{"id":202976,"date":"2025-05-22T09:01:48","date_gmt":"2025-05-22T01:01:48","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202976\/"},"modified":"2025-05-22T09:01:48","modified_gmt":"2025-05-22T01:01:48","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%e5%ae%9a%e4%b9%89-java-%e5%87%bd%e6%95%b0%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202976\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9a\u4e49 Java \u51fd\u6570\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9a\u4e49 Java \u51fd\u6570\uff1f<\/h1>\n

\u5bf9\u4e8e\u4e00\u4e2a\u6587\u7ae0\u5f00\u53d1\u8005\u6765\u8bf4\uff0c\u7262\u56fa\u624e\u5b9e\u7684\u57fa\u7840\u662f\u5341\u5206\u91cd\u8981\u7684\uff0c\u5c31\u6765\u5e26\u5927\u5bb6\u4e00\u70b9\u70b9\u7684\u638c\u63e1\u57fa\u7840\u77e5\u8bc6\u70b9\u3002\u4eca\u5929\u672c\u7bc7\u6587\u7ae0\u5e26\u5927\u5bb6\u4e86\u89e3\u300a\u5982\u4f55\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9a\u4e49 Java \u51fd\u6570\uff1f\u300b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e86\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u5feb\u70b9\u6536\u85cf\u8d77\u6765\u5427\uff0c\u5426\u5219\u9700\u8981\u65f6\u5c31\u627e\u4e0d\u5230\u4e86\uff01<\/p>\n

\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9a\u4e49 Java \u51fd\u6570\uff1a\u8bed\u6cd5\uff1a(argument-list) -> expression\uff0c\u5176\u4e2d argument-list \u4e3a\u53c2\u6570\u5217\u8868\uff0cexpression \u4e3a\u51fd\u6570\u4e3b\u4f53\u3002\u6848\u4f8b\uff1amap(name -> name.toUpperCase()) \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u3002\u533f\u540d\u51fd\u6570\uff1alambda \u8868\u8fbe\u5f0f\u662f\u533f\u540d\u51fd\u6570\uff0c\u6ca1\u6709\u540d\u79f0\u3002\u4f18\u70b9\uff1a\u7b80\u660e\u6027\u3001\u53ef\u8bfb\u6027\u3001\u6027\u80fd\u63d0\u5347\u3002<\/p>\n

<\/p>\n

\u5982\u4f55\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9a\u4e49 Java \u51fd\u6570<\/strong><\/p>\n

Lambda \u8868\u8fbe\u5f0f\u662f Java 8 \u4e2d\u5f15\u5165\u7684\u4e00\u79cd\u7b80\u6d01\u65b9\u5f0f\uff0c\u53ef\u7528\u4e8e\u5b9a\u4e49\u51fd\u6570\u3002\u5b83\u4eec\u5141\u8bb8\u60a8\u4f7f\u7528\u533f\u540d\u51fd\u6570\u6765\u7b80\u6d01\u9ad8\u6548\u5730\u6267\u884c\u7b80\u77ed\u64cd\u4f5c\u3002<\/p>\n

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

lambda \u8868\u8fbe\u5f0f\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

(argument-list) -> expression<\/pre>\n
\u5176\u4e2d\uff1a<\/p>\n
    \n
  • argument-list<\/code>\uff1a\u51fd\u6570\u7684\u53c2\u6570\u5217\u8868\u3002<\/li>\n
  • expression<\/code>\uff1a\u51fd\u6570\u7684\u4e3b\u4f53\u3002<\/li>\n<\/ul>\n
    \u6848\u4f8b<\/strong><\/p>\n
    \u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u7684\u5b9e\u6218\u6848\u4f8b\uff1a<\/p>\n
    List<String> names = List.of(\"John\", \"Jane\", \"Michael\");\nList<String> upperNames = names.stream()\n    .map(name -> name.toUpperCase())\n    .toList();<\/pre>\n
    \u5728\u6b64\u4ee3\u7801\u4e2d\uff1a<\/p>\n
      \n
    • map<\/code> \u65b9\u6cd5\u63a5\u6536\u4e00\u4e2a lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\uff0c\u8be5\u8868\u8fbe\u5f0f\u5c06\u6bcf\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u3002<\/li>\n
    • lambda \u8868\u8fbe\u5f0f name -> name.toUpperCase()<\/code> \u63a5\u6536\u4e00\u4e2a name<\/code> \u53c2\u6570\u5e76\u8fd4\u56de\u5176\u5927\u5199\u7248\u672c\u3002<\/li>\n
    • \u6700\u7ec8\uff0cupperNames<\/code> \u53d8\u91cf\u5305\u542b\u8f6c\u6362\u540e\u7684\u5217\u8868\u3002<\/li>\n<\/ul>\n
      \u533f\u540d\u51fd\u6570<\/strong><\/p>\n
      lambda \u8868\u8fbe\u5f0f\u662f\u533f\u540d\u51fd\u6570\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u6ca1\u6709\u540d\u79f0\u3002\u5b83\u4eec\u53ef\u4ee5\u76f4\u63a5\u5728\u9700\u8981\u5b83\u4eec\u7684\u5730\u65b9\u4f7f\u7528\u3002<\/p>\n
      \u4f18\u70b9<\/strong><\/p>\n
      \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9a\u4e49 Java \u51fd\u6570\u6709\u4e00\u4e9b\u4f18\u70b9\uff1a<\/p>\n
        \n
      • \u7b80\u660e\u6027\uff1a<\/strong>lambda \u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u7b80\u5316\u4ee3\u7801\u7684\u7b80\u6d01\u65b9\u6cd5\u3002<\/li>\n
      • \u53ef\u8bfb\u6027\uff1a<\/strong>\u5b83\u4eec\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u5bb9\u6613\u9605\u8bfb\u548c\u7406\u89e3\u3002<\/li>\n
      • \u6027\u80fd\uff1a<\/strong>\u901a\u8fc7\u907f\u514d\u521b\u5efa\u5355\u72ec\u7684\u7c7b\uff0clambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<\/ul>\n
        \u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5982\u4f55\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9a\u4e49 Java \u51fd\u6570\uff1f\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u5982\u4f55\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5b9a...<\/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-202976","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202976","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=202976"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202976\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}