/**   @version 1.00 2004-05-10   @author Cay Horstmann*/public class Pair<T> {   public Pair() { first = null; second = null; }   public Pair(T first, T second) { this.first = first;  this.second = second; }   public T getFirst() { return first; }   public T getSecond() { return second; }   public void setFirst(T newValue) { first = newValue; }   public void setSecond(T newValue) { second = newValue; }   private T first;   private T second;}