class LinkedList<T, E>{
    T t;
    E e;
    T get(){return t;}
    void set(E t){}
}

class ListLinked<T, E> extends LinkedList<E, T>{
}

class Test{

   void f (){
      ListLinked x = new ListLinked();
      LinkedList y = x;

      Integer i = (Integer) x.get();
      x.set("");
      y.set(new Integer(2));
   }
}