org.apache.commons.lang
Class ObjectUtils.Null
java.lang.Objectorg.apache.commons.lang.ObjectUtils.Null
- ObjectUtils
- Serializable
public static class ObjectUtils.Null
extends java.lang.Object
implements Serializable
Class used as a null placeholder where
null
has another meaning.
For example, in a
HashMap the
java.util.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.