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 a program tries to access a field or method of an object or an element of an array when there is no instance or array to use, that is if the object or array points to null. It also occurs in some other, less obvious circumstances, like a throw e statement where the Throwable reference is null.

See Also:

Serialized Form

Constructor Summary

NullPointerException()
Constructs a new NullPointerException that includes the current stack trace.

NullPointerException(String detailMessage)
Constructs a new NullPointerException with the current stack trace and the specified detail message.

Method Summary

Methods inherited from class java.lang.Throwable

fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NullPointerException

public NullPointerException()

Constructs a new NullPointerException that includes the current stack trace.

NullPointerException

public NullPointerException(String detailMessage)

Constructs a new NullPointerException with the current stack trace and the specified detail message.

Parameters:

detailMessage - the detail message for this exception.