{"id":202652,"date":"2025-05-22T08:45:00","date_gmt":"2025-05-22T00:45:00","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202652\/"},"modified":"2025-05-22T08:45:00","modified_gmt":"2025-05-22T00:45:00","slug":"lambda%e8%a1%a8%e8%be%be%e5%bc%8f%e5%a6%82%e4%bd%95%e6%8f%90%e9%ab%98java%e4%bb%a3%e7%a0%81%e7%9a%84%e5%8f%af%e8%af%bb%e6%80%a7%e5%92%8c%e5%8f%af%e7%bb%b4%e6%8a%a4%e6%80%a7%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202652\/","title":{"rendered":"lambda\u8868\u8fbe\u5f0f\u5982\u4f55\u63d0\u9ad8Java\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff1f"},"content":{"rendered":"

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

lambda\u8868\u8fbe\u5f0f\u5982\u4f55\u63d0\u9ad8Java\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff1f<\/h1>\n

\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662f\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u300alambda\u8868\u8fbe\u5f0f\u5982\u4f55\u63d0\u9ad8Java\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff1f\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01<\/p>\n

Lambda \u8868\u8fbe\u5f0f\u63d0\u9ad8\u4e86 Java \u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u5b83\u4eec\u5141\u8bb8\u6211\u4eec\u7b80\u6d01\u5730\u8868\u793a\u51fd\u6570\u5f0f\u6982\u5ff5\uff0c\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\uff1a\u6d88\u9664\u5bf9\u533f\u540d\u5185\u90e8\u7c7b\u7684\u9700\u6c42\uff0c\u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\u3002\u7b80\u5316\u4ee3\u7801\u7ef4\u62a4\uff0c\u51cf\u5c11\u81c3\u80bf\u7684\u5185\u90e8\u7c7b\u3002\u4fc3\u8fdb\u4ee3\u7801\u91cd\u7528\uff0c\u5c06\u51fd\u6570\u5f0f\u884c\u4e3a\u5c01\u88c5\u6210\u53ef\u91cd\u7528\u7ec4\u4ef6\u3002<\/p>\n

<\/p>\n

Lambda \u8868\u8fbe\u5f0f\uff1a\u63d0\u5347 Java \u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u4e0e\u53ef\u7ef4\u62a4\u6027<\/strong><\/p>\n

\u5728 Java \u7f16\u7a0b\u4e2d\uff0cLambda \u8868\u8fbe\u5f0f\u5141\u8bb8\u6211\u4eec\u4ee5\u7b80\u6d01\u6613\u61c2\u7684\u65b9\u5f0f\u5904\u7406\u51fd\u6570\u5f0f\u7f16\u7a0b\u4efb\u52a1\u3002\u901a\u8fc7\u6d88\u9664\u5bf9\u533f\u540d\u5185\u90e8\u7c7b\u7684\u9700\u6c42\uff0c\u5b83\u4eec\u663e\u8457\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n

\u6982\u89c8<\/strong><\/p>\n

lambda \u8868\u8fbe\u5f0f\u662f\u7528\u5706\u62ec\u53f7\u62ec\u8d77\u6765\u7684\u4ee3\u7801\u7247\u6bb5\uff0c\u5b83\u8868\u793a\u4e00\u4e2a\u51fd\u6570\u3002\u5b83\u63a5\u53d7\u4efb\u610f\u6570\u91cf\u7684\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\u3002lambda \u8868\u8fbe\u5f0f\u901a\u5e38\u7528\u4e8e\u9700\u8981\u4f20\u9012\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6216\u5728\u96c6\u5408\u4e0a\u6267\u884c\u64cd\u4f5c\u7684\u573a\u666f\u3002<\/p>\n

