Cloning issue

[Paul Richards]

The clone method in OrderedCloneablePair does not work since the clone method on the members e1 and e2 is returning an Object. Why does it not return a member of class E?

public class CloneablePair<E extends ReallyCloneable> {
    private E e1,e2;

    public CloneablePair(E e1, E e2) {
        this.e1 = e1;
        this.e2 = e2;
    }

    public CloneablePair clone() {
        return new CloneablePair(e1.clone(), e2.clone());
    }
}

public interface ReallyCloneable<X> {
     public X clone();
}

[mrmatt1111]

Because you didn't tell it what class is ReallyCloneable?

public class CloneablePair<E extends ReallyCloneable<E>>
{
   private E e1,e2;

   public CloneablePair(E e1, E e2) 
   {
      this.e1 = e1;
      this.e2 = e2;
   }

   public CloneablePair<E> clone() {
      return new CloneablePair(e1.clone(), e2.clone());
   }
}

public interface ReallyCloneable<X> {
     public X clone();
}

[Paul Richards]

That workded, well done mrmatt1111, thanks.