{"id":65852,"date":"2025-05-03T11:48:17","date_gmt":"2025-05-03T03:48:17","guid":{"rendered":"https:\/\/fwq.ai\/blog\/65852\/"},"modified":"2025-05-03T11:48:17","modified_gmt":"2025-05-03T03:48:17","slug":"java%e6%80%8e%e4%b9%88%e5%88%a4%e6%96%ad%e6%95%b0%e7%bb%84%e5%af%b9%e8%b1%a1%e4%b8%ba%e7%a9%ba-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/65852\/","title":{"rendered":"JAVA\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u5bf9\u8c61\u4e3a\u7a7a"},"content":{"rendered":"

\n \u786e\u5b9a java \u6570\u7ec4\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u7684\u65b9\u6cd5\u6709\uff1a\u68c0\u67e5 length \u5c5e\u6027\u662f\u5426\u4e3a 0\u4f7f\u7528 array.isempty() \u65b9\u6cd5\u4f7f\u7528 objects.isnull() \u65b9\u6cd5\uff0c\u5bf9\u4e8e\u6570\u7ec4\u5bf9\u8c61\uff0c\u5b83\u7b49\u540c\u4e8e\u68c0\u67e5 length \u5c5e\u6027\u662f\u5426\u4e3a 0\n<\/p><\/blockquote>\n

\"JAVA\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u5bf9\u8c61\u4e3a\u7a7a\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u5224\u65ad Java \u6570\u7ec4\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\uff1f<\/strong><\/p>\n

\u5224\u65ad Java \u6570\u7ec4\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u6709\u591a\u79cd\u65b9\u6cd5\uff1a<\/p>\n

\u4f7f\u7528 length \u5c5e\u6027<\/strong><\/p>\n

\u6570\u7ec4\u7684 length \u5c5e\u6027\u8fd4\u56de\u5176\u957f\u5ea6\u3002\u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff0c\u5219\u5176\u957f\u5ea6\u4e3a 0\u3002<\/p>\n

\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n

int[] numbers = null;\n\nif (numbers != null && numbers.length == 0) {\n    System.out.println(\"\u6570\u7ec4\u4e3a\u7a7a\");\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4f7f\u7528 Array.isEmpty() \u65b9\u6cd5<\/strong><\/p>\n
Array.isEmpty(Object[]) \u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u6570\u7ec4\u5bf9\u8c61\u5e76\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u6307\u793a\u8be5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n
int[] numbers = null;\n\nif (Array.isEmpty(numbers)) {\n    System.out.println(\"\u6570\u7ec4\u4e3a\u7a7a\");\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4f7f\u7528 Objects.isNull() \u65b9\u6cd5<\/strong><\/p>\n
Objects.isNull(Object) \u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u5bf9\u8c61\u5e76\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u6307\u793a\u8be5\u5bf9\u8c61\u662f\u5426\u4e3a null\u3002\u5bf9\u4e8e\u6570\u7ec4\u5bf9\u8c61\uff0c\u5b83\u7b49\u540c\u4e8e\u68c0\u67e5 length \u5c5e\u6027\u662f\u5426\u4e3a 0\u3002<\/p>\n
int[] numbers = null;\n\nif (Objects.isNull(numbers) || numbers.length == 0) {\n    System.out.println(\"\u6570\u7ec4\u4e3a\u7a7a\");\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6ce8\u610f\uff1a<\/strong><\/p>\n
    \n
  • \u4e0a\u8ff0\u65b9\u6cd5\u53ea\u9002\u7528\u4e8e\u5f15\u7528\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u4f8b\u5982 int[]\u3001String[]\u3002\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5982 int[]\uff0clength \u5c5e\u6027\u59cb\u7ec8\u5927\u4e8e 0\u3002<\/li>\n
  • \u5bf9\u4e8e\u591a\u7ef4\u6570\u7ec4\uff0c\u9700\u8981\u9012\u5f52\u5730\u68c0\u67e5\u6bcf\u4e2a\u7ef4\u5ea6\uff0c\u4ee5\u786e\u5b9a\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002<\/li>\n<\/ul>\n
    \u4ee5\u4e0a\u5c31\u662fJAVA\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u5bf9\u8c61\u4e3a\u7a7a\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u786e\u5b9a java \u6570\u7ec4\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u7684\u65b9\u6cd5\u6709\uff1a\u68c0\u67e5 length \u5c5e\u6027\u662f\u5426\u4e3a 0\u4f7f\u7528 array.isempty() \u65b9\u6cd5\u4f7f\u7528 objects.isnull() \u65b9\u6cd5\uff0c\u5bf9\u4e8e\u6570\u7ec4\u5bf9\u8c61\uff0c\u5b83\u7b49\u540c\u4e8e\u68c0\u67e5 length \u5c5e\u6027\u662f\u5426\u4e3a 0 \u5982\u4f55\u5224\u65ad Java \u6570\u7ec4\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\uff1f \u5224\u65ad Java \u6570\u7ec4\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u6709\u591a\u79cd\u65b9\u6cd5\uff1a \u4f7f\u7528 length \u5c5e\u6027 \u6570\u7ec4\u7684 length \u5c5e\u6027\u8fd4\u56de\u5176\u957f\u5ea6\u3002\u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff0c\u5219\u5176\u957f\u5ea6\u4e3a 0\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b int[] numbers = null; if (numbers != null && numbers.length == 0) { System.out.println(“\u6570\u7ec4\u4e3a\u7a7a”); } \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528 Array.isEmpty() \u65b9\u6cd5 Array.isEmpty(Object[]) \u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u6570\u7ec4\u5bf9\u8c61\u5e76\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u6307\u793a\u8be5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002 int[] numbers = null; if (Array.isEmpty(numbers)) { […]<\/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-65852","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65852","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=65852"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65852\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=65852"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=65852"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=65852"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}