{"id":202759,"date":"2025-05-22T08:51:55","date_gmt":"2025-05-22T00:51:55","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202759\/"},"modified":"2025-05-22T08:51:55","modified_gmt":"2025-05-22T00:51:55","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e6%8e%a5%e5%8f%a3%e5%9c%a8%e5%a4%a7%e6%95%b0%e6%8d%ae%e5%a4%84%e7%90%86%e5%92%8c%e6%b5%81%e5%bc%8f%e5%88%86%e6%9e%90%e4%b8%ad%e7%9a%84%e6%84%8f%e4%b9%89%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202759\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u63a5\u53e3\u5728\u5927\u6570\u636e\u5904\u7406\u548c\u6d41\u5f0f\u5206\u6790\u4e2d\u7684\u610f\u4e49\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java\u51fd\u6570\u5f0f\u63a5\u53e3\u5728\u5927\u6570\u636e\u5904\u7406\u548c\u6d41\u5f0f\u5206\u6790\u4e2d\u7684\u610f\u4e49\uff1f<\/h1>\n<p>\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJava\u51fd\u6570\u5f0f\u63a5\u53e3\u5728\u5927\u6570\u636e\u5904\u7406\u548c\u6d41\u5f0f\u5206\u6790\u4e2d\u7684\u610f\u4e49\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729939350671cc796671aa.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u51fd\u6570\u5f0f\u63a5\u53e3\uff1a\u5927\u6570\u636e\u5904\u7406\u548c\u6d41\u5f0f\u5206\u6790\u7684\u57fa\u77f3<\/strong><\/p>\n<p><strong>\u7b80\u4ecb<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u63a5\u53e3\u662f Java \u4e2d\u4e00\u79cd\u7279\u6b8a\u7684\u63a5\u53e3\uff0c\u5b83\u53ea\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u3002\u5b83\u4eec\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\u548c\u54cd\u5e94\u5f0f\u7f16\u7a0b\u7b49\u9886\u57df\u4e2d\u53d1\u6325\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\uff0c\u7279\u522b\u662f\u5728\u5927\u6570\u636e\u5904\u7406\u548c\u6d41\u5f0f\u5206\u6790\u4e2d\u3002<\/p>\n<p><strong>\u51fd\u6570\u5f0f\u63a5\u53e3\u7684\u4f18\u70b9<\/strong><\/p>\n<ul>\n<li><strong>\u7b80\u5316\u4ee3\u7801\uff1a<\/strong>\u51fd\u6570\u5f0f\u63a5\u53e3\u5141\u8bb8\u6211\u4eec\u5c06\u4ee3\u7801\u8868\u793a\u4e3a\u4e00\u7cfb\u5217\u72ec\u7acb\u7684\u5757\uff0c\u4ece\u800c\u7b80\u5316\u4e86\u4ee3\u7801\u7ed3\u6784\u5e76\u63d0\u9ad8\u4e86\u53ef\u8bfb\u6027\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u53ef\u91cd\u7528\u6027\uff1a<\/strong>\u51fd\u6570\u5f0f\u63a5\u53e3\u53ef\u4ee5\u7528\u4f5c\u56de\u8c03\u65b9\u6cd5\u6216 lambda \u8868\u8fbe\u5f0f\u4e2d\u7684\u53c2\u6570\uff0c\u4f7f\u5176\u9ad8\u5ea6\u53ef\u91cd\u7528\u3002<\/li>\n<li><strong>\u652f\u6301\u5e76\u884c\u5904\u7406\uff1a<\/strong>\u5c06\u4efb\u52a1\u5206\u89e3\u4e3a\u51fd\u6570\u5f0f\u5757\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5e76\u884c\u5904\u7406\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a\u4f7f\u7528\u51fd\u6570\u5f0f\u63a5\u53e3\u8fdb\u884c\u6d41\u5f0f\u5206\u6790<\/strong><\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u60f3\u8981\u4f7f\u7528 Java Streams API \u5bf9\u4e00\u7ec4\u4e8b\u4ef6\u8fdb\u884c\u6d41\u5f0f\u5904\u7406\u5e76\u8ba1\u7b97\u6bcf\u4e2a\u4e8b\u4ef6\u7c7b\u578b\u7684\u6570\u91cf\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 <code>Consumer&lt;T&gt;<\/code> \u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u5b83\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\u5e76\u5bf9\u5176\u6267\u884c\u64cd\u4f5c\u3002<\/p>\n<pre>import java.util.List;\nimport java.util.Map;\nimport java.util.stream.Collectors;\n\npublic class StreamAnalysis {\n\n    public static void main(String[] args) {\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u4e8b\u4ef6\u5217\u8868\n        List&lt;Event&gt; events = \/* ... *\/;\n\n        \/\/ \u6839\u636e\u4e8b\u4ef6\u7c7b\u578b\u5bf9\u4e8b\u4ef6\u5206\u7ec4\u5e76\u8ba1\u6570\n        Map&lt;String, Long&gt; eventCounts = events.stream()\n                .collect(Collectors.groupingBy(Event::getType, Collectors.counting()));\n\n        \/\/ \u6253\u5370\u7ed3\u679c\n        System.out.println(eventCounts);\n    }\n}\n\nclass Event {\n    private String type;\n    \/\/ ...\n}<\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>Consumer&lt;Event&gt;<\/code> \u51fd\u6570\u5f0f\u63a5\u53e3\u88ab\u7528\u4e8e\u5bf9\u6bcf\u4e2a\u4e8b\u4ef6\u8fdb\u884c\u7c7b\u578b\u5206\u7ec4\u5e76\u8ba1\u6570\uff0c\u4ece\u800c\u5b9e\u73b0\u6d41\u5f0f\u5206\u6790\u3002<\/p>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>Java \u51fd\u6570\u5f0f\u63a5\u53e3\u4e3a\u5927\u6570\u636e\u5904\u7406\u548c\u6d41\u5f0f\u5206\u6790\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u529f\u80fd\u3002\u5b83\u4eec\u7b80\u5316\u4e86\u4ee3\u7801\u3001\u63d0\u9ad8\u4e86\u53ef\u91cd\u7528\u6027\u5e76\u652f\u6301\u5e76\u884c\u5904\u7406\uff0c\u4f7f\u5927\u6570\u636e\u5206\u6790\u4efb\u52a1\u66f4\u52a0\u9ad8\u6548\u548c\u7b80\u6d01\u3002<\/p>\n<p>\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u51fd\u6570\u5f0f\u63a5\u53e3\u5728\u5927\u6570\u636e\u5904\u7406\u548c&#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-202759","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202759","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=202759"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202759\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202759"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}