package com.wrox.algorithms.iteration;/** * An {@link Iterator} that reverses the iteration direction of another. * */public class ReverseIterator implements Iterator {    /** The underlying iterator. */    private final Iterator _iterator;    /**     * Constructor.     *     * @param iterator The underlying iterator.     */    public ReverseIterator(Iterator iterator) {        assert iterator != null : "iterator can't be null";        _iterator = iterator;    }    public void first() {        _iterator.last();    }    public void last() {        _iterator.first();    }    public boolean isDone() {        return _iterator.isDone();    }    public void next() {        _iterator.previous();    }    public void previous() {        _iterator.next();    }    public Object current() throws IteratorOutOfBoundsException {        return _iterator.current();    }}