{"id":36305,"date":"2024-11-26T08:14:56","date_gmt":"2024-11-26T00:14:56","guid":{"rendered":"https:\/\/fwq.ai\/blog\/36305\/"},"modified":"2024-11-26T08:14:56","modified_gmt":"2024-11-26T00:14:56","slug":"%e5%ae%89%e5%8d%93%e5%bc%80%e5%8f%91%e4%b8%ad%e5%a6%82%e4%bd%95%e9%81%bf%e5%85%8d-nullpointerexception-%e9%94%99%e8%af%af%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/36305\/","title":{"rendered":"\u5b89\u5353\u5f00\u53d1\u4e2d\u5982\u4f55\u907f\u514d NullPointerException \u9519\u8bef\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173106237389676.jpg\" class=\"aligncenter\" title=\"\u5b89\u5353\u5f00\u53d1\u4e2d\u5982\u4f55\u907f\u514d NullPointerException \u9519\u8bef\uff1f\u63d2\u56fe\" alt=\"\u5b89\u5353\u5f00\u53d1\u4e2d\u5982\u4f55\u907f\u514d NullPointerException \u9519\u8bef\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5b89\u5353\u5f00\u53d1\u4e2d null \u5f15\u53d1\u7684\u9519\u8bef<\/strong><\/p>\n<p>\u5728\u5b89\u5353\u5f00\u53d1\u4e2d\uff0cnullpointerexception \u662f\u4e00\u79cd\u5e38\u89c1\u7684\u9519\u8bef\uff0c\u5b83\u53d1\u751f\u5728\u4ee3\u7801\u8bd5\u56fe\u8bbf\u95ee\u672a\u7ecf\u521d\u59cb\u5316\u6216\u4e3a null \u7684\u5bf9\u8c61\u65f6\u3002<\/p>\n<p>\u95ee\u9898\u63cf\u8ff0\uff1a<\/p>\n<pre>public static byte[] setgaszero3 = null;\nif (mainactivity.setgaszero3 != null || mainactivity.setgaszero3.length != 0)<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u7b2c\u4e8c\u884c\u4ee3\u7801\u4e2d\uff0c\u5f53 mnactivity.setgaszero3 \u4e3a null \u65f6\u4f1a\u5f15\u53d1\u9519\u8bef\u3002\u9519\u8bef\u63d0\u793a\u4e3a\u201c\u6e90\u7801\u4e0e\u5b57\u8282\u7801\u4e0d\u5339\u914d\u201d\u3002<\/p>\n<p>\u89e3\u51b3\u65b9\u6848\uff1a<\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a nullpointerexception \u9519\u8bef\u3002\u89e3\u51b3\u529e\u6cd5\u662f\u5224\u65ad mainactivity.setgaszero3 \u662f\u5426\u4e3a null\uff0c\u5982\u679c\u4e3a null\uff0c\u5219\u8fd4\u56de\u6216\u8fdb\u884c\u5176\u4ed6\u5904\u7406\uff0c\u907f\u514d\u8bbf\u95ee\u5b83\u7684\u957f\u5ea6\u3002<\/p>\n<p>\u66f4\u6b63\u540e\u7684\u4ee3\u7801\uff1a<\/p>\n<pre>if (MainActivity.setGaszero3 != null &amp;&amp; MainActivity.setGaszero3.length != 0)<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5b89\u5353\u5f00\u53d1\u4e2d\u5982\u4f55\u907f\u514d NullPointerException \u9519\u8bef\uff1f\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>\u5b89\u5353\u5f00\u53d1\u4e2d null \u5f15\u53d1\u7684\u9519\u8bef \u5728\u5b89\u5353\u5f00\u53d1\u4e2d\uff0cnullpointerexception \u662f\u4e00\u79cd\u5e38\u89c1\u7684\u9519\u8bef\uff0c\u5b83\u53d1\u751f\u5728\u4ee3\u7801\u8bd5\u56fe\u8bbf\u95ee\u672a\u7ecf\u521d\u59cb\u5316\u6216\u4e3a null \u7684\u5bf9\u8c61\u65f6\u3002 \u95ee\u9898\u63cf\u8ff0\uff1a public static byte[] setgaszero3 = null; if (mainactivity.setgaszero3 != null || mainactivity.setgaszero3.length != 0) \u767b\u5f55\u540e\u590d\u5236 \u5728\u7b2c\u4e8c\u884c\u4ee3\u7801\u4e2d\uff0c\u5f53 mnactivity.setgaszero3 \u4e3a null \u65f6\u4f1a\u5f15\u53d1\u9519\u8bef\u3002\u9519\u8bef\u63d0\u793a\u4e3a\u201c\u6e90\u7801\u4e0e\u5b57\u8282\u7801\u4e0d\u5339\u914d\u201d\u3002 \u89e3\u51b3\u65b9\u6848\uff1a \u8fd9\u662f\u4e00\u4e2a nullpointerexception \u9519\u8bef\u3002\u89e3\u51b3\u529e\u6cd5\u662f\u5224\u65ad mainactivity.setgaszero3 \u662f\u5426\u4e3a null\uff0c\u5982\u679c\u4e3a null\uff0c\u5219\u8fd4\u56de\u6216\u8fdb\u884c\u5176\u4ed6\u5904\u7406\uff0c\u907f\u514d\u8bbf\u95ee\u5b83\u7684\u957f\u5ea6\u3002 \u66f4\u6b63\u540e\u7684\u4ee3\u7801\uff1a if (MainActivity.setGaszero3 != null &amp;&amp; MainActivity.setGaszero3.length != 0) \u767b\u5f55\u540e\u590d\u5236 \u4ee5\u4e0a\u5c31\u662f\u5b89\u5353\u5f00\u53d1\u4e2d\u5982\u4f55\u907f\u514d NullPointerException \u9519\u8bef\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/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-36305","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/36305","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=36305"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/36305\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=36305"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=36305"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=36305"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}