Interface: java.util.Enumeration<E>

  • public interface Enumeration<E>
An object that implements the Enumeration interface generates a series of elements, one at a time. Successive calls to the nextElement method return successive elements of the series.

For example, to print all elements of a Vector<E> v: 

   for (Enumeration<E> e = v.elements(); e.hasMoreElements();)
       System.out.println(e.nextElement());

Methods are provided to enumerate through the elements of a vector, the keys of a hashtable, and the values in a hashtable. Enumerations are also used to specify the input streams to a SequenceInputStream.

NOTE: The functionality of this interface is duplicated by the Iterator interface. In addition, Iterator adds an optional remove operation, and has shorter method names. New implementations should consider using Iterator in preference to Enumeration.

Authors:
@author Lee Boynton
See:
@see java.util.Iterator
@see java.io.SequenceInputStream
@see java.util.Enumeration.nextElement()
@see java.util.Hashtable
@see java.util.Hashtable.elements()
@see java.util.Hashtable.keys()
@see java.util.Vector
@see java.util.Vector.elements()
Since:
@since JDK1.0

Methods

  • hasMoreElementstop

    public boolean hasMoreElements()
    Tests if this enumeration contains more elements.
    Return:
    @return true if and only if this enumeration object contains at least one more element to provide; false otherwise.
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  • nextElementtop

    public E nextElement()
    Returns the next element of this enumeration if this enumeration object has at least one more element to provide.
    Return:
    @return the next element of this enumeration.
    Exceptions:
    @exception NoSuchElementException if no more elements exist.
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