Java Program to accept any number and print it in reverse order

The following code is to reverse the number entered by the user.
Code:-

import java.util.*;
public class Reverse{
    Scanner scan=new Scanner(System.in);
    int num, n, s=0, d;
    public void input()throws IOException{
        System.out.println("Enter any number: ");
        num=scan.nextInt();
    }

    public void compute(){
        n=num;
        while(num>0){
            d=num%10;
            s=s*10+d;
            num/=10;
        }
        System.out.println("Number before: "+n);
        System.out.println("Number after: "+s);
    }

    public static void main(String[] args)throws IOException{
        Reverse obj=new Reverse();
        obj.input();
        obj.compute();
    }
}

Output:-
Enter any number:
123
Number before: 123
Number after: 321