MyStack

/**
 * custom implementation of a stack using Dr. Kuperman's interface
 */

import java.util.ArrayList;
import java.util.Iterator;
import java.util.NoSuchElementException;

public class MyStack<T> implements StackADT<T>, Iterable<Square>
{
    //field
    private ArrayList<T> data;




    /**
     * constructor
     */
    public MyStack()
    {
        data = new ArrayList<T>();
    }




    @Override
    public void push(T item)
    {
        data.add(data.size(), item); //add past the current data
    }




    @Override
    public T pop() throws NoSuchElementException
    {
        if (this.isEmpty())
            throw new NoSuchElementException("Stack is empty");
        return data.remove(data.size() - 1);
    }




    @Override
    public T top() throws NoSuchElementException
    {
        if (this.isEmpty())
            throw new NoSuchElementException("Stack is empty");
        return data.get(data.size() - 1);
    }




    @Override
    public int size()
    {
        return data.size();
    }




    @Override
    public boolean isEmpty()
    {
        return data.size() == 0;
    }




    @Override
    public void clear()
    {
        data.removeAll(data);
    }




    @Override
    public Iterator<Square> iterator()
    {
        // TODO Auto-generated method stub
        return null;
    }
}//end class