sum of two integers

public class  {
    public int getSum(int a, int b) {
        if (a == 0)
            return b;
        if (b == 0)
            return 0;
        while(b != 0) {
            int c = a & b;
            a = a ^ b;
            b = c << 1;
        }
        return a;
    }
}