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

inthash(Object obj)
Same hash function as HashMap#newHash method. 
int h = obj.hashCode();
h ^= (h >>> 20) ^ (h >>> 12);
return h ^ (h >>> 7) ^ (h >>> 4);
Integerhash(Object obj)
hash 
Integer rtn = null;
if (obj != null) {
    rtn = obj.hashCode();
return rtn;
inthash(Object object)
Returns a hash code for non-null Object x. 
int h = object.hashCode();
h ^= (h >>> DOUG_LEA_BLACK_MAGIC_OPERAND_1) ^ (h >>> DOUG_LEA_BLACK_MAGIC_OPERAND_2);
return h ^ (h >>> DOUG_LEA_BLACK_MAGIC_OPERAND_3) ^ (h >>> DOUG_LEA_BLACK_MAGIC_OPERAND_4);
inthash(Object v)
hash 
return v == null ? 0 : v.hashCode();
Stringhash(Object value)
hash 
if (value == null) {
    return "null";
int hashcode = value.hashCode();
char[] hexChars = new char[8];
hexChars[0] = HEX_CHARS[(hashcode >> 28) & 0xF];
hexChars[1] = HEX_CHARS[(hashcode >> 24) & 0xF];
hexChars[2] = HEX_CHARS[(hashcode >> 20) & 0xF];
...
inthash(Object value, int seed)
Alters the given seed with the hash code value computed from the given value. 
seed *= PRIME_NUMBER;
if (value != null) {
    assert !value.getClass().isArray() : value;
    seed += value.hashCode();
return seed;
inthash(Object... as)
Create a hash code for a list of objects. 
if (as == null)
    return 0;
int hash = 0;
for (Object a : as) {
    if (hash != 0)
        hash = 41 * hash + hash1(a);
    else
        hash = 41 + hash1(a);
...
longhash(Object... value)
hash 
String key = toString(value);
long hash;
int i;
for (hash = key.length(), i = 0; i < key.length(); ++i)
    hash = (hash << 4) ^ (hash >> 28) ^ key.charAt(i);
return hash;
inthash(Object... values)
hash 
int code = 17;
for (Object value : values) {
    code += hashOrNull(value);
    code *= 37;
return code;
inthash(Object[] array)
calculate the array hash (only the first level) 
int length = array.length;
int seed = SEED;
for (Object anArray : array) {
    seed = hash(seed, anArray == null ? 0 : anArray.hashCode());
return seed;