Null (JBoss/Common API) - JBoss 4.0.1 sp1 common API Documentation 英文版文档

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org.jboss.util
Class Null

java.lang.Object
  org.jboss.util.Null

All Implemented Interfaces:: Serializable

public final class Null
extends Object
implements 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: 1.1 $
Author:: Jason Dillon
See Also:: Serialized Form

Field Summary

static Null VALUE
          The primary instance of Null.

Method Summary

boolean equals(Object obj)
          Check if the given object is a Null instance or null.

int hashCode()
          Returns zero.

String toString()
          Return a string representation.

Methods inherited from class java.lang.Object

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

Field Detail

VALUE

public static final Null VALUE

The primary instance of Null.

Method Detail

toString

public String toString()

Return a string representation.

Returns:: Null

hashCode

public int hashCode()

Returns zero.

Returns:: Zero.

equals

public boolean equals(Object obj)

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

Parameters:: obj - Object to test.
Returns:: True if the given object is a Null instance or null.