public class ContImpl<E> implements Cont<E> {
  private E e;
  public E get() { return e; }
  public void set(E e) { this.e = e; }
  public static void main(String args[]) {
    ContImpl<Integer> c = new ContImpl<Integer>();
    c.set(2);
    System.out.println(c.get());
  }
}