{"id":203021,"date":"2025-05-22T08:04:25","date_gmt":"2025-05-22T00:04:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203021\/"},"modified":"2025-05-22T08:04:25","modified_gmt":"2025-05-22T00:04:25","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%9c%a8%e6%95%b0%e6%8d%ae%e5%a4%84%e7%90%86%e4%b8%ad%e5%a4%84%e7%90%86%e5%a4%8d%e6%9d%82%e6%95%b0%e6%8d%ae%e7%9a%84%e7%a7%98%e8%af%80","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203021\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u4e2d\u5904\u7406\u590d\u6742\u6570\u636e\u7684\u79d8\u8bc0"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u4e2d\u5904\u7406\u590d\u6742\u6570\u636e\u7684\u79d8\u8bc0<\/h1>\n<p>\u5bf9\u4e8e\u4e00\u4e2a\u6587\u7ae0\u5f00\u53d1\u8005\u6765\u8bf4\uff0c\u7262\u56fa\u624e\u5b9e\u7684\u57fa\u7840\u662f\u5341\u5206\u91cd\u8981\u7684\uff0c\u5c31\u6765\u5e26\u5927\u5bb6\u4e00\u70b9\u70b9\u7684\u638c\u63e1\u57fa\u7840\u77e5\u8bc6\u70b9\u3002\u4eca\u5929\u672c\u7bc7\u6587\u7ae0\u5e26\u5927\u5bb6\u4e86\u89e3\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u4e2d\u5904\u7406\u590d\u6742\u6570\u636e\u7684\u79d8\u8bc0\u300b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e86\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u5feb\u70b9\u6536\u85cf\u8d77\u6765\u5427\uff0c\u5426\u5219\u9700\u8981\u65f6\u5c31\u627e\u4e0d\u5230\u4e86\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241027\/1730022086671e0ac62fd50.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\uff1a\u5904\u7406\u590d\u6742\u6570\u636e\u7684\u79d8\u8bc0<\/strong><\/p>\n<p><strong>\u5f15\u8a00<\/strong><\/p>\n<p>\u968f\u7740\u6570\u636e\u91cf\u7684\u6025\u5267\u589e\u957f\uff0c\u9700\u8981\u4e00\u79cd\u6709\u6548\u4e14\u53ef\u6269\u5c55\u7684\u65b9\u6cd5\u6765\u5904\u7406\u590d\u6742\u6570\u636e\u3002Java \u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u4f18\u96c5\u4e14\u9ad8\u6548\u5730\u89e3\u51b3\u6b64\u6311\u6218\u3002<\/p>\n<p><strong>\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u57fa\u672c\u6982\u5ff5<\/strong><\/p>\n<p>FP \u5f3a\u8c03\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u3001\u7eaf\u51fd\u6570\u548c\u9ad8\u9636\u51fd\u6570\u3002<\/p>\n<ul>\n<li><strong>\u4e0d\u53ef\u53d8\u6570\u636e\uff1a<\/strong> \u6570\u636e\u4e00\u65e6\u521b\u5efa\uff0c\u5c31\u4e0d\u80fd\u518d\u4fee\u6539\uff0c\u8fd9\u63d0\u9ad8\u4e86\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u5e76\u53d1\u6027\u3002<\/li>\n<li><strong>\u7eaf\u51fd\u6570\uff1a<\/strong> \u51fd\u6570\u4e0d\u4fee\u6539\u4efb\u4f55\u72b6\u6001\u6216\u4f9d\u8d56\u4e8e\u5916\u90e8\u6570\u636e\uff0c\u8fd9\u4f7f\u5b83\u4eec\u6613\u4e8e\u63a8\u7406\u548c\u6d4b\u8bd5\u3002<\/li>\n<li><strong>\u9ad8\u9636\u51fd\u6570\uff1a<\/strong> \u51fd\u6570\u53ef\u4ee5\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u5176\u4ed6\u51fd\u6570\u6216\u8fd4\u56de\u51fd\u6570\uff0c\u63d0\u4f9b\u4ee3\u7801\u91cd\u7528\u548c\u62bd\u8c61\u3002<\/li>\n<\/ul>\n<p><strong>\u6848\u4f8b\uff1a\u6570\u636e\u8f6c\u6362<\/strong><\/p>\n<p>\u8003\u8651\u4ee5\u4e0b\u4efb\u52a1\uff1a\u5c06\u5b57\u7b26\u4e32\u5217\u8868\u8f6c\u6362\u4e3a\u6574\u6570\u5217\u8868\u3002<\/p>\n<p><strong>\u4f20\u7edf\u65b9\u6cd5\uff1a<\/strong><\/p>\n<pre>List&lt;String&gt; strings = List.of(\"1\", \"2\", \"3\");\nList&lt;Integer&gt; integers = new ArrayList&lt;&gt;();\nfor (String s : strings) {\n    