Using Recursion to reverse an integer without the use of strings

Question

I have been trying this for some time now but could not get it to work. I am trying to have a method to reverse an integer without the use of strings or arrays. For example,

Answer 1

import java.io.*;

public class ReversalOfNumber {
    public static int sum =0;
    public static void main(String args []) throws IOException
    {
        System.out.println("Enter a number to get Reverse & Press Enter Button");
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String input = reader.readLine();
        int number = Integer.parseInt(input);
        int revNumber = reverse(number);
        System.out.println("Reverse of "+number+" is: "+revNumber);
    }
    public static int reverse(int n)
    {       
        int unit;
        if (n>0)
        {
            unit = n % 10;
            sum= (sum*10)+unit;
            n=n/10;
            reverse(n);
        }
        return sum;
    }
}