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

inthashJenkins(int init, Object... vals)
hash Jenkins 
if (vals == null || vals.length == 0) {
    return init;
int a, b, c;
a = b = c = BASE + (vals.length << 2) + init;
int pos = 0;
while (vals.length - pos > 3) {
    a += vals[pos].hashCode();
...
inthashLong(long id)
hash Long 
return (int) (id ^ id >>> 32);
inthashLong(long l)
Returns a hash code for a long. 
return (int) (l ^ (l >>> 32));
inthashMapCapacity(final int nElements)
return a good initialCapacity for a HashMap that will hold a given number of elements 
return (int) ((nElements * 4L) / 3) + 1;
inthashMore(final int hash, final int more)
hash More 
int result = hash << 1;
if (result < 0)
    result |= 1;
return result ^ more;
longhashName(CharSequence name)
hash Name 
long hash = 0L;
int size = name.length();
for (int index = 0; index < size; index++) {
    hash *= 37L;
    char c = name.charAt(index);
    if (c >= 'A' && c <= 'Z') {
        hash += (long) ('\001' + c - 'A');
    } else if (c >= 'a' && c <= 'z') {
...
inthashObject(Object obj)
A convenience function for hashing an object without getting NullPointerException s 
return obj == null ? 0 : obj.hashCode();
inthashOrNull(Object value)
hash Or Null 
return value == null ? 1 : value.hashCode();
inthashOrZero(Object o)
Note -- if you are using Arrays.equals( ... 
return (o == null ? 0 : o.hashCode());
longhashPair(int a, int b)
Generates a unique number based from two arguments. 
if (a >= 0 || b >= 0) {
    return a >= b ? a * a + a + b : a + b * b;
} else {
    throw new IllegalArgumentException("a and b must be positive.");