Reverse a number in Java

Question:

How to reverse a number in Java?

Code:

class ReverseNumber {
 
  public static void main(String args[]) {
 
    int num=123456789;
    int r=0;
    int s=0;
    System.out.println("Number: " + num);
 
    while(num>0) {
      r=num%10;
      s=(s*10)+r;
      num=num/10;
    }
    System.out.println("Reverse: " + s);
  }
}

Output:

$ java ReverseNumber
Number: 123456789
Reverse: 987654321