# Class NullPointerException

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

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. Since: JDK1.0, CLDC 1.0

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `NullPointerException()`
  Constructs a NullPointerException with no detail message.
  `NullPointerException(String s)`
  Constructs a NullPointerException with the specified detail message.

- ## Method Summary

  ### Methods inherited from class Throwable

  `addSuppressed, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, setStackTrace, toString`

  ### Methods inherited from class Object

  `clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- ## Constructor Details

  - ### NullPointerException

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

  - ### NullPointerException

    public NullPointerException(String s)
    Constructs a NullPointerException with the specified detail message. s - the detail message.