Sum of digits of a number in Java

import java.io.*;
class Sum1 {
 int total = 0, remainder;
 public void add(int num) {
  while (num > 0) {
   remainder = num % 10;
   total = total + remainder;
   num = num / 10;
  }
  System.out.println("Sum of the digits in the given number is:" + total);
 }
}
class Summain {
 public static void main(String args[]) throws IOException {
  int num;
  Sum1 s1 = new Sum1();

  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  System.out.println("\nEnter the number:");
  num = Integer.parseInt(br.readLine());
  s1.add(num);
 }
}