Computer Science Technology Wikipedia

package foo;

import java.util.Iterator;

/**
 * the fibonacci series implemented as an Iterable.
 */
public final class Fibonacci implements Iterable {
  /** the next and previous members of the series. */
  private int a = 1, b = 1;

  @Override
  public Iterator iterator() {
    return new Iterator() {
      /** the series is infinite. */
      public boolean hasNext() { return true; }
      public Integer next() {
        int tmp = a;
        a += b;
        b = tmp;
        return a;
      }
      public void remove() { throw new UnsupportedOperationException(); }
    };
  }

  /**
   * the nth element of the given series.
   * @throws NoSuchElementException if there are less than n elements in the
   *   given Iterable's {@link Iterable#iterator iterator}.
   */
  public static 
  T nth(int n, Iterable iterable) {
    Iterator it = iterable.iterator();
    while (--n > 0) {
      it.next();
    }
    return it.next();
  }

  public static void main(String[] args) {
    System.out.print(nth(10, new Fibonacci()));
  }
}

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