{"id":2340,"date":"2025-11-21T20:35:11","date_gmt":"2025-11-21T12:35:11","guid":{"rendered":"https:\/\/zhenti.52daan.com\/?p=2340"},"modified":"2025-11-21T20:35:11","modified_gmt":"2025-11-21T12:35:11","slug":"%e8%ae%be%e6%9c%89%e5%a6%82%e4%b8%8b%e4%bb%a3%e7%a0%81%e6%ae%b5-1-string-s-null-2-if-s-null-s-length-0-3-system-out-printlns-null-s-length-0-4-if-s-null","status":"publish","type":"post","link":"https:\/\/zhenti.52daan.com\/?p=2340","title":{"rendered":"\u8bbe\u6709\u5982\u4e0b\u4ee3\u7801\u6bb5 1 String s = null; 2 if ( s != null & s.length() > 0) 3 System.out.println(“s != null & s.length() > 0”); 4 if ( s != null && s.length() > 0) 5 System.out.println(“s != null & s.length() > 0”); 6 if ( s != null || s.length() > 0) 7 System.out.println(“s != null & s.length() > 0”); 8 if ( s != null | s.length() > 0) 9 System.out.println(“s != null | s.length() > 0”); \u54ea\u4e9b\u884c\u5c06\u629b\u51fa\u7a7a\u6307\u9488\u5f02\u5e38? \u5047\u8bbe\u5728\u68c0\u67e5\u8fc7\u7a0b\u4e2d\u628a\u629b\u51fa\u5f02\u5e38\u7684if\u8bed\u53e5\u6ce8\u91ca\u6389\u7ee7\u7eed\u9a8c\u8bc1. A.2,4 B.2,4,6,8 C.2,6,8 D.6,8"},"content":{"rendered":"

\u8bbe\u6709\u5982\u4e0b\u4ee3\u7801\u6bb5 1 String s = null; 2 if ( s != null & s.length() > 0) 3 System.out.println(“s != null & s.length() > 0”); 4 if ( s != null && s.length() > 0) 5 System.out.println(“s != null & s.length() > 0”); 6 if ( s != null || s.length() > 0) 7 System.out.println(“s != null & s.length() > 0”); 8 if ( s != null | s.length() > 0) 9 System.out.println(“s != null | s.length() > 0”); \u54ea\u4e9b\u884c\u5c06\u629b\u51fa\u7a7a\u6307\u9488\u5f02\u5e38? \u5047\u8bbe\u5728\u68c0\u67e5\u8fc7\u7a0b\u4e2d\u628a\u629b\u51fa\u5f02\u5e38\u7684if\u8bed\u53e5\u6ce8\u91ca\u6389\u7ee7\u7eed\u9a8c\u8bc1. A.2,4 B.2,4,6,8 C.2,6,8 D.6,8<\/p>\n

\u6b63\u786e\u7b54\u6848\uff1aC<\/p>\n","protected":false},"excerpt":{"rendered":"

\u8bbe\u6709\u5982\u4e0b\u4ee3\u7801\u6bb5 1 String...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[94],"class_list":["post-2340","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java"],"_links":{"self":[{"href":"https:\/\/zhenti.52daan.com\/index.php?rest_route=\/wp\/v2\/posts\/2340","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhenti.52daan.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhenti.52daan.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhenti.52daan.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhenti.52daan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2340"}],"version-history":[{"count":0,"href":"https:\/\/zhenti.52daan.com\/index.php?rest_route=\/wp\/v2\/posts\/2340\/revisions"}],"wp:attachment":[{"href":"https:\/\/zhenti.52daan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2340"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhenti.52daan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2340"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhenti.52daan.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2340"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}