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  * Copyright (C) 2008 The Guava Authors
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
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 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
An iterator that supports a one-element lookahead while iterating.

See the Guava User Guide article on PeekingIterator.

Mick Killianey
2.0 (imported from Google Collections Library)
public interface PeekingIterator<E> extends Iterator<E> {
Returns the next element in the iteration, without advancing the iteration.

Calls to peek() should not change the state of the iteration, except that it may prevent removal of the most recent element via remove().

java.util.NoSuchElementException if the iteration has no more elements according to java.util.Iterator.hasNext()
  E peek();


The objects returned by consecutive calls to peek() then next() are guaranteed to be equal to each other.

  E next();


Implementations may or may not support removal when a call to peek() has occurred since the most recent call to next().

java.lang.IllegalStateException if there has been a call to peek() since the most recent call to next() and this implementation does not support this sequence of calls (optional)
  void remove();
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