compact1, compact2, compact3
java.lang
Class NullPointerException
- java.lang.Object
-
- java.lang.Throwable
-
- java.lang.Exception
-
- java.lang.RuntimeException
-
- java.lang.NullPointerException
-
- All Implemented Interfaces:
- Serializable
public class NullPointerException extends RuntimeException
Thrown when an application attempts to usenullin a case where an object is required. These include:- Calling the instance method of a
nullobject. - Accessing or modifying the field of a
nullobject. - Taking the length of
nullas if it were an array. - Accessing or modifying the slots of
nullas if it were an array. - Throwing
nullas if it were aThrowablevalue.
Applications should throw instances of this class to indicate other illegal uses of the
nullobject.NullPointerExceptionobjects may be constructed by the virtual machine as if suppression were disabled and/or the stack trace was not writable.- Since:
- JDK1.0
- See Also:
- Serialized Form
-
-
Constructor Summary
Constructors Constructor and Description NullPointerException()Constructs aNullPointerExceptionwith no detail message.NullPointerException(String s)Constructs aNullPointerExceptionwith the specified detail message.
-
Method Summary
-
Methods inherited from class java.lang.Throwable
addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString
-
-
-
-
Constructor Detail
NullPointerException
public NullPointerException()
Constructs aNullPointerExceptionwith no detail message.
NullPointerException
public NullPointerException(String s)
Constructs aNullPointerExceptionwith the specified detail message.- Parameters:
-
s- the detail message.
-
Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2022, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
