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0N/A
0N/Apackage java.util;
0N/A
0N/A/**
0N/A * An iterator over a collection. {@code Iterator} takes the place of
0N/A * {@link Enumeration} in the Java Collections Framework. Iterators
0N/A * differ from enumerations in two ways:
0N/A *
0N/A * <ul>
0N/A * <li> Iterators allow the caller to remove elements from the
0N/A * underlying collection during the iteration with well-defined
0N/A * semantics.
0N/A * <li> Method names have been improved.
0N/A * </ul>
0N/A *
0N/A * <p>This interface is a member of the
0N/A * <a href="{@docRoot}/../technotes/guides/collections/index.html">
0N/A * Java Collections Framework</a>.
0N/A *
2189N/A * @param <E> the type of elements returned by this iterator
2189N/A *
0N/A * @author Josh Bloch
0N/A * @see Collection
0N/A * @see ListIterator
0N/A * @see Iterable
0N/A * @since 1.2
0N/A */
0N/Apublic interface Iterator<E> {
0N/A /**
0N/A * Returns {@code true} if the iteration has more elements.
0N/A * (In other words, returns {@code true} if {@link #next} would
0N/A * return an element rather than throwing an exception.)
0N/A *
0N/A * @return {@code true} if the iteration has more elements
0N/A */
0N/A boolean hasNext();
0N/A
0N/A /**
0N/A * Returns the next element in the iteration.
0N/A *
0N/A * @return the next element in the iteration
0N/A * @throws NoSuchElementException if the iteration has no more elements
0N/A */
0N/A E next();
0N/A
0N/A /**
0N/A * Removes from the underlying collection the last element returned
0N/A * by this iterator (optional operation). This method can be called
0N/A * only once per call to {@link #next}. The behavior of an iterator
0N/A * is unspecified if the underlying collection is modified while the
0N/A * iteration is in progress in any way other than by calling this
0N/A * method.
0N/A *
0N/A * @throws UnsupportedOperationException if the {@code remove}
0N/A * operation is not supported by this iterator
0N/A *
0N/A * @throws IllegalStateException if the {@code next} method has not
0N/A * yet been called, or the {@code remove} method has already
0N/A * been called after the last call to the {@code next}
0N/A * method
0N/A */
0N/A void remove();
0N/A}