org.jboss.util

Class Null

java.lang.Object

org.jboss.util.Null

All Implemented Interfaces:

java.io.Serializable

public final class Null
extends java.lang.Object
implements java.io.Serializable

A class that represents null.

VALUE is used to given an object variable a dual-mode nullified value, where null would indicate that the value is empty, and VALUE would idicate that the value has been set to null (or something to that effect).

Version:

$Revision$

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private static long	serialVersionUID The serialVersionUID
static Null	VALUE The primary instance of Null.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	Null() Do not allow public construction.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj) Check if the given object is a Null instance or null.
int	hashCode() Returns zero.
java.lang.String	toString() Return a string representation.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

serialVersionUID

private static final long serialVersionUID

The serialVersionUID

See Also:

Constant Field Values

VALUE

public static final Null VALUE

The primary instance of Null.

Constructor Detail

Null

private Null()

Do not allow public construction.

Method Detail

toString

public java.lang.String toString()

Return a string representation.

Overrides:

toString in class java.lang.Object

Returns:

Null

hashCode

public int hashCode()

Returns zero.

Overrides:

hashCode in class java.lang.Object

Returns:

Zero.

equals

public boolean equals(java.lang.Object obj)

Check if the given object is a Null instance or null.

Overrides:

equals in class java.lang.Object

Parameters:

obj - Object to test.

Returns:

True if the given object is a Null instance or null.