{"id":202699,"date":"2025-05-22T08:19:19","date_gmt":"2025-05-22T00:19:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202699\/"},"modified":"2025-05-22T08:19:19","modified_gmt":"2025-05-22T00:19:19","slug":"%e5%a6%82%e4%bd%95%e5%ba%94%e7%94%a8%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e6%8f%90%e5%8d%87java%e4%bb%a3%e7%a0%81%e6%95%88%e7%8e%87%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202699\/","title":{"rendered":"\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u5347Java\u4ee3\u7801\u6548\u7387\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u5347Java\u4ee3\u7801\u6548\u7387\uff1f<\/h1>\n<p>\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u5347Java\u4ee3\u7801\u6548\u7387\uff1f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729933662671cb15e205b3.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u5347 Java \u4ee3\u7801\u6548\u7387<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \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\u9012\u5f52\u3002\u5b83\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u63d0\u9ad8 Java \u4ee3\u7801\u6548\u7387\uff1a<\/p>\n<p><strong>\u4e0d\u53ef\u53d8\u6027\uff1a<\/strong><\/p>\n<ul>\n<li>\u901a\u8fc7\u4f7f\u7528\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff0c\u907f\u514d\u4e86\u5e76\u53d1\u4fee\u6539\u548c\u6570\u636e\u7ade\u4e89\u95ee\u9898\uff0c\u4ece\u800c\u7b80\u5316\u4e86\u5e76\u53d1\u7f16\u7a0b\u3002<\/li>\n<li>\u7531\u4e8e\u4e0d\u53ef\u53d8\u5bf9\u8c61\u4e0d\u80fd\u88ab\u6539\u53d8\uff0c\u56e0\u6b64\u5b83\u4eec\u53ef\u4ee5\u88ab\u5b89\u5168\u5730\u5171\u4eab\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u5e76\u53d1\u6027\u3002<\/li>\n<\/ul>\n<p><strong>\u7eaf\u51fd\u6570\uff1a<\/strong><\/p>\n<ul>\n<li>\u7eaf\u51fd\u6570\u4e0d\u4f1a\u4ea7\u751f\u526f\u4f5c\u7528\uff08\u4f8b\u5982\uff0c\u4fee\u6539\u5916\u90e8\u72b6\u6001\uff09\uff0c\u5e76\u4e14\u603b\u662f\u8fd4\u56de\u76f8\u540c\u7684\u7ed3\u679c\u3002<\/li>\n<li>\u8fd9\u4f7f\u5f97\u51fd\u6570\u5f0f\u4ee3\u7801\u66f4\u5bb9\u6613\u7406\u89e3\u3001\u6d4b\u8bd5\u548c\u8c03\u8bd5\u3002<\/li>\n<\/ul>\n<p><strong>\u9012\u5f52\uff1a<\/strong><\/p>\n<ul>\n<li>\u9012\u5f52\u5141\u8bb8\u4f7f\u7528\u7b80\u6d01\u800c\u4f18\u96c5\u7684\u8bed\u6cd5\u6765\u89e3\u51b3\u590d\u6742\u7684\u95ee\u9898\u3002<\/li>\n<li>\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\uff0c\u9012\u5f52\u901a\u5e38\u7528\u4e8e\u904d\u5386\u6570\u636e\u7ed3\u6784\u548c\u89e3\u51b3\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a\u67e5\u627e\u6700\u5927\u5143\u7d20<\/strong><\/p>\n<p>\u4ee5\u4e0b\u662f\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u548c FP \u539f\u5219\u67e5\u627e\u6570\u7ec4\u4e2d\u6700\u5927\u5143\u7d20\u7684\u4e00\u4e2a\u7b80\u5355\u793a\u4f8b\uff1a<\/p>\n<pre>import java.util.Arrays;\nimport java.util.List;\nimport java.util.Optional;\n\npublic class FunctionalMaxFinder {\n\n    public static void main(String[] args) {\n        \/\/ \u521b\u5efa\u6574\u578b\u6570\u7ec4\n        List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);\n\n        \/\/ \u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u548c reduce() \u67e5\u627e\u6700\u5927\u5143\u7d20\n        Optional&lt;Integer&gt; max = numbers.stream()\n                                       .reduce((a, b) -&gt; Math.max(a, b));\n\n        \/\/ \u83b7\u53d6\u6700\u5927\u5143\u7d20\u5e76\u6253\u5370\n        max.ifPresent(System.out::println); \/\/ \u8f93\u51fa\uff1a10\n    }\n}<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff1a<\/p>\n<ul>\n<li><code>reduce()<\/code> \u65b9\u6cd5\u4f7f\u7528\u4e00\u4e2a\u4e8c\u5143\u51fd\u6570\uff08\u6b64\u4f8b\u4e2d\u4e3a <code>Math.max()<\/code>) \u5c06\u4e00\u4e2a\u6d41\u4e2d\u7684\u6240\u6709\u5143\u7d20\u7d2f\u79ef\u6210\u4e3a\u5355\u4e2a\u503c\u3002<\/li>\n<li><code>Math.max()<\/code> \u51fd\u6570\u8fd4\u56de\u4e24\u4e2a\u53c2\u6570\u4e2d\u7684\u6700\u5927\u503c\uff0c\u4ece\u800c\u6709\u6548\u5730\u67e5\u627e\u6d41\u4e2d\u7684\u6700\u5927\u5143\u7d20\u3002<\/li>\n<li><code>Optional<\/code> \u7c7b\u7528\u4e8e\u5904\u7406\u53ef\u80fd\u4e0d\u5b58\u5728\u7684\u6700\u5927\u5143\u7d20\u7684\u60c5\u51b5\uff08\u4f8b\u5982\uff0c\u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff09\u3002<\/li>\n<\/ul>\n<p>\u4eca\u5929\u5173\u4e8e\u300a\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u5347Java\u4ee3\u7801\u6548\u7387\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u5e94\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u5347Java\u4ee3&#46;&#46;&#46;<\/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-202699","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202699","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=202699"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202699\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202699"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202699"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202699"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}