{"id":202592,"date":"2025-05-22T08:36:46","date_gmt":"2025-05-22T00:36:46","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202592\/"},"modified":"2025-05-22T08:36:46","modified_gmt":"2025-05-22T00:36:46","slug":"lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%e5%92%8c%e9%ab%98%e9%98%b6%e5%87%bd%e6%95%b0%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\/202592\/","title":{"rendered":"lambda \u8868\u8fbe\u5f0f\u548c\u9ad8\u9636\u51fd\u6570\u5728 Java \u4e2d\u7684\u5173\u7cfb"},"content":{"rendered":"

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

lambda \u8868\u8fbe\u5f0f\u548c\u9ad8\u9636\u51fd\u6570\u5728 Java \u4e2d\u7684\u5173\u7cfb<\/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\u548c\u9ad8\u9636\u51fd\u6570\u5728 Java \u4e2d\u7684\u5173\u7cfb\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\u662f\u5141\u8bb8\u5c06\u4ee3\u7801\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u51fd\u6570\u7684\u533f\u540d\u51fd\u6570\uff0c\u901a\u5e38\u7528\u4e8e\u5b9e\u73b0\u51fd\u6570\u5f0f\u63a5\u53e3\u3002\u9ad8\u9636\u51fd\u6570\u53ef\u63a5\u53d7\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6216\u8fd4\u56de\u51fd\u6570\u4f5c\u4e3a\u7ed3\u679c\uff0c\u4f7f\u60a8\u53ef\u4ee5\u5c06\u51fd\u6570\u89c6\u4e3a\u4e00\u7b49\u516c\u6c11\u3002lambda \u8868\u8fbe\u5f0f\u901a\u5e38\u4e0e\u9ad8\u9636\u51fd\u6570\u4e00\u8d77\u4f7f\u7528\uff0c\u53ef\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u9ad8\u9636\u51fd\u6570\u6216\u5d4c\u5957\u5728\u5176\u4ed6 lambda \u8868\u8fbe\u5f0f\u4e2d\u3002<\/p>\n

<\/p>\n

lambda \u8868\u8fbe\u5f0f\u548c\u9ad8\u9636\u51fd\u6570\u5728 Java \u4e2d\u7684\u5173\u7cfb<\/strong><\/p>\n

\u4ec0\u4e48\u662f lambda \u8868\u8fbe\u5f0f\uff1f<\/strong><\/p>\n

lambda \u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u533f\u540d\u51fd\u6570\uff0c\u5b83\u5141\u8bb8\u60a8\u5c06\u4e00\u5757\u4ee3\u7801\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u5176\u4ed6\u51fd\u6570\u3002\u5b83\u4eec\u901a\u5e38\u7528\u4e8e\u5b9e\u73b0\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u5373\u4ec5\u58f0\u660e\u4e86\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\u3002<\/p>\n

lambda \u8868\u8fbe\u5f0f\u7684\u8bed\u6cd5\u4e3a\uff1a<\/p>\n

(parameters) -> expression<\/pre>\n
\u4f8b\u5982\uff1a<\/p>\n
Predicate<String> isPalindrome = (String s) -> s.equals(new StringBuilder(s).reverse().toString());<\/pre>\n
\u4e0a\u9762\u662f\u4e00\u4e2a\u540d\u4e3a isPalindrome<\/code> \u7684 lambda \u8868\u8fbe\u5f0f\uff0c\u5b83\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u662f\u56de\u6587\u3002<\/p>\n
\u4ec0\u4e48\u662f\u9ad8\u9636\u51fd\u6570\uff1f<\/strong><\/p>\n
\u9ad8\u9636\u51fd\u6570\u662f\u63a5\u53d7\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6216\u8fd4\u56de\u51fd\u6570\u4f5c\u4e3a\u7ed3\u679c\u7684\u51fd\u6570\u3002\u5b83\u4eec\u5141\u8bb8\u60a8\u5c06\u51fd\u6570\u89c6\u4e3a\u4e00\u7b49\u516c\u6c11\uff0c\u8fd9\u610f\u5473\u7740\u60a8\u53ef\u4ee5\u5bf9\u51fd\u6570\u6267\u884c\u64cd\u4f5c\uff0c\u5c31\u50cf\u5bf9\u5176\u4ed6\u7c7b\u578b\u7684\u6570\u636e\u4e00\u6837\u3002<\/p>\n
lambda \u8868\u8fbe\u5f0f\u548c\u9ad8\u9636\u51fd\u6570\u7684\u5173\u7cfb<\/strong><\/p>\n
lambda \u8868\u8fbe\u5f0f\u901a\u5e38\u4e0e\u9ad8\u9636\u51fd\u6570\u4e00\u8d77\u4f7f\u7528\u3002\u60a8\u53ef\u4ee5\u5c06 lambda \u8868\u8fbe\u5f0f\u4f20\u9012\u7ed9\u9ad8\u9636\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u5c06\u9ad8\u9636\u51fd\u6570\u8fd4\u56de\u7684 lambda \u8868\u8fbe\u5f0f\u5206\u914d\u7ed9\u53d8\u91cf\u6216\u5728\u5176\u4ed6lambda\u8868\u8fbe\u5f0f\u4e2d\u5d4c\u5957\u4f7f\u7528 lambda\u8868\u8fbe\u5f0f\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u548c\u9ad8\u9636\u51fd\u6570\u5bf9\u96c6\u5408\u8fdb\u884c\u8fc7\u6ee4\u7684\u793a\u4f8b\uff1a<\/p>\n
List<Integer> numbers = List.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\n\n\/\/ \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u8fc7\u6ee4\u5076\u6570\nList<Integer> evenNumbers = numbers.stream()\n        .filter((Integer n) -> n % 2 == 0)\n        .toList();\n\n\/\/ \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5bf9\u7ed3\u679c\u53d6\u5e73\u65b9\nList<Integer> squares = evenNumbers.stream()\n        .map((Integer n) -> n * n)\n        .toList();\n\nSystem.out.println(squares); \/\/ \u8f93\u51fa\uff1a[4, 16, 36, 64, 100]<\/pre>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5c06filter<\/code> \u548c map<\/code> \u9ad8\u9636\u51fd\u6570\u4e0e lambda \u8868\u8fbe\u5f0f\u7ed3\u5408\u4f7f\u7528\uff0c\u5206\u522b\u5bf9\u96c6\u5408\u8fdb\u884c\u5076\u6570\u8fc7\u6ee4\u548c\u53d6\u5e73\u65b9\u3002<\/p>\n
\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300alambda \u8868\u8fbe\u5f0f\u548c\u9ad8\u9636\u51fd\u6570\u5728 Java \u4e2d\u7684\u5173\u7cfb\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u516c\u4f17\u53f7\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
lambda \u8868\u8fbe\u5f0f\u548c\u9ad8\u9636\u51fd\u6570\u5728...<\/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-202592","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202592","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=202592"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202592\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}