import java.util.Stack;

public class StackStack <E> implements StackADT<E> {
	//instance variables
	protected Stack <E> S;
	protected int stackSize = 0;

	public StackStack() {
		S = new Stack <E>();
	}
	public boolean isEmpty() {
		return S.empty();
	}
	@Override
	public void push(E element) {
		// TODO Auto-generated method stub
		S.add(0, element);

	}
	@Override
	public E pop() throws EmptyStackException {
		// TODO Auto-generated method stub
		if (S.isEmpty()==true){
		throw new EmptyStackException("This Stack is empty");
		}
		else {
		stackSize= stackSize -1;
		return S.pop();
		}
	}
	@Override
	public E top() throws EmptyStackException {
		// TODO Auto-generated method stub
		if (S.isEmpty()==true) {
			throw new EmptyStackException("This Stack is empty");
		}
		else {
		return S.peek();
		}
	}
	@Override
	public int size() {
		// TODO Auto-generated method stub
		return S.size();
	}
}