{"id":202767,"date":"2025-05-22T11:15:40","date_gmt":"2025-05-22T03:15:40","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202767\/"},"modified":"2025-05-22T11:15:40","modified_gmt":"2025-05-22T03:15:40","slug":"%e5%9c%a8-java-%e4%b8%ad%e5%a6%82%e4%bd%95%e9%80%9a%e8%bf%87-lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%e5%ae%9e%e7%8e%b0%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202767\/","title":{"rendered":"\u5728 Java \u4e2d\u5982\u4f55\u901a\u8fc7 Lambda \u8868\u8fbe\u5f0f\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\uff1f"},"content":{"rendered":"

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

\u5728 Java \u4e2d\u5982\u4f55\u901a\u8fc7 Lambda \u8868\u8fbe\u5f0f\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\uff1f<\/h1>\n

\u5077\u5077\u52aa\u529b\uff0c\u6084\u65e0\u58f0\u606f\u5730\u53d8\u5f3a\uff0c\u7136\u540e\u60ca\u8273\u6240\u6709\u4eba\uff01\u54c8\u54c8\uff0c\u5c0f\u4f19\u4f34\u4eec\u53c8\u6765\u5b66\u4e60\u5566~\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u300a\u5728 Java \u4e2d\u5982\u4f55\u901a\u8fc7 Lambda \u8868\u8fbe\u5f0f\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\uff1f\u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u4e0d\u77e5\u9053\u5927\u5bb6\u5bf9\u5176\u90fd\u6709\u591a\u5c11\u4e86\u89e3\uff0c\u4e0b\u9762\u6211\u4eec\u5c31\u4e00\u8d77\u6765\u770b\u4e00\u5427\uff01\u5f53\u7136\uff0c\u975e\u5e38\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u8bc4\u8bba\uff0c\u7ed9\u51fa\u5408\u7406\u7684\u5efa\u8bae\uff0c\u6211\u4eec\u4e00\u8d77\u5b66\u4e60\uff0c\u4e00\u8d77\u8fdb\u6b65\uff01<\/p>\n

\u5728 Java \u4e2d\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\uff0c\u901a\u8fc7\u6620\u5c04\u3001\u8fc7\u6ee4\u548c\u89c4\u7ea6\u64cd\u4f5c\u5bf9\u96c6\u5408\u6267\u884c\u51fd\u6570\u5f0f\u64cd\u4f5c\u3002\u6620\u5c04\u5c06\u6bcf\u4e2a\u5143\u7d20\u8f6c\u6362\u4e3a\u65b0\u503c\uff0c\u8fc7\u6ee4\u6839\u636e\u6761\u4ef6\u79fb\u9664\u5143\u7d20\uff0c\u800c\u89c4\u7ea6\u7ec4\u5408\u5143\u7d20\u5f62\u6210\u5355\u4e00\u503c\u3002\u8fd9\u4e9b\u64cd\u4f5c\u589e\u5f3a\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7b80\u6d01\u6027\uff0c\u9002\u7528\u4e8e\u6587\u672c\u5904\u7406\u7b49\u5b9e\u6218\u573a\u666f\u3002<\/p>\n

<\/p>\n

\u5728 Java \u4e2d\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u8fdb\u884c\u51fd\u6570\u5f0f\u7f16\u7a0b<\/strong><\/p>\n

\u524d\u8a00<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u5f0f\uff0c\u5b83\u5f3a\u8c03\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u7ed3\u6784\u3001\u7eaf\u51fd\u6570\u548c\u51fd\u6570\u5f0f\u8bed\u6cd5\uff0c\u800c\u4e0d\u662f\u4f9d\u8d56\u4e8e\u72b6\u6001\u548c\u526f\u4f5c\u7528\u3002\u5728 Java \u4e2d\uff0cLambda \u8868\u8fbe\u5f0f\u63d0\u4f9b\u4e86\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u578b\u7684\u5f3a\u5927\u5de5\u5177\u3002<\/p>\n

Lambda \u8868\u8fbe\u5f0f<\/strong><\/p>\n

Lambda \u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u533f\u540d\u51fd\u6570\uff0c\u5b83\u63a5\u53d7\u53c2\u6570\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\u3002\u5b83\u4eec\u4f7f\u7528\u7bad\u5934\uff08->\uff09\u7b26\u53f7\u8bed\u6cd5\u5b9a\u4e49\uff1a<\/p>\n

