public   class  A<T  extends  Cloneable<T>> {
     private  T o;

     public  A(T t) {
        o = t;
    }

     public  T foo() {
         return  o.clone();
    }

     public   static   void  main(String[] args) {
        A<Y> a =  new  A<Y>( new  Y());
        Y y = a.foo();
        System.out.println("y: " + y);
    }

}

 interface  Cloneable<T>  extends  java.lang.Cloneable {
    T clone();
}

 class  Y  implements  Cloneable<Y> {
     public  Y clone() {
         try  {
             return  (Y)  super .clone();
        }  catch  (CloneNotSupportedException e) {
             throw   new  RuntimeException(e);
        }
    }
}