{"id":202966,"date":"2025-05-22T08:36:49","date_gmt":"2025-05-22T00:36:49","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202966\/"},"modified":"2025-05-22T08:36:49","modified_gmt":"2025-05-22T00:36:49","slug":"%e5%a6%82%e4%bd%95%e5%b0%86-java-lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%e4%b8%8e-stream-api-%e7%bb%93%e5%90%88%e4%bd%bf%e7%94%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202966\/","title":{"rendered":"\u5982\u4f55\u5c06 Java lambda \u8868\u8fbe\u5f0f\u4e0e Stream API \u7ed3\u5408\u4f7f\u7528\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u5c06 Java lambda \u8868\u8fbe\u5f0f\u4e0e Stream API \u7ed3\u5408\u4f7f\u7528\uff1f<\/h1>\n

\u6587\u7ae0<\/span>\u4e0d\u77e5\u9053\u5927\u5bb6\u662f\u5426\u719f\u6089\uff1f\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u300a\u5982\u4f55\u5c06 Java lambda \u8868\u8fbe\u5f0f\u4e0e Stream API \u7ed3\u5408\u4f7f\u7528\uff1f\u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u5728\u770b\u5b8c\u672c\u7bc7\u6587\u7ae0\u540e\uff0c\u6709\u66f4\u597d\u7684\u5efa\u8bae\u6216\u8005\u53d1\u73b0\u54ea\u91cc\u6709\u95ee\u9898\uff0c\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u79ef\u6781\u8bc4\u8bba\u6307\u51fa\uff0c\u8c22\u8c22\uff01\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u52a0\u6cb9\u8fdb\u6b65\uff01<\/p>\n

\u7ed3\u5408 Java Stream API \u548c lambda \u8868\u8fbe\u5f0f\u53ef\u7b80\u5316\u6570\u636e\u5904\u7406\uff0c\u63d0\u5347\u4ee3\u7801\u6548\u7387\uff1a\u521b\u5efa Stream \u5bf9\u8c61\u3002\u4f7f\u7528\u4e2d\u95f4\u64cd\u4f5c\u94fe\u5904\u7406 Stream \u4e2d\u7684\u5143\u7d20\uff0c\u5229\u7528 lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\u3002\u4f7f\u7528\u7ec8\u6b62\u64cd\u4f5c\u5b8c\u6210\u5bf9 Stream \u7684\u5904\u7406\u5e76\u83b7\u53d6\u7ed3\u679c\u3002<\/p>\n

<\/p>\n

\u5982\u4f55\u5c06 Java lambda \u8868\u8fbe\u5f0f\u4e0e Stream API \u7ed3\u5408\u4f7f\u7528<\/strong><\/p>\n

Java Stream API \u548c lambda \u8868\u8fbe\u5f0f\u662f\u63d0\u9ad8 Java \u7f16\u7a0b\u6548\u7387\u7684\u5f3a\u5927\u5de5\u5177\u3002\u7ed3\u5408\u4f7f\u7528\u65f6\uff0c\u5b83\u4eec\u53ef\u4ee5\u7b80\u5316\u6570\u636e\u5904\u7406\u4efb\u52a1\uff0c\u5e76\u4f7f\u4ee3\u7801\u66f4\u5177\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n

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

lambda \u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u65e0\u540d\u51fd\u6570\uff0c\u5b83\u4f7f\u7528\u7bad\u5934 (-><\/code>) \u8bed\u6cd5\u5c06\u53c2\u6570\u6620\u5c04\u5230\u8fd4\u56de\u8868\u8fbe\u5f0f\u3002\u5b83\u5141\u8bb8\u7b80\u5316\u533f\u540d\u5185\u90e8\u7c7b\u7684\u521b\u5efa\u3002<\/p>\n

Stream API<\/strong><\/p>\n

Stream API \u662f\u4e00\u4e2a\u6570\u636e\u5904\u7406\u6846\u67b6\uff0c\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u4e2d\u95f4\u64cd\u4f5c\uff08\u4f8b\u5982\u8fc7\u6ee4\u3001\u6620\u5c04\u3001\u6392\u5e8f\uff09\u548c\u7ec8\u6b62\u64cd\u4f5c\uff08\u4f8b\u5982\u6536\u96c6\u3001\u7ea6\u7b80\uff09\u3002\u5b83\u4f7f\u7528\u60f0\u6027\u6c42\u503c\uff0c\u8fd9\u610f\u5473\u7740\u64cd\u4f5c\u4ec5\u5728\u9700\u8981\u65f6\u624d\u6267\u884c\u3002\u8fd9\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u6548\u7387\uff0c\u5c24\u5176\u662f\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u65f6\u3002<\/p>\n

