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The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.collections4;

import java.util.Iterator;

/**
 * Defines an iterator that operates over an ordered container. Subset of {@link java.util.ListIterator}.
 * 
 * This iterator allows both forward and reverse iteration through the container.
 *
 * @param  the type to iterate over
 * @since 3.0
 */
public interface OrderedIterator extends Iterator {

    /**
     * Checks to see if there is a previous element that can be iterated to.
     *
     * @return true if the iterator has a previous element
     */
    boolean hasPrevious();

    /**
     * Gets the previous element from the container.
     *
     * @return the previous element in the iteration
     * @throws java.util.NoSuchElementException if the iteration is finished
     */
    E previous();

}