NullPointerException应该是 Java 开发中最常出现的问题,也是 Java 程序员最容易犯的错误。虽然看起来是个小错误,但带来的影响却不小,Tony Hoare(null 引用的发明者)在 2009 年说过 NPE 大约给企业造成数十亿美元的损失。在这工作半年内,我就踩了好几次 NPE 的坑。举个例子,我需要在原有逻辑上加一段代码,而...
Exceptionin thread"main"java.lang.NullPointerException:Cannot invoke"RegistryAddress.getCity()"because thereturnvalueof"com.developlee.java14.helpfulnullpointerexceptions.HelpfulNullPointerException$DetailInfos.getRegistryAddress()"isnull at com.developlee.java14.helpfulnullpointerexceptions.HelpfulNullPointer...
Integer i = null; int x = i; // runtime error 虽然当该代码运行时会报出NullPointerException的错误。 成员方法调用 null 是够糟糕的;当你从未见过该方法被调用时更糟糕。 6. NULL 难以调试 来解释 NULL 是多么的麻烦,C++ 是一个很好的例子。调用成员函数指向一个 NULL 指针不一定会导致程序崩溃。更糟...
结果如下: Exception in thread"main"java.lang.NullPointerException at test.Test.main(Test.java:12)
问条目值为空的Collectors.toMap中的NullPointerExceptionEN我写了一个Collector，与默认的java不同，当你...
HTTP Status 500 -Request processing failed; nested exception is java.lang.NullPointerException type Exception report message Request processing failed; nested exception is java.lang.NullPointerException description The server encountered an internal error that prevented it from fulfillingthisrequest. ...
用cocoside 保存project.json出现 Save Failed java.lang.NullPointerExceptionjy00885876 (jy00885876) 2016年04月13日 07:23 #2 求助啊 superdragon (superdragon) 2016年04月13日 07:23 #3 你好,是什么情况下出现的呢。使用cocos code ide编辑project.json文件,点击保存以后,报错么?然后文件是否保存成功,...
NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress' Describe the bug I am getting this crash infile_picker: 03-06 23:31:01.715 1461 1733 W MediaProvider: isAppCloneUserPair for user 0: false03-06 23:31:01.717 1461 1733 V MediaProvider: Inserted...
Version 1.82b: --- - NULL pointer in is_javascript() fixed. Version 1.81b: ---2 changes: 1 addition & 1 deletion 2 Makefile Original file line numberDiff line numberDiff line change @@ -20,7 +20,7 @@ # PROGNAME = skipfish VERSION = 1.81b VERSION = 1.82b OBJFILES = http_...
In Java, theNullPointerExceptionis the only exception that has deserved its own acronym: NPE. If you tell a Java programmer something like "This code is full of NPEs", he/she knows exactly what you are talking about. nullhas been the cause of: ...