Package org.apache.commons.lang3

Class ObjectUtils.Null

  • All Implemented Interfaces:
    java.io.Serializable
    Enclosing class:
    ObjectUtils
    public static class ObjectUtils.Null
extends java.lang.Object
implements java.io.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