Java tutorial
/* * Copyright 2001-2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.collections; /** * Defines an iterator that operates over an ordered <code>Map</code>. * <p> * This iterator allows both forward and reverse iteration through the map. * * @since Commons Collections 3.0 * @version $Revision: 1.4 $ $Date: 2004/02/18 01:15:42 $ * * @author Stephen Colebourne */ public interface OrderedMapIterator extends MapIterator, OrderedIterator { /** * Checks to see if there is a previous entry that can be iterated to. * * @return <code>true</code> if the iterator has a previous element */ boolean hasPrevious(); /** * Gets the previous <em>key</em> from the <code>Map</code>. * * @return the previous key in the iteration * @throws java.util.NoSuchElementException if the iteration is finished */ Object previous(); }