java.lang.Object
   java.lang.Throwable
      java.lang.Exception
         java.lang.RuntimeException
            java.lang.NullPointerException

All Implemented Interfaces:
    Serializable

• Calling the instance method of a {@code null} object.
• Accessing or modifying the field of a {@code null} object.
• Taking the length of {@code null} as if it were an array.
• Accessing or modifying the slots of {@code null} as if it were an array.
• Throwing {@code null} as if it were a {@code Throwable} value.

Applications should throw instances of this class to indicate other illegal uses of the {@code null} object. {@code NullPointerException} objects may be constructed by the virtual machine as if {@linkplain Throwable#Throwable(String, Throwable, boolean, boolean) suppression were disabled and/or the stack trace was not writable}.

author: unascribed -

since: JDK1.0 -

 public NullPointerException() 
{
        super();
}

 public NullPointerException(String s) 
{
        super(s);
}