{"id":202527,"date":"2025-05-22T10:39:43","date_gmt":"2025-05-22T02:39:43","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202527\/"},"modified":"2025-05-22T10:39:43","modified_gmt":"2025-05-22T02:39:43","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8predicate%e5%bc%82%e5%b8%b8%e5%a4%84%e7%90%86%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202527\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u4f7f\u7528Predicate\u5f02\u5e38\u5904\u7406\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u4f7f\u7528Predicate\u5f02\u5e38\u5904\u7406\uff1f<\/h1>\n<p>\u5077\u5077\u52aa\u529b\uff0c\u6084\u65e0\u58f0\u606f\u5730\u53d8\u5f3a\uff0c\u7136\u540e\u60ca\u8273\u6240\u6709\u4eba\uff01\u54c8\u54c8\uff0c\u5c0f\u4f19\u4f34\u4eec\u53c8\u6765\u5b66\u4e60\u5566~\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u4f7f\u7528Predicate\u5f02\u5e38\u5904\u7406\uff1f\u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u4e0d\u77e5\u9053\u5927\u5bb6\u5bf9\u5176\u90fd\u6709\u591a\u5c11\u4e86\u89e3\uff0c\u4e0b\u9762\u6211\u4eec\u5c31\u4e00\u8d77\u6765\u770b\u4e00\u5427\uff01\u5f53\u7136\uff0c\u975e\u5e38\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u8bc4\u8bba\uff0c\u7ed9\u51fa\u5408\u7406\u7684\u5efa\u8bae\uff0c\u6211\u4eec\u4e00\u8d77\u5b66\u4e60\uff0c\u4e00\u8d77\u8fdb\u6b65\uff01<\/p>\n<p>\u5728Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d,\u4f7f\u7528Predicate\u63a5\u53e3\u8fdb\u884c\u5f02\u5e38\u5904\u7406,\u4f18\u70b9\u5305\u62ec\u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u3001\u6a21\u5757\u5316\u548c\u91cd\u7528\u7387\u3002\u901a\u8fc7Predicate\u9a8c\u8bc1\u7528\u6237\u8f93\u5165\u7684\u793a\u4f8b\u4ee3\u7801,\u9a8c\u8bc1\u975e\u7a7a\u8f93\u5165\u5e76\u629b\u51fa\u5f02\u5e38\u3002Predicate\u8fd8\u53ef\u7528\u4e8e\u5f02\u5e38\u5904\u7406\u8fc7\u6ee4\u5668\u3001\u6d41\u7ba1\u9053\u4e2d\u7684\u9519\u8bef\u5904\u7406\u548c\u590d\u6742\u6761\u4ef6\u903b\u8f91\u7b49\u573a\u666f\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729914950671c6846b25a5.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\uff1a\u4f7f\u7528 Predicate \u8fdb\u884c\u5f02\u5e38\u5904\u7406<\/strong><\/p>\n<p>\u5728 Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\uff0cPredicate \u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b83\u63a5\u53d7\u4e00\u4e2a\u7c7b\u578b\u4e3a T \u7684\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a boolean \u503c\u3002\u5b83\u53ef\u4ee5\u7528\u6765\u5728\u6d41\u6216\u96c6\u5408\u4e2d\u8fc7\u6ee4\u5143\u7d20\uff0c\u5e76\u5e7f\u6cdb\u7528\u4e8e\u5f02\u5e38\u5904\u7406\u3002<\/p>\n<p><strong>\u4f18\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/li>\n<li>\u901a\u8fc7\u5c06\u5f02\u5e38\u5904\u7406\u4e0e\u4e1a\u52a1\u903b\u8f91\u5206\u79bb\uff0c\u63d0\u9ad8\u4ee3\u7801\u7684\u6a21\u5757\u5316\u3002<\/li>\n<li>\u65b9\u4fbf\u5728\u9700\u8981\u65f6\u91cd\u7528\u5f02\u5e38\u5904\u7406\u903b\u8f91\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a<\/strong><\/p>\n<p>\u6211\u4eec\u521b\u5efa\u4e00\u4e2a <code>validateInput<\/code> \u65b9\u6cd5\uff0c\u5b83\u4f7f\u7528 Predicate \u6765\u9a8c\u8bc1\u7528\u6237\u8f93\u5165\uff1a<\/p>\n<pre>import java.util.function.Predicate;\n\npublic class InputValidator {\n\n    public static void validateInput(String input) {\n        Predicate&lt;String&gt; notEmpty = s -&gt; !s.isEmpty();\n        \n        if (notEmpty.test(input)) {\n            \/\/ \u5904\u7406\u6709\u6548\u7684\u8f93\u5165\n        } else {\n            throw new IllegalArgumentException(\"\u8f93\u5165\u4e0d\u80fd\u4e3a\u7a7a\");\n        }\n    }\n\n}<\/pre>\n<p><strong>\u7528\u6cd5\uff1a<\/strong><\/p>\n<pre>try {\n    InputValidator.validateInput(userInput);\n    \/\/ ... \u6267\u884c\u5176\u4ed6\u64cd\u4f5c ...\n} catch (IllegalArgumentException e) {\n    \/\/ \u5904\u7406\u65e0\u6548\u8f93\u5165\n}<\/pre>\n<p><strong>\u4f18\u52bf\uff1a<\/strong><\/p>\n<ul>\n<li>\u901a\u8fc7\u5c06\u5f02\u5e38\u5904\u7406\u59d4\u6258\u7ed9 Predicate\uff0c\u6211\u4eec\u4f7f <code>validateInput<\/code> \u65b9\u6cd5\u53ea\u5173\u6ce8\u4e1a\u52a1\u903b\u8f91\uff08\u9a8c\u8bc1\u8f93\u5165\uff09\u3002<\/li>\n<li><code>notEmpty<\/code> Predicate \u53ef\u4ee5\u8f7b\u677e\u91cd\u7528\u4e8e\u5176\u4ed6\u9700\u8981\u68c0\u67e5\u975e\u7a7a\u8f93\u5165\u7684\u5730\u65b9\u3002<\/li>\n<\/ul>\n<p><strong>\u5176\u4ed6\u7528\u6cd5\uff1a<\/strong><\/p>\n<p>Predicate \u8fd8\u53ef\u4ee5\u7528\u4e8e\uff1a<\/p>\n<ul>\n<li>\u5f02\u5e38\u5904\u7406\u8fc7\u6ee4\u5668<\/li>\n<li>\u6d41\u7ba1\u9053\u4e2d\u7684\u9519\u8bef\u5904\u7406<\/li>\n<li>\u590d\u6742\u6761\u4ef6\u903b\u8f91<\/li>\n<\/ul>\n<p><strong>\u7ed3\u8bba\uff1a<\/strong><\/p>\n<p>\u4f7f\u7528 Predicate \u8fdb\u884c Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u7684\u5f02\u5e38\u5904\u7406\u662f\u4e00\u79cd\u5f3a\u5927\u800c\u7075\u6d3b\u7684\u6280\u672f\u3002\u5b83\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\uff0c\u540c\u65f6\u7b80\u5316\u5f02\u5e38\u5904\u7406\u903b\u8f91\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u4f7f\u7528Predicate\u5f02\u5e38\u5904\u7406\uff1f\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u4f7f\u7528Pre&#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-202527","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202527","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=202527"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202527\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}