Write a program to compute sum of digits of a given number

import java.io.*;
public class Adddigit {
    public static void main(String [] args)throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));                                  System.out.println("Enter a number to find the sum of digits of a number"); 
        String num = br.readLine();
        int a = Integer.parseInt(num);
        int sum=0;
        while(a!=0) 
        {             
           int i=a%10;
           sum=sum+i;
           a=a/10;
        }
        System.out.println("the sum of the digits entered = "+sum);
    }
}