Best way to convert a signed integer to an unsigned long?

Question

For certain hash functions in Java it would be nice to see the value as an unsigned integer (e.g. for comparison to other implementations) but Java supports only signed type

Answer 1

other solution.

public static long getUnsignedInt(int x) {
    if(x > 0) return x;
    long res = (long)(Math.pow(2, 32)) + x;
    return res;
}