\u7ed3\u5408\u4f7f\u7528<\/strong><\/p>\n

\u5c06 lambda \u8868\u8fbe\u5f0f\u4e0e Stream API \u7ed3\u5408\u4f7f\u7528\u6d89\u53ca\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n

    \n
  1. \u521b\u5efa\u4e00\u4e2a Stream \u5bf9\u8c61\uff0c\u901a\u5e38\u901a\u8fc7\u4f7f\u7528 Collection.stream()<\/code> \u6216 Arrays.stream()<\/code> \u65b9\u6cd5\u3002<\/li>\n
  2. \u4f7f\u7528\u4e2d\u95f4\u64cd\u4f5c\u94fe\u6765\u5904\u7406 Stream \u4e2d\u7684\u5143\u7d20\u3002lambda \u8868\u8fbe\u5f0f\u53ef\u7528\u4f5c\u8fd9\u4e9b\u64cd\u4f5c\u7684\u53c2\u6570\u3002<\/li>\n
  3. \u4f7f\u7528\u7ec8\u6b62\u64cd\u4f5c\u6765\u5b8c\u6210\u5bf9 Stream \u7684\u5904\u7406\u5e76\u83b7\u53d6\u7ed3\u679c\u3002<\/li>\n<\/ol>\n

    \u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n

    \u8ba9\u6211\u4eec\u8003\u8651\u4ee5\u4e0b\u5b9e\u6218\u6848\u4f8b\uff1a\u7ed9\u5b9a\u4e00\u4e2a\u5305\u542b\u6574\u6570\u7684\u5217\u8868\uff0c\u6211\u4eec\u9700\u8981\u83b7\u53d6\u6240\u6709\u5076\u6570\u5e76\u6c42\u548c\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u548c Stream API \u5982\u4e0b\u5b8c\u6210\uff1a<\/p>\n

    import java.util.Arrays;\nimport java.util.List;\nimport java.util.stream.Collectors;\n\npublic class LambdaStreamExample {\n\n    public static void main(String[] args) {\n        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\n\n        \/\/ \u7b5b\u9009\u5076\u6570\n        List<Integer> evenNumbers = numbers.stream()\n                .filter(number -> number % 2 == 0)\n                .collect(Collectors.toList());\n\n        \/\/ \u6c42\u548c\n        int sum = evenNumbers.stream()\n                .reduce(0, (accumulator, element) -> accumulator + element);\n\n        System.out.println(\"\u5076\u6570\u7ec4\u5408\uff1a\" + evenNumbers);\n        System.out.println(\"\u5076\u6570\u548c\uff1a\" + sum);\n    }\n}<\/pre>\n
    \u5728\u8be5\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u4f7f\u7528 filter()<\/code> \u4e2d\u95f4\u64cd\u4f5c\u548c\u4e00\u4e2a lambda \u8868\u8fbe\u5f0f\u6765\u7b5b\u9009\u51fa\u5076\u6570\u3002\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528 collect()<\/code> \u7ec8\u6b62\u64cd\u4f5c\u5c06\u7b5b\u9009\u540e\u7684 Stream \u8f6c\u6362\u4e3a\u4e00\u4e2a\u65b0\u7684\u5217\u8868\u3002\u6700\u540e\uff0c\u6211\u4eec\u4f7f\u7528 reduce()<\/code> \u7ec8\u6b62\u64cd\u4f5c\u548c\u53e6\u4e00\u4e2a lambda \u8868\u8fbe\u5f0f\u6765\u8ba1\u7b97\u5076\u6570\u7684\u548c\u3002<\/p>\n
    \u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300a\u5982\u4f55\u5c06 Java lambda \u8868\u8fbe\u5f0f\u4e0e Stream API \u7ed3\u5408\u4f7f\u7528\uff1f\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":"
    \u5982\u4f55\u5c06 Java lambda ...<\/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-202966","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202966","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=202966"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202966\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202966"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202966"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202966"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}