Write java code to reverse a given number

import java.io.*;

class ReverseNum
{
public static void main(String args[]) throws IOException
{
int num,rem,revnum=0,originalnum;
System.out.println("Enter a number");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
num=Integer.parseInt(br.readLine());
originalnum=num;
while(num>0)
{
rem=num%10;
num=(num-rem)/10;
revnum=revnum*10+rem;
}
System.out.println("Reverse of "+originalnum+" is "+revnum);
}
}