EmptyEnumeration

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gnu.java.util
Class EmptyEnumeration

java.lang.Object
  gnu.java.util.EmptyEnumeration

All Implemented Interfaces:: java.util.Enumeration, java.io.Serializable

public final class EmptyEnumeration
extends java.lang.Object
implements java.util.Enumeration, java.io.Serializable

This is a helper class that produces an empty Enumerations. There is only one instance of this class that can be used whenever one needs a non-null but empty enumeration. Using this class prevents multiple small objects and inner classes. getInstance() returns the only instance of this class. It can be shared by multiple objects and threads.

Field Summary

private static EmptyEnumeration instance
          The only instance of this class

Constructor Summary

private EmptyEnumeration()
          Private constructor that creates a new empty Enumeration.

Method Summary

static EmptyEnumeration getInstance()
          Returns the only instance of this class.

boolean hasMoreElements()
          Returns false, since there are no elements.

java.lang.Object nextElement()
          Always throws NoSuchElementException, since it is empty.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

instance

private static final EmptyEnumeration instance

The only instance of this class

Constructor Detail