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   * Copyright (c) 1994, 2005, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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   */
  
  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 <tt>Vector&lt;E&gt;</tt> <i>v</i>:
   * <pre>
   *   for (Enumeration&lt;E&gt; e = v.elements(); e.hasMoreElements();)
   *       System.out.println(e.nextElement());</pre>
   * <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>.
   * <p>
   * 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.
   *
   * @see     Iterator
   * @see     java.io.SequenceInputStream
   * @see     Enumeration#nextElement()
   * @see     Hashtable
   * @see     Hashtable#elements()
   * @see     Hashtable#keys()
   * @see     Vector
   * @see     Vector#elements()
   *
   * @author  Lee Boynton
   * @since   JDK1.0
   */
  public interface Enumeration<E> {
      /**
       * Tests if this enumeration contains more elements.
       *
       * @return  <code>true</code> if and only if this enumeration object
       *           contains at least one more element to provide;
       *          <code>false</code> otherwise.
       */
      boolean hasMoreElements();
  
      /**
       * Returns the next element of this enumeration if this enumeration
       * object has at least one more element to provide.
       *
       * @return     the next element of this enumeration.
       * @exception  NoSuchElementException  if no more elements exist.
       */
      E nextElement();
  }
  