//ProjectThreeStack behaves exactly as DropoutStack, except it
//automatically doubles in size whenever it becomes full,
//thus never discarding any old elements when new are added
public class ProjectThreeStack<T> extends DropoutStack<T> {
	
	public void push (T element){
		//if full, double in size, then push as usual
		if(isFull())
			resize(size()*2);
		super.push(element);
	}
}