java.lang Class NullPointerException

java.lang
Class NullPointerException

java.lang.Object


  java.lang.Throwable


      java.lang.Exception


          java.lang.RuntimeException


              java.lang.NullPointerException

All Implemented Interfaces:

Serializable

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public class NullPointerException

extends RuntimeException

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.