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

This runtime exception is thrown when an attempt is made to access a field or method of an instance or an element of an array when there is no instance or array to use (i.e. the pointer is null).

See Also:

Serialized Form

Constructor Summary

NullPointerException()
Constructs a new instance of this class with its walkback filled in.

NullPointerException(java.lang.String detailMessage)
Constructs a new instance of this class with its walkback and message filled in.

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

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NullPointerException

public NullPointerException()

Constructs a new instance of this class with its walkback filled in.

NullPointerException

public NullPointerException(java.lang.String detailMessage)

Constructs a new instance of this class with its walkback and message filled in.

Parameters:

detailMessage - String The detail message for the exception.