Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| MID Profile
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: INNER | 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

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

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

Methods inherited from class java.lang.Throwable
`getMessage, printStackTrace, 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
| MID Profile
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Submit a comment or suggestion Version 0.95 of MID Profile Specification
Java is a trademark or registered trademark of Sun Microsystems, Inc. in the US and other countries. Copyright 1993-2000 Sun Microsystems, Inc. 901 San Antonio Road,Palo Alto, California, 94303, U.S.A. All Rights Reserved.