Java Utililty Methods Hash Code Calculate

List of utility methods to do Hash Code Calculate

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Description

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

Method

intcombinedHashCode(Object... objects)
Combines hash codes from multiple objects to make a new one. 
final int prime = 31;
int result = 1;
for (Object obj : objects) {
    result = prime * result + getHashCode(obj);
return result;
intcombineHashCodes(final int pHashCode_1, final int pHashCode_2)
Combine two hash codes to obtain a third one representing both. 
return intHashCode(intHashCode(pHashCode_1) - pHashCode_2);
intcombineHashCodes(int hashCode1, int hashCode2)
Combines two hash codes to make a new one. 
return hashCode1 * 17 + hashCode2;
intcombineHashCodes(int hashCode1, int hashCode2)
Combines two hash codes to make a new one. 
return hashCode1 * 31 + hashCode2;
intcombineHashCodes(int numA, int numB, int numC)
Combines 3 hash codes to make a new one. 
final int prime = 31;
int result = 1;
result = prime * result + numA;
result = prime * result + numB;
result = prime * result + numC;
return result;
intcombineHashCodesHelper(int hashCode1, int hashCode2)
combine Hash Codes Helper 
int out = 1500450271;
out = ~~(~~(hashCode1 * out) + ~~(hashCode2 & out));
out = ~~(hashCode1 ^ out - hashCode2);
return ~~(hashCode2 ^ out - hashCode1);
intcombineHashes(int hash1, int hash2)
combine Hashes 
hash1 += (hash2 & 0xffff);
hash1 = (hash1 << 16) ^ ((hash2 >>> 5) ^ hash1);
hash1 += hash1 >>> 11;
return hash1;
intcombineHashesBad(int hash1, int hash2)
combine Hashes Bad 
return hash1 ^ hash2;
intcombineHashesMurmur(int hash2, int hash1)
combine Hashes Murmur 
hash1 *= 0xcc9e2d51;
hash1 = Integer.rotateLeft(hash1, 15);
hash1 *= 0x1b873593;
hash2 ^= hash1;
hash2 = Integer.rotateLeft(hash2, 13);
hash2 = hash2 * 5 + 0xe6546b64;
return hash2;
intcombineHashesOld(int hash1, int hash2)
combine Hashes Old 
hash1 ^= (hash2 & 0xff);
hash1 *= FNV_PRIME;
hash1 ^= (hash2 >>> 8) & 0xff;
hash1 *= FNV_PRIME;
hash1 ^= (hash2 >>> 16) & 0xff;
hash1 *= FNV_PRIME;
hash1 ^= (hash2 >>> 24) & 0xff;
hash1 *= FNV_PRIME;
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