{"id":202661,"date":"2025-05-22T09:53:24","date_gmt":"2025-05-22T01:53:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202661\/"},"modified":"2025-05-22T09:53:24","modified_gmt":"2025-05-22T01:53:24","slug":"%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%9c%a8java%e7%ae%80%e6%b4%81%e7%bc%96%e7%a0%81%e4%b8%ad%e7%9a%84%e5%85%b7%e4%bd%93%e5%ae%9e%e7%8e%b0%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202661\/","title":{"rendered":"\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728Java\u7b80\u6d01\u7f16\u7801\u4e2d\u7684\u5177\u4f53\u5b9e\u73b0\uff1f"},"content":{"rendered":"

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

\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728Java\u7b80\u6d01\u7f16\u7801\u4e2d\u7684\u5177\u4f53\u5b9e\u73b0\uff1f<\/h1>\n

\u77e5\u8bc6\u70b9\u638c\u63e1\u4e86\uff0c\u8fd8\u9700\u8981\u4e0d\u65ad\u7ec3\u4e60\u624d\u80fd\u719f\u7ec3\u8fd0\u7528\u3002\u4e0b\u9762\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u4e2a\u6587\u7ae0\u5f00\u53d1\u5b9e\u6218\uff0c\u624b\u628a\u624b\u6559\u5927\u5bb6\u5b66\u4e60\u300a\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728Java\u7b80\u6d01\u7f16\u7801\u4e2d\u7684\u5177\u4f53\u5b9e\u73b0\uff1f\u300b\uff0c\u5728\u5b9e\u73b0\u529f\u80fd\u7684\u8fc7\u7a0b\u4e2d\u4e5f\u5e26\u5927\u5bb6\u91cd\u65b0\u6e29\u4e60\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6e29\u6545\u800c\u77e5\u65b0\uff0c\u56de\u5934\u770b\u770b\u8bf4\u4e0d\u5b9a\u53c8\u6709\u4e0d\u4e00\u6837\u7684\u611f\u609f\uff01<\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u901a\u8fc7\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u548c Stream API \u5728 Java \u4e2d\u5b9e\u73b0\uff0c\u53ef\u5c06\u6bcf\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u5927\u5199\uff0c\u8fc7\u6ee4\u957f\u5ea6\u5927\u4e8e 5 \u7684\u5b57\u7b26\u4e32\uff0c\u5e76\u5c06\u5269\u4f59\u5b57\u7b26\u4e32\u8fde\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u4ece\u800c\u7b80\u5316\u4e86\u5bf9\u5b57\u7b26\u4e32\u5217\u8868\u7684\u64cd\u4f5c\u3002\u8fd9\u63d0\u4f9b\u4e86\u53ef\u8bfb\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u548c\u6027\u80fd\u7b49\u4f18\u52bf\u3002<\/p>\n

<\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728 Java \u7b80\u6d01\u7f16\u7801\u4e2d\u7684\u5177\u4f53\u5b9e\u73b0<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u5f0f\uff0c\u5b83\u5f3a\u8c03\u4e0d\u53ef\u53d8\u6027\u548c\u51fd\u6570\u7684\u8fd0\u7528\u3002\u5728 Java \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u548c Stream API \u6765\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\u3002<\/p>\n

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

Lambda \u8868\u8fbe\u5f0f\u5141\u8bb8\u6211\u4eec\u4ee5\u7b80\u6d01\u7684\u65b9\u5f0f\u5b9a\u4e49\u533f\u540d\u5b57\u7b26\u4e32\u3002\u5b83\u5177\u6709\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/p>\n

(parameter list) -> expression<\/pre>\n
\u4f8b\u5982\uff1a<\/p>\n
\/\/ \u5b9a\u4e49\u5c06\u6570\u5b57\u5e73\u65b9\u589e\u957f\u7684 lambda \u8868\u8fbe\u5f0f\nUnaryOperator<Integer> square = x -> x * x;<\/pre>\n
Stream API<\/strong><\/p>\n
Stream API \u63d0\u4f9b\u4e86\u4e00\u7ec4\u64cd\u4f5c\uff0c\u53ef\u7528\u4e8e\u5bf9\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u5e76\u884c\u548c\u987a\u5e8f\u5904\u7406\u3002\u5b83\u5177\u6709\u4ee5\u4e0b\u6838\u5fc3\u65b9\u6cd5\uff1a<\/p>\n
    \n
  • map()<\/code>: \u5c06\u6d41\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u8f6c\u6362\u4e3a\u65b0\u503c\u3002<\/li>\n
  • filter()<\/code>: \u6839\u636e\u7ed9\u5b9a\u6761\u4ef6\u8fc7\u6ee4\u6d41\u4e2d\u7684\u5143\u7d20\u3002<\/li>\n
  • reduce()<\/code>: \u5c06\u6d41\u4e2d\u7684\u5143\u7d20\u805a\u5408\u4e3a\u5355\u4e2a\u503c\u3002<\/li>\n<\/ul>\n
    \u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
    \u6211\u4eec\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u5bf9\u4e00\u4e2a\u5b57\u7b26\u4e32\u5217\u8868\u8fdb\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n
      \n
    • \u5c06\u6bcf\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u5927\u5199\u3002<\/li>\n
    • \u8fc7\u6ee4\u957f\u5ea6\u5927\u4e8e 5 \u7684\u5b57\u7b26\u4e32\u3002<\/li>\n
    • \u5c06\u5269\u4f59\u7684\u5b57\u7b26\u4e32\u8fde\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n
      List<String> strings = List.of(\"hello\", \"world\", \"java\", \"programming\");\n\n\/\/ \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u548c Stream API \u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5904\u7406\nString concatenatedString = strings.stream()\n        .map(String::toUpperCase)  \/\/ \u5c06\u6bcf\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u5927\u5199\n        .filter(string -> string.length() > 5)  \/\/ \u8fc7\u6ee4\u957f\u5ea6\u5927\u4e8e 5 \u7684\u5b57\u7b26\u4e32\n        .reduce(\"\", (result, string) -> result + \" \" + string);  \/\/ \u5c06\u5269\u4f59\u5b57\u7b26\u4e32\u8fde\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\n\nSystem.out.println(concatenatedString);  \/\/ \u8f93\u51fa\uff1aHELLO WORLD PROGRAMMING<\/pre>\n
      \u4f18\u52bf<\/strong><\/p>\n
      \u51fd\u6570\u5f0f\u7f16\u7a0b\u5728 Java \u4e2d\u7684\u7b80\u6d01\u7f16\u7801\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u4f18\u52bf\uff1a<\/p>\n
        \n
      • \u53ef\u8bfb\u6027\uff1a\u4ee3\u7801\u66f4\u6613\u4e8e\u9605\u8bfb\u548c\u7406\u89e3\u3002<\/li>\n
      • \u53ef\u7ef4\u62a4\u6027\uff1a\u4ee3\u7801\u66f4\u5bb9\u6613\u7ef4\u62a4\u548c\u66f4\u65b0\u3002<\/li>\n
      • \u6027\u80fd\uff1aStream API \u53ef\u4ee5\u901a\u8fc7\u5e76\u884c\u5904\u7406\u663e\u8457\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<\/ul>\n
        \u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300a\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728Java\u7b80\u6d01\u7f16\u7801\u4e2d\u7684\u5177\u4f53\u5b9e\u73b0\uff1f\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03\u6587\u7ae0\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u51fd\u6570\u5f0f\u7f16\u7a0b\u5728Java\u7b80\u6d01\u7f16\u7801\u4e2d\u7684...<\/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-202661","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202661","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=202661"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202661\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202661"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202661"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}