To check divisibility of any large number by 9 in java

If the sum of the digits of a number is divisible by 9, then the number is divisible by 9.

Some examples of numbers divisible by 9 are as follows.

•  The number 51984 is divisible by 9 because the sum of its digits (5+ 1 + 9 + 8 + 4 = 27) is divisible by 9.
• The number 91403 is not divisible by 9 because the sum of its digits (9 + 1 + 4 + 0 + 3 = 17) is not divisible by 9.

Program

import java.util.Scanner;

public class DivisibleBy9 {
   public static void main(String args[]) {
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter a number :");
      String num = sc.nextLine();
      int digitSum = 0;
      for(int i = 0; i<num.length(); i++){
         digitSum = digitSum + num.charAt(i)-'0';
      }
      if(digitSum % 9 == 0){
         System.out.println("Given number is divisible by 9");
      } else {
         System.out.println("Given number is not divisible by 9");
      }
   }
}

Output

Enter a number :
51984
Given number is divisible by 9