public interface WaitingArrayInterface<T>{
  public void add(T t);
  public void remove() throws EmptyWaitingArrayException;
  public void clear() throws EmptyWaitingArrayException;
  public T getFirst() throws EmptyWaitingArrayException;
  public T getLast() throws EmptyWaitingArrayException;
  public boolean isEmpty();
  public boolean isFull();
  public String toString();
}