All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class java.lang.NullPointerException

java.lang.Object
|
   +----java.lang.Throwable
|
           +----java.lang.Exception
|
                   +----java.lang.RuntimeException
|
                           +----java.lang.NullPointerException

public class NullPointerException

extends RuntimeException

• 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.

NullPointerException()

Constructs a NullPointerException with no detail message.

NullPointerException(String)

Constructs a NullPointerException with the specified detail message.

public NullPointerException()

Constructs a NullPointerException with no detail message.

public NullPointerException(String s)

Constructs a NullPointerException with the specified detail message.

Parameters:

s - the detail message.

All Packages  Class Hierarchy  This Package  Previous  Next  Index