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 *  Licensed to the Apache Software Foundation (ASF) under one or more
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 *  the License.  You may obtain a copy of the License at
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 *     http://www.apache.org/licenses/LICENSE-2.0
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package java.util;

/**
 * An iterator over a sequence of objects, such as a collection.
 *
 * 

If a collection has been changed since the iterator was created, * methods {@code next} and {@code hasNext()} may throw a {@code ConcurrentModificationException}. * It is not possible to guarantee that this mechanism works in all cases of unsynchronized * concurrent modification. It should only be used for debugging purposes. Iterators with this * behavior are called fail-fast iterators. * *

Implementing {@link Iterable} and returning an {@code Iterator} allows your * class to be used as a collection with the enhanced for loop. * * @param * the type of object returned by the iterator. */ public interface Iterator { /** * Returns true if there is at least one more element, false otherwise. * @see #next */ public boolean hasNext(); /** * Returns the next object and advances the iterator. * * @return the next object. * @throws NoSuchElementException * if there are no more elements. * @see #hasNext */ public E next(); /** * Removes the last object returned by {@code next} from the collection. * This method can only be called once between each call to {@code next}. * * @throws UnsupportedOperationException * if removing is not supported by the collection being * iterated. * @throws IllegalStateException * if {@code next} has not been called, or {@code remove} has * already been called after the last call to {@code next}. */ public void remove(); }





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