{"id":38152,"date":"2024-11-26T17:26:29","date_gmt":"2024-11-26T09:26:29","guid":{"rendered":"https:\/\/fwq.ai\/blog\/38152\/"},"modified":"2024-11-26T17:26:29","modified_gmt":"2024-11-26T09:26:29","slug":"java%e6%80%8e%e4%b9%88%e5%88%a4%e6%96%ad%e6%98%af%e5%90%a6%e6%95%b0%e7%bb%84%e6%98%af%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/38152\/","title":{"rendered":"java\u600e\u4e48\u5224\u65ad\u662f\u5426\u6570\u7ec4\u662f\u7a7a"},"content":{"rendered":"<blockquote><p>\n  \u5728 java \u4e2d\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u7684\u65b9\u6cd5\u6709\u4e24\u79cd\uff1a\u4f7f\u7528 array.getlength() \u65b9\u6cd5\uff1a\u5224\u65ad\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u5426\u4e3a 0\u3002\u4f7f\u7528 objects.isnull() \u6216 objects.nonnull() \u65b9\u6cd5\uff1a\u5224\u65ad\u6570\u7ec4\u672c\u8eab\u662f\u5426\u4e3a null \u6216\u957f\u5ea6\u662f\u5426\u4e3a 0\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/14\/2024111409400065832.jpg\" class=\"aligncenter\" title=\"java\u600e\u4e48\u5224\u65ad\u662f\u5426\u6570\u7ec4\u662f\u7a7a\u63d2\u56fe\" alt=\"java\u600e\u4e48\u5224\u65ad\u662f\u5426\u6570\u7ec4\u662f\u7a7a\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5224\u65ad Java \u6570\u7ec4\u662f\u5426\u4e3a\u7a7a<\/strong><\/p>\n<p>\u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e24\u79cd\u65b9\u6cd5\u6765\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528 Array.getLength() \u65b9\u6cd5\uff1a<\/strong><\/li>\n<\/ul>\n<pre>int[] arr = new int[0];\n\nif (arr.length == 0) {\n    System.out.println(\"\u6570\u7ec4\u4e3a\u7a7a\");\n} else {\n    System.out.println(\"\u6570\u7ec4\u4e0d\u4e3a\u7a7a\");\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<ul>\n<li><strong>\u4f7f\u7528 Objects.isNull() \u6216 Objects.nonNull() \u65b9\u6cd5\uff1a<\/strong><\/li>\n<\/ul>\n<pre>int[] arr = null;\n\nif (Objects.isNull(arr)) {\n    System.out.println(\"\u6570\u7ec4\u4e3a\u7a7a\");\n} else if (Objects.nonNull(arr) &amp;&amp; arr.length == 0) {\n    System.out.println(\"\u6570\u7ec4\u4e3a\u7a7a\");\n} else {\n    System.out.println(\"\u6570\u7ec4\u4e0d\u4e3a\u7a7a\");\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u65b9\u6cd5\u5bf9\u6bd4\uff1a<\/strong><\/p>\n<ul>\n<li>Array.getLength() \u65b9\u6cd5\u53ea\u80fd\u7528\u4e8e\u5185\u7f6e\u6570\u7ec4\uff0c\u4e0d\u80fd\u7528\u4e8e\u5bf9\u8c61\u6570\u7ec4\u3002<\/li>\n<li>Objects.isNull() \u548c Objects.nonNull() \u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u4f46\u5b83\u4f1a\u68c0\u67e5\u6570\u7ec4\u672c\u8eab\u662f\u5426\u4e3a null\uff0c\u800c\u4e0d\u662f\u68c0\u67e5\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u5426\u4e3a 0\u3002<\/li>\n<\/ul>\n<p>\u56e0\u6b64\uff0c\u5bf9\u4e8e\u9700\u8981\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u7684\u573a\u666f\uff0c\u63a8\u8350\u4f7f\u7528 Objects.isNull() \u6216 Objects.nonNull() \u65b9\u6cd5\u6765\u5224\u65ad\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u5224\u65ad\u662f\u5426\u6570\u7ec4\u662f\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>\u5728 java \u4e2d\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u7684\u65b9\u6cd5\u6709\u4e24\u79cd\uff1a\u4f7f\u7528 array.getlength() \u65b9\u6cd5\uff1a\u5224\u65ad\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u5426\u4e3a 0\u3002\u4f7f\u7528 objects.isnull() \u6216 objects.nonnull() \u65b9\u6cd5\uff1a\u5224\u65ad\u6570\u7ec4\u672c\u8eab\u662f\u5426\u4e3a null \u6216\u957f\u5ea6\u662f\u5426\u4e3a 0\u3002 \u5982\u4f55\u5224\u65ad Java \u6570\u7ec4\u662f\u5426\u4e3a\u7a7a \u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e24\u79cd\u65b9\u6cd5\u6765\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff1a \u4f7f\u7528 Array.getLength() \u65b9\u6cd5\uff1a int[] arr = new int[0]; if (arr.length == 0) { System.out.println(&#8220;\u6570\u7ec4\u4e3a\u7a7a&#8221;); } else { System.out.println(&#8220;\u6570\u7ec4\u4e0d\u4e3a\u7a7a&#8221;); } \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528 Objects.isNull() \u6216 Objects.nonNull() \u65b9\u6cd5\uff1a int[] arr = null; if (Objects.isNull(arr)) { System.out.println(&#8220;\u6570\u7ec4\u4e3a\u7a7a&#8221;); } else if [&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-38152","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38152","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=38152"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38152\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=38152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=38152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=38152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}