Class ObjectUtils.Null

  extended by org.apache.commons.lang.ObjectUtils.Null
All Implemented Interfaces:
Enclosing class:

public static class ObjectUtils.Null
extends Object
implements Serializable

Class used as a null placeholder where null has another meaning.

For example, in a HashMap the HashMap.get(java.lang.Object) method returns null if the Map contains null or if there is no matching key. The Null placeholder can be used to distinguish between these two cases.

Another example is Hashtable, where null cannot be stored.

See Also:
Serialized Form

Method Summary
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Copyright © 2001-2011 The Apache Software Foundation. All Rights Reserved.