{"id":202954,"date":"2025-05-22T09:58:46","date_gmt":"2025-05-22T01:58:46","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202954\/"},"modified":"2025-05-22T09:58:46","modified_gmt":"2025-05-22T01:58:46","slug":"%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%ae%9e%e7%8e%b0java%e4%bb%a3%e7%a0%81%e7%9a%84%e9%ab%98%e9%98%b6%e6%8a%bd%e8%b1%a1%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202954\/","title":{"rendered":"\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u5b9e\u73b0Java\u4ee3\u7801\u7684\u9ad8\u9636\u62bd\u8c61\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u5b9e\u73b0Java\u4ee3\u7801\u7684\u9ad8\u9636\u62bd\u8c61\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\u300a\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u5b9e\u73b0Java\u4ee3\u7801\u7684\u9ad8\u9636\u62bd\u8c61\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

\u5728 Java \u4e2d\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \u63d0\u4f9b\u4e86\u9ad8\u9636\u62bd\u8c61\uff0c\u901a\u8fc7 lambda \u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u63a5\u53e3\u5b9e\u73b0\uff1alambda \u8868\u8fbe\u5f0f\uff1a\u4ee3\u7801\u5757\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u5176\u4ed6\u51fd\u6570\u3002\u51fd\u6570\u5f0f\u63a5\u53e3\uff1a\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\uff0c\u4e3a lambda \u8868\u8fbe\u5f0f\u63d0\u4f9b\u76ee\u6807\u7c7b\u578b\u3002\u5b9e\u6218\u6848\u4f8b\uff1a\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u7b80\u5316\u5217\u8868\u5143\u7d20\u8f6c\u6362\u8fc7\u7a0b\uff0c\u63d0\u9ad8\u4ee3\u7801\u7b80\u6d01\u6027\u3001\u6a21\u5757\u5316\u548c\u53ef\u91cd\u7528\u6027\u3002<\/p>\n

<\/p>\n

\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u5b9e\u73b0 Java \u4ee3\u7801\u7684\u9ad8\u9636\u62bd\u8c61<\/strong><\/p>\n

\u5728 Java \u4e2d\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \u8303\u5f0f\u63d0\u4f9b\u4e86\u4e00\u79cd\u9ad8\u9636\u62bd\u8c61\u7684\u65b9\u6cd5\uff0c\u8ba9\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3001\u6a21\u5757\u5316\u548c\u53ef\u91cd\u7528\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5229\u7528 Java lambda \u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u63a5\u53e3\u5b9e\u73b0\u9ad8\u9636\u62bd\u8c61\u7684\u6280\u672f\u3002<\/p>\n

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

lambda \u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u533f\u540d\u51fd\u6570\uff0c\u5141\u8bb8\u5c06\u4ee3\u7801\u5757\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u5176\u4ed6\u51fd\u6570\u3002\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

(\u53c2\u6570\u5217\u8868) -> \u51fd\u6570\u4f53<\/pre>\n
\u4f8b\u5982\uff0c\u4ee5\u4e0b lambda \u8868\u8fbe\u5f0f\u8ba1\u7b97\u4e24\u4e2a\u6570\u5b57\u7684\u548c\uff1a<\/p>\n
(a, b) -> a + b<\/pre>\n
\u51fd\u6570\u5f0f\u63a5\u53e3<\/strong><\/p>\n
\u51fd\u6570\u5f0f\u63a5\u53e3\u662f\u4ec5\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\u3002\u5b83\u4eec\u4e3a lambda \u8868\u8fbe\u5f0f\u63d0\u4f9b\u4e86\u4e00\u4e2a\u76ee\u6807\u7c7b\u578b\uff0c\u5141\u8bb8\u5c06 lambda \u8868\u8fbe\u5f0f\u8d4b\u503c\u7ed9\u51fd\u6570\u5f0f\u63a5\u53e3\u53d8\u91cf\u3002<\/p>\n
\u4f8b\u5982\uff0c\u4ee5\u4e0b Function<\/code> \u51fd\u6570\u5f0f\u63a5\u53e3\u8868\u793a\u4e00\u4e2a\u63a5\u6536\u4e00\u4e2a\u53c2\u6570\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\u7684\u51fd\u6570\uff1a<\/p>\n
@FunctionalInterface\ninterface Function<T, R> {\n    R apply(T t);\n}<\/pre>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u8003\u8651\u4e00\u4e2a\u573a\u666f\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u5e94\u7528\u4e00\u4e2a\u51fd\u6570\u3002\u4f7f\u7528\u4f20\u7edf\u7684\u65b9\u6cd5\uff0c\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u663e\u5f0f\u7684\u5faa\u73af\u548c\u4e00\u4e2a\u5c40\u90e8\u51fd\u6570\uff1a<\/p>\n
List<Integer> numbers = List.of(1, 2, 3, 4, 5);\n\nList<Integer> squaredNumbers = new ArrayList<>();\nfor (int number : numbers) {\n    squaredNumbers.add(number * number);\n}<\/pre>\n
\u4f7f\u7528 FP\uff0c\u6211\u4eec\u53ef\u4ee5\u7528 lambda \u8868\u8fbe\u5f0f\u7b80\u5316\u6b64\u8fc7\u7a0b\uff1a<\/p>\n
List<Integer> numbers = List.of(1, 2, 3, 4, 5);\n\nFunction<Integer, Integer> squareFunction = x -> x * x;\n\nList<Integer> squaredNumbers = numbers.stream()\n    .map(squareFunction)\n    .toList();<\/pre>\n
\u5728\u6b64\u793a\u4f8b\u4e2d\uff1a<\/p>\n
    \n
  • map()<\/code> \u65b9\u6cd5\u63a5\u53d7 lambda \u8868\u8fbe\u5f0f squareFunction<\/code>\uff0c\u8be5\u8868\u8fbe\u5f0f\u5c06\u6bcf\u4e2a\u5143\u7d20\u5e73\u65b9\u3002<\/li>\n
  • \u6d41\u5f0f API \u63d0\u4f9b\u4e86\u4e00\u4e2a\u7b80\u6d01\u7684\u65b9\u5f0f\u6765\u5904\u7406\u548c\u8f6c\u6362\u5217\u8868\u4e2d\u7684\u5143\u7d20\u3002<\/li>\n<\/ul>\n
    \u901a\u8fc7\u4f7f\u7528 FP\uff0c\u6211\u4eec\u83b7\u5f97\u4e86\u66f4\u7b80\u6d01\u548c\u53ef\u8bfb\u7684\u4ee3\u7801\uff0c\u51cf\u5c11\u4e86\u6837\u677f\u4ee3\u7801\u5e76\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u91cd\u7528\u6027\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u5b9e\u73b0Java\u4ee3...<\/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-202954","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202954","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=202954"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202954\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202954"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202954"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202954"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}