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Enumeration.java
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1998-09-22
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/*
* @(#)Enumeration.java 1.12 98/07/01
*
* Copyright 1995-1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
package java.util;
/**
* An object that implements the Enumeration interface generates a
* series of elements, one at a time. Successive calls to the
* <code>nextElement</code> method return successive elements of the
* series.
* <p>
* For example, to print all elements of a vector <i>v</i>:
* <blockquote><pre>
* for (Enumeration e = v.elements() ; e.hasMoreElements() ;) {
* System.out.println(e.nextElement());<br>
* }
* </pre></blockquote>
* <p>
* 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
* <code>SequenceInputStream</code>.
*
* @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()
*
* @author Lee Boynton
* @version 1.12, 07/01/98
* @since JDK1.0
*/
public interface Enumeration {
/**
* Tests if this enumeration contains more elements.
*
* @return <code>true</code> if this enumeration contains more elements;
* <code>false</code> otherwise.
* @since JDK1.0
*/
boolean hasMoreElements();
/**
* Returns the next element of this enumeration.
*
* @return the next element of this enumeration.
* @exception NoSuchElementException if no more elements exist.
* @since JDK1.0
*/
Object nextElement();
}