(args) -> expression<\/pre>\n
\u4f8b\u5982\uff0c\u4ee5\u4e0b Lambda \u8868\u8fbe\u5f0f\u8ba1\u7b97\u4e24\u4e2a\u6574\u6570\u7684\u548c\uff1a<\/p>\n
(a, b) -> a + b<\/pre>\n
\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u8fdb\u884c\u6620\u5c04\u3001\u8fc7\u6ee4\u548c\u89c4\u7ea6<\/strong><\/p>\n
Java Collections Framework \u63d0\u4f9b\u4e86 Stream<\/code> API\uff0c\u5b83\u5141\u8bb8\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5bf9\u96c6\u5408\u8fdb\u884c\u51fd\u6570\u5f0f\u64cd\u4f5c\u3002<\/p>\n
\u6620\u5c04<\/strong><\/p>\n
\u6620\u5c04\u64cd\u4f5c\u5c06\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u8f6c\u6362\u4e3a\u65b0\u7684\u503c\u3002\u5b83\u4f7f\u7528 map<\/code> \u65b9\u6cd5\uff1a<\/p>\n
List<Integer> numbers = List.of(1, 2, 3, 4, 5);\nList<Integer> squares = numbers.stream()\n    .map(n -> n * n)\n    .toList();<\/pre>\n
\u8fc7\u6ee4<\/strong><\/p>\n
\u8fc7\u6ee4\u64cd\u4f5c\u4ece\u96c6\u5408\u4e2d\u79fb\u9664\u4e0d\u6ee1\u8db3\u7ed9\u5b9a\u6761\u4ef6\u7684\u5143\u7d20\u3002\u5b83\u4f7f\u7528 filter<\/code> \u65b9\u6cd5\uff1a<\/p>\n
List<Integer> evenNumbers = numbers.stream()\n    .filter(n -> n % 2 == 0)\n    .toList();<\/pre>\n
\u89c4\u7ea6<\/strong><\/p>\n
\u89c4\u7ea6\u64cd\u4f5c\u5c06\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u7ec4\u5408\u6210\u4e00\u4e2a\u5355\u4e00\u7684\u503c\u3002\u5b83\u4f7f\u7528 reduce<\/code> \u65b9\u6cd5\uff1a<\/p>\n
int sum = numbers.stream()\n    .reduce(0, (a, b) -> a + b);<\/pre>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u6587\u672c\u5904\u7406<\/strong><\/p>\n
\u4ee5\u4e0b\u4f8b\u5b50\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5bf9\u6587\u672c\u8fdb\u884c\u5904\u7406\uff1a<\/p>\n
String text = \"Hello Java!\";\n\n\/\/ \u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u8fc7\u6ee4\u51fa\u4ee5 H \u5f00\u5934\u7684\u5355\u8bcd\nList<String> wordsStartingWithH = Arrays.asList(text.split(\" \"))\n    .stream()\n    .filter(s -> s.startsWith(\"H\"))\n    .toList();\n\n\/\/ \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5c06\u5355\u8bcd\u8f6c\u6362\u4e3a\u5927\u5199\nList<String> upperCaseWords = wordsStartingWithH\n    .stream()\n    .map(String::toUpperCase)\n    .toList();<\/pre>\n
\u7ed3\u8bba<\/strong><\/p>\n
Lambda \u8868\u8fbe\u5f0f\u63d0\u4f9b\u4e86\u5728 Java \u4e2d\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u6709\u529b\u65b9\u5f0f\u3002\u901a\u8fc7\u6620\u5c04\u3001\u8fc7\u6ee4\u548c\u89c4\u7ea6\u64cd\u4f5c\uff0c\u5b83\u4eec\u7b80\u5316\u4e86\u590d\u6742\u6570\u636e\u7684\u5904\u7406\uff0c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7b80\u6d01\u6027\u3002<\/p>\n
\u6587\u4e2d\u5173\u4e8e\u51fd\u6570\u5f0f\u7f16\u7a0b\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\u300a\u5728 Java \u4e2d\u5982\u4f55\u901a\u8fc7 Lambda \u8868\u8fbe\u5f0f\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\uff1f\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":"
\u5728 Java \u4e2d\u5982\u4f55\u901a\u8fc7 Lam...<\/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-202767","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202767","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=202767"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202767\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202767"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202767"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202767"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}