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Java example source code file (PeekingIterator.java)

This example Java source code file (PeekingIterator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

canignorereturnvalue, gwtcompatible, iterator, override, peekingiterator, util

The PeekingIterator.java Java example source code

/*
 * 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.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;

import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * An iterator that supports a one-element lookahead while iterating.
 *
 * <p>See the Guava User Guide article on  {
  /**
   * Returns the next element in the iteration, without advancing the iteration.
   *
   * <p>Calls to {@code peek()} should not change the state of the iteration,
   * except that it <i>may prevent removal of the most recent element via
   * {@link #remove()}.
   *
   * @throws NoSuchElementException if the iteration has no more elements
   *     according to {@link #hasNext()}
   */
  E peek();

  /**
   * {@inheritDoc}
   *
   * <p>The objects returned by consecutive calls to {@link #peek()} then {@link
   * #next()} are guaranteed to be equal to each other.
   */
  @CanIgnoreReturnValue
  @Override
  E next();

  /**
   * {@inheritDoc}
   *
   * <p>Implementations may or may not support removal when a call to {@link
   * #peek()} has occurred since the most recent call to {@link #next()}.
   *
   * @throws IllegalStateException if there has been a call to {@link #peek()}
   *     since the most recent call to {@link #next()} and this implementation
   *     does not support this sequence of calls (optional)
   */
  @Override
  void remove();
}
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