Quelle est la sortie de ce programme (Pile générique)?

import java.util.Stack;
class Pilegeneric <E>
{
    Stack <E> pile = new Stack <E>();
    public void push(E obj)
    {
         pile.push(obj);
    }
    public E pop()
    {
         E obj = pile.pop();
         return obj;
    }
}
public class Test
{
    public static void main(String args[])
    {
         PileGeneric <String> p1 = new PileGeneric <>();
         p1.push("Hello");
         System.out.print(p1.pop() + " ");
         PileGeneric <Integer> p2  = new PileGeneric <>();
         p2.push("44");
         System.out.println(p2.pop());
     }
}