Reverse Integer

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321

public class Solution {
    public int reverse(int x) {
        int sign = 1;
        if(x<0)
            sign=-1;
        int res = 0;
        x= Math.abs(x);
        while(x>0){
            res = 10*res+x%10;
            x /=10;
        }
        if(res<0) return -1;
        return res*sign;
    }
}