Java Utililty Methods Hash Calculate

List of utility methods to do Hash Calculate

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Description

The list of methods to do Hash Calculate are organized into topic(s).

Method

inthashpair(Object o1, Object o2)
hashpair 
return combine(combine(0, o1), o2);
byte[]hashPoint(int hashlength, double fraction)
returns fraction*FFFF...FF (hashlenth bytes), represented in hex 0th byte is most significant 
int ones = 0xff;
byte[] rslt = new byte[hashlength];
double remainder = 0;
for (int i = 0; i < rslt.length; i++) {
    double product = (fraction * ones) + (remainder * 256);
    int intpart = (int) product;
    remainder = (product - intpart);
    rslt[i] = (byte) intpart;
...
inthashSetSize(final int nrOfElements)
Return a good value for creation of a hash set (to not resize) given a number of elements you wish to insert. 
assert nrOfElements >= 0;
return (int) Math.ceil(((double) nrOfElements) / LOAD_FACTOR);
inthashThem(Object one, Object two)

Return a composite hash code of two objects.

return hashIt(one) | hashIt(two);
floathashToFloat(int x, int y, long seed)
Hashes a 2D location and seed to return a normalized float. 
final long hash = x * 73428767 ^ y * 9122569 ^ seed * 457;
return (hash * (hash + 456149) & 0x00ffffff) / (float) 0x01000000;
longhashToLong(final byte[] hash)
hash To Long 
long ret = 0;
for (int i = 5; i >= 0; i--)
    ret += (hash[i] & 0xFF) * Math.pow(256, 5 - i);
return ret;
StringhashToName(long l)
Converts a long hash to a string. 
int i = 0;
char ac[] = new char[12];
while (l != 0L) {
    long l1 = l;
    l /= 37L;
    ac[11 - i++] = VALID_CHARS[(int) (l1 - l * 37L)];
return new String(ac, 12 - i, i);
...
inthashV(Object... a)
Computes a hash code over var args. 
int h = 19690721;
for (Object o : a) {
    h = hash(h, o);
return h;
inthashValueFor(final boolean b)
hash Value For 
return b ? 1 : 0;
StringtoHash(Long number)
Returns a String representation of the number provided as an unsigned integer in base 16. 
return (number == null) ? null : Long.toHexString(number);