{"id":38122,"date":"2024-11-26T13:19:06","date_gmt":"2024-11-26T05:19:06","guid":{"rendered":"https:\/\/fwq.ai\/blog\/38122\/"},"modified":"2024-11-26T13:19:06","modified_gmt":"2024-11-26T05:19:06","slug":"java%e7%a8%8b%e5%ba%8f%e6%80%8e%e4%b9%88%e5%88%a4%e6%96%ad%e6%95%b0%e7%bb%84%e4%b8%ba%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/38122\/","title":{"rendered":"java\u7a0b\u5e8f\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u4e3a\u7a7a"},"content":{"rendered":"<blockquote><p>\n  \u5224\u65ad java \u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u7684\u65b9\u6cd5\uff1a\u4f7f\u7528 length \u5c5e\u6027\u68c0\u67e5\u6570\u7ec4\u957f\u5ea6\u3002\u4f7f\u7528 arrays.isempty() \u65b9\u6cd5\u3002\u4f7f\u7528 == null \u5224\u65ad\u6570\u7ec4\u662f\u5426\u5c1a\u672a\u521b\u5efa\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111317245937042.jpg\" class=\"aligncenter\" title=\"java\u7a0b\u5e8f\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u4e3a\u7a7a\u63d2\u56fe\" alt=\"java\u7a0b\u5e8f\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u4e3a\u7a7a\u63d2\u56fe\" \/><\/p>\n<p><strong>Java\u5224\u65ad\u6570\u7ec4\u4e3a\u7a7a\u7684\u65b9\u6cd5<\/strong><\/p>\n<p><strong>1. \u4f7f\u7528length\u5c5e\u6027<\/strong><\/p>\n<pre>int[] arr = new int[5];\n\nif (arr.length == 0) {\n    \/\/ \u6570\u7ec4\u4e3a\u7a7a\n} else {\n    \/\/ \u6570\u7ec4\u4e0d\u4e3a\u7a7a\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u4f7f\u7528Arrays.isEmpty()\u65b9\u6cd5<\/strong><\/p>\n<p>Arrays\u7c7b\u63d0\u4f9b\u4e86\u4e00\u4e2aisEmpty()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff1a<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>import java.util.Arrays;\n\nint[] arr = new int[5];\n\nif (Arrays.isEmpty(arr)) {\n    \/\/ \u6570\u7ec4\u4e3a\u7a7a\n} else {\n    \/\/ \u6570\u7ec4\u4e0d\u4e3a\u7a7a\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>3. \u4f7f\u7528== null\u5224\u65ad<\/strong><\/p>\n<p>\u5982\u679c\u6570\u7ec4\u8fd8\u6ca1\u6709\u521b\u5efa\uff0c\u53ef\u4ee5\u4f7f\u7528== null\u5224\u65ad\u6765\u786e\u5b9a\u662f\u5426\u4e3a\u7a7a\uff1a<\/p>\n<pre>int[] arr; \/\/ \u6570\u7ec4\u5c1a\u672a\u521b\u5efa\n\nif (arr == null) {\n    \/\/ \u6570\u7ec4\u4e3a\u7a7a\n} else {\n    \/\/ \u6570\u7ec4\u5df2\u7ecf\u521b\u5efa\uff0c\u4f46\u53ef\u80fd\u4e3a\u7a7a\u6216\u975e\u7a7a\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a<\/strong><\/p>\n<ul>\n<li>isNull()\u65b9\u6cd5\u53ea\u80fd\u5224\u65ad\u6570\u7ec4\u662f\u5426\u8fd8\u6ca1\u6709\u521b\u5efa\uff0c\u4e0d\u80fd\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002<\/li>\n<li>== null\u5224\u65ad\u53ea\u80fd\u5224\u65ad\u6570\u7ec4\u662f\u5426\u5c1a\u672a\u521b\u5efa\uff0c\u4e0d\u80fd\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002<\/li>\n<li>length\u5c5e\u6027\u548cisEmpty()\u65b9\u6cd5\u90fd\u53ef\u4ee5\u5224\u65ad\u6570\u7ec4\u662f\u5426\u5df2\u7ecf\u88ab\u521b\u5efa\u548c\u662f\u5426\u4e3a\u7a7a\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u7a0b\u5e8f\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u4e3a\u7a7a\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>\u5224\u65ad java \u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u7684\u65b9\u6cd5\uff1a\u4f7f\u7528 length \u5c5e\u6027\u68c0\u67e5\u6570\u7ec4\u957f\u5ea6\u3002\u4f7f\u7528 arrays.isempty() \u65b9\u6cd5\u3002\u4f7f\u7528 == null \u5224\u65ad\u6570\u7ec4\u662f\u5426\u5c1a\u672a\u521b\u5efa\u3002 Java\u5224\u65ad\u6570\u7ec4\u4e3a\u7a7a\u7684\u65b9\u6cd5 1. \u4f7f\u7528length\u5c5e\u6027 int[] arr = new int[5]; if (arr.length == 0) { \/\/ \u6570\u7ec4\u4e3a\u7a7a } else { \/\/ \u6570\u7ec4\u4e0d\u4e3a\u7a7a } \u767b\u5f55\u540e\u590d\u5236 2. \u4f7f\u7528Arrays.isEmpty()\u65b9\u6cd5 Arrays\u7c7b\u63d0\u4f9b\u4e86\u4e00\u4e2aisEmpty()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b import java.util.Arrays; int[] arr = new int[5]; if (Arrays.isEmpty(arr)) { \/\/ \u6570\u7ec4\u4e3a\u7a7a } else { \/\/ \u6570\u7ec4\u4e0d\u4e3a\u7a7a } \u767b\u5f55\u540e\u590d\u5236 [&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-38122","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38122","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=38122"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38122\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=38122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=38122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=38122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}