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  * Copyright (C) 2010 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
 * 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.
This class provides a skeletal implementation of the Iterator interface for sequences whose next element can always be derived from the previous element. Null elements are not supported, nor is the UnmodifiableIterator.remove() method.


   Iterator<Integer> powersOfTwo = 
       new AbstractSequentialIterator<Integer>(1) {
         protected Integer computeNext(Integer previous) {
           return (previous == 1 << 30) ? null : previous * 2;

Chris Povirk
12.0 (in Guava as AbstractLinkedIterator since 8.0)
public abstract class AbstractSequentialIterator<T>
    extends UnmodifiableIterator<T> {
  private T nextOrNull;

Creates a new iterator with the given first element, or, if firstOrNull is null, creates a new empty iterator.
  protected AbstractSequentialIterator(@Nullable T firstOrNull) {
    this. = firstOrNull;

Returns the element that follows previous, or returns null if no elements remain. This method is invoked during each call to next() in order to compute the result of a future call to next().
  protected abstract T computeNext(T previous);
  public final boolean hasNext() {
    return  != null;
  public final T next() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    try {
      return ;
    } finally {
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