7528\u9014\uff1a<\/p>\n
    \n
  • \u4f5c\u4e3a\u65b9\u6cd5\u53c2\u6570<\/li>\n
  • \u4f5c\u4e3a\u7ebf\u7a0b\u5bf9\u8c61<\/li>\n
  • \u5728\u6d41\u5904\u7406\u4e2d\uff08Java 8 Streams\uff09<\/li>\n<\/ul>\n
    \u4f18\u52bf<\/strong><\/p>\n
    \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9e\u73b0\u63a5\u53e3\u65b9\u6cd5\u5177\u6709\u4ee5\u4e0b\u4f18\u52bf\uff1a<\/p>\n
      \n
    • \u7b80\u6d01\u6027\uff1a\u4ee3\u7801\u66f4\u7b80\u6d01\u4e14\u53ef\u8bfb\u6027\u66f4\u9ad8\u3002<\/li>\n
    • \u7075\u6d3b\u6027\uff1alambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u8f7b\u677e\u5730\u4f20\u9012\u7ed9\u5176\u4ed6\u65b9\u6cd5\u4f5c\u4e3a\u53c2\u6570\u3002<\/li>\n
    • \u53ef\u91cd\u7528\u6027\uff1alambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u7528\u4e8e\u5728\u4e0d\u540c\u4e0a\u4e0b\u6587\u4e2d\u5b9e\u73b0\u76f8\u540c\u7684\u63a5\u53e3\u65b9\u6cd5\u3002<\/li>\n<\/ul>\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":"
      \u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528lambda...<\/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-203087","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203087","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=203087"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203087\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203087"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203087"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203087"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}