@Override
public E top() throws EmptyStackException {
if (isEmpty()) {
throw new EmptyStackException("Stack is empty!");
}
return top.getElement();
}
@Override
public E pop() throws EmptyStackException {
if (isEmpty()) {
throw new EmptyStackException("Stack is empty");
}
E element = top.getElement();
top = top.getNext();
size--;
return element;
}