{"id":65849,"date":"2025-05-03T10:46:40","date_gmt":"2025-05-03T02:46:40","guid":{"rendered":"https:\/\/fwq.ai\/blog\/65849\/"},"modified":"2025-05-03T10:46:40","modified_gmt":"2025-05-03T02:46:40","slug":"java%e6%80%8e%e4%b9%88%e5%88%a4%e6%96%ad%e6%95%b0%e7%bb%84%e4%b8%ad%e6%9c%89%e7%a9%ba%e5%80%bc-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/65849\/","title":{"rendered":"java\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u4e2d\u6709\u7a7a\u503c"},"content":{"rendered":"

\n \u5728 java \u4e2d\u5224\u65ad\u6570\u7ec4\u4e2d\u662f\u5426\u6709\u7a7a\u503c\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528 isempty() \u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u6216\u957f\u5ea6\u4e3a 0\u3002\u4f7f\u7528 contains(null) \u68c0\u67e5\u6570\u7ec4\u4e2d\u662f\u5426\u5305\u542b null \u503c\u3002\u4f7f\u7528 arrays.aslist \u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a list\uff0c\u7136\u540e\u4f7f\u7528 contains(null) \u68c0\u67e5 list \u4e2d\u662f\u5426\u5305\u542b null\u3002\n<\/p><\/blockquote>\n

\"java\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u4e2d\u6709\u7a7a\u503c\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u5728 Java \u4e2d\u5224\u65ad\u6570\u7ec4\u4e2d\u662f\u5426\u6709\u7a7a\u503c<\/strong><\/p>\n

Java \u4e2d\u5224\u65ad\u6570\u7ec4\u662f\u5426\u6709\u7a7a\u503c\u7684\u5e38\u7528\u65b9\u6cd5\u662f\u4f7f\u7528 isEmpty()\u3001contns(null) \u548c Arrays.asList \u65b9\u6cd5\u3002<\/p>\n

\u65b9\u6cd5 1\uff1aisEmpty()<\/strong><\/p>\n

isEmpty() \u65b9\u6cd5\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u6216\u957f\u5ea6\u4e3a 0\u3002\u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff0c\u5219\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002<\/p>\n

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

int[] arr = {1, 2, 3};\nSystem.out.println(arr.isEmpty()); \/\/ \u8f93\u51fa\uff1afalse<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u65b9\u6cd5 2\uff1acontains(null)<\/strong><\/p>\n
contains(null) \u65b9\u6cd5\u68c0\u67e5\u6570\u7ec4\u4e2d\u662f\u5426\u5305\u542b null \u503c\u3002\u5982\u679c\u6570\u7ec4\u4e2d\u5b58\u5728 null\uff0c\u5219\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002<\/p>\n
int[] arr = {1, 2, null};\nSystem.out.println(Arrays.asList(arr).contains(null)); \/\/ \u8f93\u51fa\uff1atrue<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u65b9\u6cd5 3\uff1aArrays.asList<\/strong><\/p>\n
Arrays.asList() \u65b9\u6cd5\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e00\u4e2a List\u3002\u7136\u540e\u53ef\u4ee5\u4f7f\u7528 contains(null) \u65b9\u6cd5\u68c0\u67e5 List \u4e2d\u662f\u5426\u5305\u542b null\u3002<\/p>\n
int[] arr = {1, 2, null};\nSystem.out.println(Arrays.asList(arr).contains(null)); \/\/ \u8f93\u51fa\uff1atrue<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6ce8\u610f\uff1a<\/strong><\/p>\n
    \n
  • \u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\uff0c\u5982 int[]\u3001double[] \u7b49\uff0cisEmpty() \u65b9\u6cd5\u4e0d\u53ef\u7528\u3002<\/li>\n
  • contains(null) \u65b9\u6cd5\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\u548c\u5f15\u7528\u7c7b\u578b\u6570\u7ec4\u90fd\u53ef\u7528\u3002<\/li>\n
  • Arrays.asList \u65b9\u6cd5\u4ec5\u9002\u7528\u4e8e\u5f15\u7528\u7c7b\u578b\u6570\u7ec4\uff0c\u5982 Object[]\u3001String[] \u7b49\u3002<\/li>\n<\/ul>\n
    \u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u4e2d\u6709\u7a7a\u503c\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5728 java \u4e2d\u5224\u65ad\u6570\u7ec4\u4e2d\u662f\u5426\u6709\u7a7a\u503c\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528 isempty() \u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u6216\u957f\u5ea6\u4e3a 0\u3002\u4f7f\u7528 contains(null) \u68c0\u67e5\u6570\u7ec4\u4e2d\u662f\u5426\u5305\u542b null \u503c\u3002\u4f7f\u7528 arrays.aslist \u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a list\uff0c\u7136\u540e\u4f7f\u7528 contains(null) \u68c0\u67e5 list \u4e2d\u662f\u5426\u5305\u542b null\u3002 \u5982\u4f55\u5728 Java \u4e2d\u5224\u65ad\u6570\u7ec4\u4e2d\u662f\u5426\u6709\u7a7a\u503c Java \u4e2d\u5224\u65ad\u6570\u7ec4\u662f\u5426\u6709\u7a7a\u503c\u7684\u5e38\u7528\u65b9\u6cd5\u662f\u4f7f\u7528 isEmpty()\u3001contns(null) \u548c Arrays.asList \u65b9\u6cd5\u3002 \u65b9\u6cd5 1\uff1aisEmpty() isEmpty() \u65b9\u6cd5\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u6216\u957f\u5ea6\u4e3a 0\u3002\u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff0c\u5219\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b int[] arr = {1, 2, 3}; System.out.println(arr.isEmpty()); \/\/ \u8f93\u51fa\uff1afalse \u767b\u5f55\u540e\u590d\u5236 \u65b9\u6cd5 2\uff1acontains(null) contains(null) \u65b9\u6cd5\u68c0\u67e5\u6570\u7ec4\u4e2d\u662f\u5426\u5305\u542b null \u503c\u3002\u5982\u679c\u6570\u7ec4\u4e2d\u5b58\u5728 null\uff0c\u5219\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002 int[] […]<\/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-65849","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65849","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=65849"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65849\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=65849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=65849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=65849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}