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

(param1, param2, ...) -> {\n  \/\/ \u4ee3\u7801\u5757\n  return result;\n}<\/pre>\n
    \n
  • \u53c2\u6570\u5217\u8868\uff1a<\/strong>\u4e0e\u65b9\u6cd5\u7b7e\u540d\u7c7b\u4f3c\uff0c\u5b83\u6307\u5b9a lambda \u8868\u8fbe\u5f0f\u63a5\u6536\u7684\u53c2\u6570\u3002<\/li>\n
  • \u4ee3\u7801\u5757\uff1a<\/strong>\u5305\u542b\u8981\u6267\u884c\u7684\u4ee3\u7801\u3002<\/li>\n
  • \u8fd4\u56de\u7c7b\u578b\uff1a<\/strong>\u5982\u679c lambda \u8868\u8fbe\u5f0f\u8fd4\u56de\u4e00\u4e2a\u503c\uff0c\u5219\u9700\u8981\u663e\u5f0f\u6307\u5b9a\u8fd4\u56de\u7c7b\u578b\u3002\u5982\u679c\u6ca1\u6709\u6307\u5b9a\uff0c\u5b83\u5c06\u63a8\u65ad\u51fa\u8fd4\u56de\u7c7b\u578b\uff0c\u7c7b\u4f3c\u4e8e\u65b9\u6cd5\u4e2d\u7684\u9690\u5f0f\u8fd4\u56de\u3002<\/li>\n<\/ul>\n
    \u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
    \u6392\u5e8f\u5217\u8868<\/strong><\/p>\n
    \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u94fe\u8868\u6309\u81ea\u7136\u987a\u5e8f\u8fdb\u884c\u6392\u5e8f\uff1a<\/p>\n
    List<Integer> numbers = Arrays.asList(3, 1, 4, 2, 5);\nCollections.sort(numbers, (Integer a, Integer b) -> a - b);\nSystem.out.println(numbers); \/\/ \u8f93\u51fa\uff1a[1, 2, 3, 4, 5]<\/pre>\n
    \u8fc7\u6ee4\u96c6\u5408<\/strong><\/p>\n
    lambda \u8868\u8fbe\u5f0f\u5141\u8bb8\u6211\u4eec\u4ee5\u58f0\u660e\u6027\u65b9\u5f0f\u4ece\u96c6\u5408\u4e2d\u8fc7\u6ee4\u5143\u7d20\uff1a<\/p>\n
    List<String> names = Arrays.asList(\"Alice\", \"Bob\", \"Charlie\");\nList<String> filteredNames = names.stream()\n    .filter(name -> name.startsWith(\"C\"))\n    .toList();\nSystem.out.println(filteredNames); \/\/ \u8f93\u51fa\uff1a[Charlie]<\/pre>\n
    \u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u51fd\u6570<\/strong><\/p>\n
    lambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u4f5c\u4e3a\u5176\u4ed6\u65b9\u6cd5\u7684\u53c2\u6570\u4f20\u9012\uff0c\u5141\u8bb8\u6211\u4eec\u52a8\u6001\u4f20\u9012\u884c\u4e3a\uff1a<\/p>\n
    public static void processData(Function<String, Integer> converter) {\n  List<String> data = ...;\n  List<Integer> result = data.stream()\n      .map(converter)\n      .toList();\n}\n\n\/\/ \u7528\u6cd5\uff1a\nprocessData(str -> str.length());<\/pre>\n
    \u4f18\u70b9<\/strong><\/p>\n
    \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u4f18\u52bf\uff1a<\/p>\n
      \n
    • \u53ef\u8bfb\u6027\u66f4\u5f3a\uff1a<\/strong>\u901a\u8fc7\u4f7f\u7528\u7b80\u77ed\u3001\u6613\u61c2\u7684\u8bed\u6cd5\uff0clambda \u8868\u8fbe\u5f0f\u6d88\u9664\u4e86\u5bf9\u533f\u540d\u5185\u90e8\u7c7b\u7684\u9700\u6c42\uff0c\u4ece\u800c\u4f7f\u4ee3\u7801\u66f4\u5bb9\u6613\u9605\u8bfb\u548c\u7406\u89e3\u3002<\/li>\n
    • \u53ef\u7ef4\u62a4\u6027\u66f4\u597d\uff1a<\/strong>\u5220\u9664\u4e86\u81c3\u80bf\u7684\u533f\u540d\u5185\u90e8\u7c7b\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u6613\u4e8e\u91cd\u6784\u548c\u7ef4\u62a4\u3002<\/li>\n
    • \u4ee3\u7801\u91cd\u7528\uff1a<\/strong>lambda \u8868\u8fbe\u5f0f\u5141\u8bb8\u6211\u4eec\u65b9\u4fbf\u5730\u5c06\u51fd\u6570\u5f0f\u884c\u4e3a\u5c01\u88c5\u6210\u53ef\u91cd\u7528\u7684\u7ec4\u4ef6\u3002<\/li>\n<\/ul>\n
      \u7ed3\u8bba<\/strong><\/p>\n
      lambda \u8868\u8fbe\u5f0f\u662f Java \u4e2d\u4e00\u79cd\u529f\u80fd\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u5b83\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u901a\u8fc7\u63d0\u4f9b\u7b80\u6d01\u7684\u51fd\u6570\u5b9a\u4e49\u548c\u51cf\u5c11\u533f\u540d\u5185\u90e8\u7c7b\u7684\u4f7f\u7528\uff0clambda \u8868\u8fbe\u5f0f\u4f7f\u4ee3\u7801\u66f4\u5bb9\u6613\u7406\u89e3\u548c\u7ba1\u7406\u3002<\/p>\n
      \u4eca\u5929\u5173\u4e8e\u300alambda\u8868\u8fbe\u5f0f\u5982\u4f55\u63d0\u9ad8Java\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff1f\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":"
      lambda\u8868\u8fbe\u5f0f\u5982\u4f55\u63d0\u9ad8Jav...<\/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-202652","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202652","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=202652"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202652\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202652"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202652"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}