how to reverse a number in java

/**
 * @author lautturi.com
 * Java example: reverse an integer in java
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {

		int num = 1234;
		int reversed=0;
		while(num != 0) 
		{
		   int digit = num % 10;
		   reversed = reversed * 10 + digit;
		   num /= 10;
		}

		System.out.println(reversed);

	}
}

output:

4321