CSC 0220-08 Stack

Modify the add method that adds two numbers using stack like the following:

package StackQ;
import java.util.*;
public class Addition {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Input two numbers");

Addition a = new Addition();
String s1= input.next();
String s2 = input.next();

Stack op1 = new Stack();
Stack op2 = new Stack();

for(int i = 0 ; i < s1.length() ; i++) op1.push(Character.getNumericValue(s1.charAt(i)));
for(int i = 0 ; i < s2.length() ; i++) op2.push(Character.getNumericValue(s2.charAt(i)));
System.out.println(a.add(op1, op2));
}

public String add(Stack op1, Stack op2) {
Stack< Integer> result = new Stack();
String returnVal="";
return returnVal;
}
}