?? reverseiterator.java
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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(); }}
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