{"id":202655,"date":"2025-05-22T09:53:05","date_gmt":"2025-05-22T01:53:05","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202655\/"},"modified":"2025-05-22T09:53:05","modified_gmt":"2025-05-22T01:53:05","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%e5%92%8c%e5%88%86%e6%9e%90%e4%b8%ad%e7%9a%84%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202655\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u4e2d\u7684\u5e94\u7528"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u4e2d\u7684\u5e94\u7528<\/h1>\n<p>\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u8981\u52aa\u529b\uff0c\u4f46\u662f\u4e0d\u8981\u6025\uff01\u4eca\u5929\u7684\u8fd9\u7bc7\u6587\u7ae0<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u4e2d\u7684\u5e94\u7528\u300b<\/span>\u5c06\u4f1a\u4ecb\u7ecd\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u60f3\u6df1\u5165\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\uff0c\u53ef\u4ee5\u5173\u6ce8\u6211\uff01\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\u7684\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u80fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729928247671c9c37a020c.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u4e2d\u7684\u5e94\u7528<\/strong><\/p>\n<p><strong>\u5f15\u8a00<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b\u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u4f8b\uff0c\u5b83\u5f3a\u8c03\u4e0d\u53ef\u53d8\u6027\u3001\u7eaf\u51fd\u6570\u548c\u60f0\u6027\u6c42\u503c\u3002\u5728\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u65b9\u9762\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u4f9b\u4e86\u7b80\u7ea6\u3001\u53ef\u7ec4\u5408\u548c\u53ef\u5e76\u53d1\u6267\u884c\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<p><strong>Java 8 \u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027<\/strong><\/p>\n<p>\u4ece Java 8 \u5f00\u59cb\uff0cJava \u5f15\u5165\u4e86\u51fd\u6570\u5f0f\u7f16\u7a0b\u529f\u80fd\uff0c\u5305\u62ec Lambda \u8868\u8fbe\u5f0f\u3001\u65b9\u6cd5\u5f15\u7528\u548c Stream API\u3002\u8fd9\u4e9b\u7279\u6027\u4f7f\u5f00\u53d1\u4eba\u5458\u80fd\u591f\u7528\u66f4\u7b80\u6d01\u3001\u66f4\u5177\u8868\u73b0\u529b\u7684\u65b9\u5f0f\u7f16\u5199\u4ee3\u7801\u3002<\/p>\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a\u6570\u636e\u5904\u7406\u7ba1\u9053<\/strong><\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5b66\u751f\u6210\u7ee9\u8bb0\u5f55\u7684\u6570\u636e\u96c6\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u8be5\u6570\u636e\u96c6\u8fdb\u884c\u4ee5\u4e0b\u5904\u7406\uff1a<\/p>\n<ol>\n<li>\u6309\u5e73\u5747\u5206\u5bf9\u5b66\u751f\u8fdb\u884c\u6392\u5e8f<\/li>\n<li>\u8fc7\u6ee4\u6389\u5e73\u5747\u5206\u4f4e\u4e8e 70 \u7684\u5b66\u751f<\/li>\n<li>\u8ba1\u7b97\u6240\u6709\u5b66\u751f\u7684\u5e73\u5747\u5206<\/li>\n<\/ol>\n<p><strong>\u51fd\u6570\u5f0f\u89e3\u51b3\u65b9\u6848\uff1a<\/strong><\/p>\n<pre>List&lt;Student&gt; students = ... \/\/ \u8bfb\u53d6\u5b66\u751f\u6210\u7ee9\u8bb0\u5f55\n\n\/\/ \u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u6392\u5e8f\nList&lt;Student&gt; sortedStudents = students.stream()\n        .sorted(Comparator.comparing(Student::getAvgScore).reversed())\n        .toList();\n\n\/\/ \u4f7f\u7528\u65b9\u6cd5\u5f15\u7528\u548c Stream API \u8fc7\u6ee4\nList&lt;Student&gt; filteredStudents = sortedStudents.stream()\n        .filter(Student::isPassing)\n        .toList();\n\n\/\/ \u4f7f\u7528 Stream API \u8ba1\u7b97\u5e73\u5747\u5206\ndouble avgScore = filteredStudents.stream()\n        .mapToDouble(Student::getAvgScore)\n        .average()\n        .orElse(0.0);<\/pre>\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5c06\u6392\u5e8f\u89c4\u5219\u5b9a\u4e49\u4e3a\u4e00\u4e2a\u72ec\u7acb\u7684\u51fd\u6570\u3002\u65b9\u6cd5\u5f15\u7528 <code>Student::isPassing<\/code> \u7528\u4f5c\u8fc7\u6ee4\u6761\u4ef6\u3002Stream API \u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u65b9\u6cd5\uff0c\u5982 <code>average()<\/code>\uff0c\u7528\u4e8e\u805a\u5408\u6570\u636e\u3002<\/p>\n<p><strong>\u4f18\u70b9<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u4e2d\u7684\u4f18\u70b9\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u7b80\u7ea6\u6027\uff1a<\/strong>Lambda \u8868\u8fbe\u5f0f\u548c\u65b9\u6cd5\u5f15\u7528\u4f7f\u4ee3\u7801\u66f4\u7b80\u6d01\u3001\u66f4\u6613\u8bfb\u3002<\/li>\n<li><strong>\u53ef\u7ec4\u5408\u6027\uff1a<\/strong>\u51fd\u6570\u53ef\u4ee5\u8f7b\u677e\u7ec4\u5408\uff0c\u521b\u5efa\u590d\u6742\u7684\u6570\u636e\u5904\u7406\u7ba1\u9053\u3002<\/li>\n<li><strong>\u5e76\u53d1\u6027\uff1a<\/strong>Stream API \u652f\u6301\u5e76\u53d1\u6267\u884c\uff0c\u63d0\u9ad8\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u65f6\u7684\u6548\u7387\u3002<\/li>\n<\/ul>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>Java \u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\u63d0\u4f9b\u4e86\u7528\u4e8e\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u7684\u5f3a\u5927\u5de5\u5177\u3002\u901a\u8fc7\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u3001\u65b9\u6cd5\u5f15\u7528\u548c Stream API\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u7f16\u5199\u7b80\u7ea6\u3001\u53ef\u6269\u5c55\u548c\u9ad8\u6027\u80fd\u7684\u4ee3\u7801\u6765\u5904\u7406\u590d\u6742\u7684\u6570\u636e\u96c6\u3002<\/p>\n<p>\u672c\u7bc7\u5173\u4e8e\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u4e2d\u7684\u5e94\u7528\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u5904\u7406\u548c\u5206&#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-202655","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202655","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=202655"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202655\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202655"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202655"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}