Exception: java.lang.NullPointerException

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.

Authors:
@author unascribed
Since:
@since JDK1.0

Inheritance

Superclass tree: Implements:

Methods

  • NullPointerExceptiontop

    public NullPointerException()
    Constructs a NullPointerException with no detail message.
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  • NullPointerExceptiontop

    public NullPointerException(String s)
    Constructs a NullPointerException with the specified detail message.
    Parameters:
    @param s the detail message.
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