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Enumeration.java
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1997-08-30
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/*
* @(#)Enumeration.java 1.11 97/01/28
*
* Copyright (c) 1995, 1996 Sun Microsystems, Inc. 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.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
* CopyrightVersion 1.1_beta
*
*/
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 1.11, 01/28/97
* @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();
}