org.apache.commons.lang
Class ObjectUtils.Null
- ObjectUtils
- Serializable
public static class ObjectUtils.Null
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.
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