stack

import java.util.*;
public class Stack<E extends Number>
{
	private ArrayList<E> list;
	public Stack(ArrayList<E> list)
	{
		this.list=list;
	}
	public void push(E element)
	{
		list.add(element);
	}
	public E pop()
	{
		E v=list.get(list.size()-1);
		list.remove(v);
		return  v;
	}
	public int size ()
	{
		return list.size();
	}
	public double average()
	{
		int length=this.size();
		double sum=0.0;
		while(!list.isEmpty())
			sum+=this.pop().doubleValue();
		return sum/length;
	}
	public boolean CompareAverage(Stack<?> s)
	{
		if(this.average()==s.average())
			return true;
		
		return false;
	}
	
		
		
		
		
		
	public static void main(String[] args)
	{
		Stack<Integer> s1=new Stack(new ArrayList<Integer>());
		s1.push(1);
		s1.push(2);
		s1.push(3);
		s1.push(4);
	//	s1.push(5);
		System.out.println("Integers Average of  s1 is "+s1.average());
		
		Stack<Double> s2=new Stack(new ArrayList<Double>());
		s2.push(1.1);
		s2.push(2.2);
		s2.push(3.3);
		s2.push(4.4);
	//	s2.push(5.5);
		System.out.println("Doubles Average of  s2 is "+s2.average());
		System.out.println("same avg?"+s1.CompareAverage(s2));
		
	}
}