Documentation  › java.lang  › NullPointerException
 
 


  NullPointerException
  public

  Inherits From:   RuntimeException : Exception : Throwable : Object
  Conforms To:   none
  Declared In:   java.lang


Exception Description
 
Thrown when an application attempts to use null in a case where an object is required. These include:
  • Calling the instance method of a null object.
  • Accessing or modifying the field of a null object.
  • Taking the length of null as if it were an array.
  • Accessing or modifying the slots of null as if it were an array.
  • Throwing null as if it were a Throwable value.

Applications should throw instances of this class to indicate other illegal uses of the null object.



Class Variables
 
None declared in this exception.


Instance Variables
 
None declared in this exception.


Constructors
 
NullPointerException
public NullPointerException( )

Constructs a NullPointerException with no detail message.


NullPointerException
public NullPointerException( String s )

Constructs a NullPointerException with the specified detail message.


Class Methods
 
None declared in this exception.


Instance Methods
 
None declared in this exception.


Known Subclasses
 
None.



 
 
  dydoc
  3/10/05