java check whether integer is palindrome

/**
 * @author lautturi.com
 * Java example:determine whether an integer is a palindrome in java 
 */

import java.util.*;

public class Lautturi {

	public static boolean checkPalindrome(Integer num)
	{     
	 
		String str = String.valueOf(num);
	    int len = str.length();

	    for(int i = 0; i < len / 2; i++)  {
	        if (str.charAt(i) != str.charAt(len - i - 1))
	            return false;
	    }
	    return true;
	}

	public static void main(String[] args) {

		System.out.println(checkPalindrome(1234));
		System.out.println(checkPalindrome(12321));

	}
}

output:

false
true