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

Untamed: 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:

1.17, 12/03/01

Author:

unascribed

See Also:

Serialized Form

NullPointerException

public NullPointerException()

Enabled: Constructs a NullPointerException with no detail message.

NullPointerException

public NullPointerException(String s)

Enabled: Constructs a NullPointerException with the specified detail message.

Parameters:

s - the detail message.