Reverse Integer

public class Solution {
    public int reverse(int x) {
        int res = 0;
        int num = Math.abs(x);
        while (num != 0) {

            if (res > (Integer.MAX_VALUE - num%10 )/10) {
                return 0;
            }
            res = res*10 + num % 10;
            num = num/10;
        }
        if (x < 0) {
            return -res;
        } else {
            return res;
        }
    }
}