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| 1 | /* | ||
| 2 | * Copyright (c) 1994, 2005, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.util; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * An object that implements the Enumeration interface generates a | ||
| 30 | * series of elements, one at a time. Successive calls to the | ||
| 31 | * <code>nextElement</code> method return successive elements of the | ||
| 32 | * series. | ||
| 33 | * <p> | ||
| 34 | * For example, to print all elements of a <tt>Vector<E></tt> <i>v</i>: | ||
| 35 | * <pre> | ||
| 36 | * for (Enumeration<E> e = v.elements(); e.hasMoreElements();) | ||
| 37 | * System.out.println(e.nextElement());</pre> | ||
| 38 | * <p> | ||
| 39 | * Methods are provided to enumerate through the elements of a | ||
| 40 | * vector, the keys of a hashtable, and the values in a hashtable. | ||
| 41 | * Enumerations are also used to specify the input streams to a | ||
| 42 | * <code>SequenceInputStream</code>. | ||
| 43 | * <p> | ||
| 44 | * NOTE: The functionality of this interface is duplicated by the Iterator | ||
| 45 | * interface. In addition, Iterator adds an optional remove operation, and | ||
| 46 | * has shorter method names. New implementations should consider using | ||
| 47 | * Iterator in preference to Enumeration. | ||
| 48 | * | ||
| 49 | * @see java.util.Iterator | ||
| 50 | * @see java.io.SequenceInputStream | ||
| 51 | * @see java.util.Enumeration#nextElement() | ||
| 52 | * @see java.util.Hashtable | ||
| 53 | * @see java.util.Hashtable#elements() | ||
| 54 | * @see java.util.Hashtable#keys() | ||
| 55 | * @see java.util.Vector | ||
| 56 | * @see java.util.Vector#elements() | ||
| 57 | * | ||
| 58 | * @author Lee Boynton | ||
| 59 | * @since JDK1.0 | ||
| 60 | */ | ||
| 61 | public interface Enumeration<E> { | ||
| 62 | /** | ||
| 63 | * Tests if this enumeration contains more elements. | ||
| 64 | * | ||
| 65 | * @return <code>true</code> if and only if this enumeration object | ||
| 66 | * contains at least one more element to provide; | ||
| 67 | * <code>false</code> otherwise. | ||
| 68 | */ | ||
| 69 | boolean hasMoreElements(); | ||
| 70 | |||
| 71 | /** | ||
| 72 | * Returns the next element of this enumeration if this enumeration | ||
| 73 | * object has at least one more element to provide. | ||
| 74 | * | ||
| 75 | * @return the next element of this enumeration. | ||
| 76 | * @exception NoSuchElementException if no more elements exist. | ||
| 77 | */ | ||
| 78 | E nextElement(); | ||
| 79 | } | ||