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

inthashFNV32(int val)
32 bit FNV hash. 
int hashVal = FNV_OFFSET_BASIS_32;
for (int i = 0; i < 4; i++) {
    int octet = val & 0x00ff;
    val = val >> 8;
    hashVal = hashVal ^ octet;
    hashVal = hashVal * FNV_PRIME_32;
return Math.abs(hashVal);
...
longhashFNV64(byte[] bytes)
FNV hashes are designed to be fast while maintaining a low collision rate. 
long nHashVal = 0xcbf29ce484222325L;
long nMagicPrime = 0x00000100000001b3L;
for (int i = 0; i < bytes.length; i++) {
    nHashVal ^= bytes[i];
    nHashVal *= nMagicPrime;
return nHashVal;
inthashForEqual(Class clazz)
hash For Equal 
return hashForEqual(clazz.getName());
inthashHC(int i)
hash HC 
return (i * -1640531535) >>> ((MIN_MATCH * 8) - HASH_LOG_HC);
inthashHsieh(int init, Object... vals)
hash Hsieh 
if (vals == null || vals.length == 0) {
    return init;
int hash = init;
for (final Object o : vals) {
    final int thingHash = o.hashCode();
    hash += (thingHash >>> 16);
    final int tmp = ((thingHash & 0xffff) << 11) ^ hash;
...
inthashInt(final int v)
Quickly mixes the bits of an integer. 
final int h = v * INT_PHI;
return h ^ (h >>> 16);
inthashIntArray(int seed, int[] data, int offset, int len)
hash Int Array 
int h1 = seed;
int off = offset;
int end = offset + len;
while (off < end) {
    int k1 = data[off++];
    k1 *= 0xcc9e2d51;
    k1 = Integer.rotateLeft(k1, 15);
    k1 *= 0x1b873593;
...
inthashIt(Object o)

Return an object's hash code or 0 if the object is null.

if (o == null)
    return 0;
else
    return o.hashCode();
inthashJava32(byte[] byteList)
This is a copy of the hash function in JDK 1.6 to ensure it does not change. 
if (byteList == null) {
    return 0;
long hash = 1;
for (int i = 0; i < byteList.length; i++) {
    byte element = byteList[i];
    hash = 31 * hash + element;
return (int) hash & BITMASK_POSITIVE_32;
longhashJava64(byte[] byteList)
hash Java 
if (byteList == null) {
    return 0;
long hash = 1;
for (byte element : byteList) {
    hash = 31 * hash + element;
return hash & BITMASK_POSITIVE_64;
...