{"id":39231,"date":"2024-11-26T15:33:01","date_gmt":"2024-11-26T07:33:01","guid":{"rendered":"https:\/\/fwq.ai\/blog\/39231\/"},"modified":"2024-11-26T15:33:01","modified_gmt":"2024-11-26T07:33:01","slug":"java%e7%a9%ba%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%95%b0%e7%bb%84%e6%80%8e%e4%b9%88%e5%88%a4%e6%96%ad","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/39231\/","title":{"rendered":"java\u7a7a\u5b57\u7b26\u4e32\u6570\u7ec4\u600e\u4e48\u5224\u65ad"},"content":{"rendered":"<blockquote><p>\n  java \u4e2d\u5224\u65ad\u7a7a\u5b57\u7b26\u4e32\u6570\u7ec4\u7684\u4e24\u79cd\u65b9\u6cd5\uff1a1. \u4f7f\u7528 length \u5c5e\u6027\uff0c\u5982\u679c length \u7b49\u4e8e 0\uff0c\u5219\u6570\u7ec4\u4e3a\u7a7a\uff1b2. \u4f7f\u7528 isempty() \u65b9\u6cd5\uff08\u9700\u8981 java 8+\uff09\uff0c\u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff0c\u5219\u8fd4\u56de true\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/16\/2024111605313058255.jpg\" class=\"aligncenter\" title=\"java\u7a7a\u5b57\u7b26\u4e32\u6570\u7ec4\u600e\u4e48\u5224\u65ad\u63d2\u56fe\" alt=\"java\u7a7a\u5b57\u7b26\u4e32\u6570\u7ec4\u600e\u4e48\u5224\u65ad\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5224\u65ad Java \u4e2d\u7684\u7a7a<\/strong><\/p>\n<p><strong>\u5224\u65ad\u7a7a\u5b57\u7b26\u4e32\u6570\u7ec4\u7684\u4e24\u79cd\u65b9\u6cd5\uff1a<\/strong><\/p>\n<p><strong>1. \u4f7f\u7528 length \u5c5e\u6027\uff1a<\/strong><\/p>\n<ul>\n<li>length \u5c5e\u6027\u6307\u793a\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002<\/li>\n<li>\u5982\u679c length \u7b49\u4e8e 0\uff0c\u5219\u6570\u7ec4\u4e3a\u7a7a\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>String[] arr = new String[0];\n\nif (arr.length == 0) {\n  System.out.println(\"\u6570\u7ec4\u4e3a\u7a7a\");\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u4f7f\u7528 isEmpty() \u65b9\u6cd5\uff08\u9700\u8981 Java 8+\uff09\uff1a<\/strong><\/p>\n<ul>\n<li>isEmpty() \u65b9\u6cd5\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002<\/li>\n<li>\u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff0c\u5219\u8fd4\u56de true\uff1b\u5426\u5219\u8fd4\u56de false\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>String[] arr = new String[0];\n\nif (Arrays.isEmpty(arr)) {\n  System.out.println(\"\u6570\u7ec4\u4e3a\u7a7a\");\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u7a7a\u600e\u4e48\u5224\u65ad\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>java \u4e2d\u5224\u65ad\u7a7a\u5b57\u7b26\u4e32\u6570\u7ec4\u7684\u4e24\u79cd\u65b9\u6cd5\uff1a1. \u4f7f\u7528 length \u5c5e\u6027\uff0c\u5982\u679c length \u7b49\u4e8e 0\uff0c\u5219\u6570\u7ec4\u4e3a\u7a7a\uff1b2. \u4f7f\u7528 isempty() \u65b9\u6cd5\uff08\u9700\u8981 java 8+\uff09\uff0c\u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff0c\u5219\u8fd4\u56de true\u3002 \u5982\u4f55\u5224\u65ad Java \u4e2d\u7684\u7a7a \u5224\u65ad\u7a7a\u5b57\u7b26\u4e32\u6570\u7ec4\u7684\u4e24\u79cd\u65b9\u6cd5\uff1a 1. \u4f7f\u7528 length \u5c5e\u6027\uff1a length \u5c5e\u6027\u6307\u793a\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002 \u5982\u679c length \u7b49\u4e8e 0\uff0c\u5219\u6570\u7ec4\u4e3a\u7a7a\u3002 \u793a\u4f8b\u4ee3\u7801\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b String[] arr = new String[0]; if (arr.length == 0) { System.out.println(&#8220;\u6570\u7ec4\u4e3a\u7a7a&#8221;); } \u767b\u5f55\u540e\u590d\u5236 2. \u4f7f\u7528 isEmpty() \u65b9\u6cd5\uff08\u9700\u8981 Java 8+\uff09\uff1a isEmpty() \u65b9\u6cd5\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002 \u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff0c\u5219\u8fd4\u56de true\uff1b\u5426\u5219\u8fd4\u56de false\u3002 \u793a\u4f8b\u4ee3\u7801\uff1a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-39231","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39231","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=39231"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39231\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=39231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=39231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=39231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}