integers.add(Integer.parseInt(s));\n}<\/pre>\n<p><strong>FP \u65b9\u6cd5\uff1a<\/strong><\/p>\n<pre>List&lt;String&gt; strings = List.of(\"1\", \"2\", \"3\");\nList&lt;Integer&gt; integers = strings.stream()\n    .map(Integer::parseInt)\n    .collect(Collectors.toList());<\/pre>\n<p>FP \u65b9\u6cd5\u4f7f\u7528 <code>stream()<\/code> \u521b\u5efa\u4e00\u4e2a\u5143\u7d20\u6d41\uff0c\u7136\u540e\u4f7f\u7528 <code>map()<\/code> \u51fd\u6570\u5c06\u6bcf\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570\uff0c\u6700\u540e\u4f7f\u7528 <code>collect()<\/code> \u5c06\u6240\u6709\u5143\u7d20\u6536\u96c6\u5230\u5217\u8868\u4e2d\u3002<\/p>\n<p><strong>FP \u65b9\u6cd5\u7684\u4f18\u52bf<\/strong><\/p>\n<ul>\n<li><strong>\u7b80\u6d01:<\/strong> FP \u4ee3\u7801\u66f4\u7b80\u6d01\uff0c\u56e0\u4e3a\u4e0d\u9700\u8981\u663e\u5f0f\u5faa\u73af\u6216\u53ef\u53d8\u72b6\u6001\u3002<\/li>\n<li><strong>\u53ef\u8bfb\u6027:<\/strong> \u9ad8\u9636\u51fd\u6570\u548c lambda \u8868\u8fbe\u5f0f\u4f7f\u4ee3\u7801\u66f4\u5177\u53ef\u8bfb\u6027\u3002<\/li>\n<li><strong>\u53ef\u6269\u5c55\u6027:<\/strong> FP \u4ee3\u7801\u5e76\u884c\u5316\u5f97\u5f88\u597d\uff0c\u8fd9\u5bf9\u4e8e\u5904\u7406\u5927\u6570\u636e\u96c6\u975e\u5e38\u91cd\u8981\u3002<\/li>\n<li><strong>\u53ef\u6d4b\u8bd5\u6027:<\/strong> \u7eaf\u51fd\u6570\u6613\u4e8e\u63a8\u7406\u548c\u6d4b\u8bd5\uff0c\u63d0\u9ad8\u4e86\u4ee3\u7801\u53ef\u9760\u6027\u3002<\/li>\n<\/ul>\n<p><strong>\u5176\u4ed6\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<ul>\n<li><strong>\u8fc7\u6ee4:<\/strong> \u4ece\u5217\u8868\u4e2d\u79fb\u9664\u5143\u7d20\uff08\u4f8b\u5982\uff0c<code>filter(s -&gt; !s.isBlank())<\/code>\uff09<\/li>\n<li><strong>\u805a\u5408:<\/strong> \u7ed3\u5408\u591a\u4e2a\u5143\u7d20\u7684\u5c5e\u6027\uff08\u4f8b\u5982\uff0c<code>reduce(Integer::sum)<\/code>\uff09<\/li>\n<li><strong>\u6392\u5e8f:<\/strong> \u6839\u636e\u5143\u7d20\u7684\u5c5e\u6027\u5bf9\u5217\u8868\u8fdb\u884c\u6392\u5e8f\uff08\u4f8b\u5982\uff0c<code>sorted(Comparator.comparing(String::length))<\/code>\uff09<\/li>\n<li><strong>\u5e76\u884c\u5904\u7406:<\/strong> \u4f7f\u7528 <code>parallelStream()<\/code> \u5e76\u884c\u5904\u7406\u6570\u636e\u3002<\/li>\n<\/ul>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u53ef\u7528\u4e8e\u6709\u6548\u4e14\u9ad8\u6548\u5730\u5904\u7406\u590d\u6742\u6570\u636e\u3002\u901a\u8fc7\u4e86\u89e3\u5176\u57fa\u672c\u6982\u5ff5\u548c\u4f7f\u7528\u5b9e\u9645\u6848\u4f8b\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u5229\u7528 FP \u7684\u4f18\u52bf\u663e\u8457\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3001\u7b80\u6d01\u6027\u3001\u53ef\u6269\u5c55\u6027\u548c\u53ef\u6d4b\u8bd5\u6027\u3002<\/p>\n<p>\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u4e2d\u5904\u7406\u590d\u6742\u6570\u636e\u7684\u79d8\u8bc0\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":"<p>Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u4e2d\u5904&#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-203021","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203021","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=203021"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203021\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203021"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203021"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203021"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}