//Title: Singly-Linked List Implementation
//Version:      Iterator.java,v 1.3 2002/11/26 10:47:52 pbj Exp
//Copyright:    Copyright (c) 2002
//Author:       Paul Jackson
//Organisation: School of Informatics, University of Edinburgh

public class Iterator {
  protected SLink linkToRight;

  // Constructor
  protected Iterator(SLink link) { linkToRight = link; }

  // Iterator methods  

  public boolean hasNext() { return linkToRight != null; }

  public Object next() {
    if (hasNext()) {
      Object result = linkToRight.element;
      linkToRight = linkToRight.nextLink;
      return result;
    }
    else
      return null;
  }
}