How to reverse a number in java

Java code to reverse a given number


import java.io.*;



class Test {

          public static void main(String[] args) throws IOException {



              int num,sum=0,r;

              System.out.println("Enter a number");

              BufferedReader br=new BufferedReader(new InputStreamReader (System.in));

              num=Integer.parseInt(br.readLine());



              while(num!=