Java Program To Reverse a number

public class Reverse{

    

    public static void main(String[] args){

int n=1234, rev=0;

        while(n!=0){

            int rem=n%10;

            rev=rev*10+rem;

            n=n/10;

        }

        System.out.println(rev);

    

    }

} 

Ouput:4321