NullPointerException

Overview | Package | Class | Use | Tree | Deprecated | Index | Help

PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## java.lang
Class NullPointerException

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

All Implemented Interfaces:
  Serializable

    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
Version:
  1.16, 02/02/00
Author:
  unascribed
See Also:
  Serialized Form

Constructor Summary
`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 java.lang.Throwable
`fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### NullPointerException

    public NullPointerException()

  Constructs a `NullPointerException` with no detail message.

### NullPointerException

    public NullPointerException(String s)

  Constructs a `NullPointerException` with the specified detail message.

  Parameters:
    `s` - the detail message.

Overview | Package | Class | Use | Tree | Deprecated | Index | Help

PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD