No I know enough to know that java.lang.NullPointerException means that a variable is empty but being used as not empty. And after looking back at my code, it should never be empty and I cannot reproduce it. So here is my code, can anyone figure out what is wrong? And please rememb...
this means the call togetUSB()will try to return the USB port of a null reference, which will result in aNullPointerExceptionat runtime and stop your program from running further. Imagine if your program was running on a customer's machine; what would your customer...
NullPointerExceptionis a runtime condition where we try to access or modify an object which has not been initialized yet. It essentially means that the object’s reference variable is not pointing anywhere and refers to nothing or ‘null’. In the given example, Stringshas been declared but n...
If you use an IDE such as eclipse, set a breakpoint on a NullPointerException. Then when you debug examine the local variables at that point to work out what is null. It seems most likely from this code that getSomeBtn() is returning null which means your B class is not initializing ...
【单选题】NullPointerException的父类是 A. Throwable B. Error C. RuntimeException D. Exception 查看完整题目与答案 【单选题】Applet类的直接父类是( )。 A. Component类 B. Container类 C. Frame类 D. Panel类 查看完整题目与答案 【单选题】在Swing中,JButton的直接父类是 ( ) ...
"getModel" and "createStatement" Because if you're getting a null pointer exception, that means you're using an object reference that doesn't actually refer to an object, but to a null pointer reference. In the snippet you provided, only these functions are returning an object so maybe ...
Platform: Desktop Version: 4.6.18-patch1 (Build 876) Rulesets: [Civ V - Gods & Kings, UnCiv-Great-Farmer, Civ V - Vanilla, UnCiv-Logicians] Last Screen: com.unciv.ui.screens.worldscreen.WorldScreen OS: Linux (amd64, 6.1.0-1parrot1-amd64)...
[java] java.lang.NullPointerException [java] At edu.umd.cs.findbugs.visitclass.DismantleBytecode.visit(DismantleBytecode.java:719) [java] At edu.umd.cs.findbugs.detect.FieldItemSummary.visit(FieldItemSummary.java:131) [java] At edu.umd.cs.findbugs.visitclass.BetterVisitor.visitCode(Better...
3. Understanding What a null Exception Message Indicates Usually, when we see a null exception message in Java, it typically means the exception was thrown without a message. For example, a NullPointerException() was thrown when the application ran with JDK earlier than JDK14. If we look at...
无效java.lang .NullpointerException 翻译结果3复制译文编辑译文朗读译文返回顶部 java.lang,则为 null。空指针异常 翻译结果4复制译文编辑译文朗读译文返回顶部 空java.lang .NullpointerException 翻译结果5复制译文编辑译文朗读译文返回顶部 空java.lang .NullpointerException ...