package com.hithomelabs.princeton1.module4; import java.util.Iterator; import javax.annotation.Nonnull; // Concrete implementation of stack using arrays // Creating a generic stack of type E public class ArrayStack extends Stack { @Override public boolean isEmpty() { return false; } @Override public void push(E element) { } @Override public E pop() { return null; } @Override public int size() { return 0; } @Override public Iterator iterator() { return null; } }