Java Utililty Methods Hash Code Calculate

List of utility methods to do Hash Code Calculate

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Hash Code Calculate

Description

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

Method

int combinedHashCode(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;

int combineHashCodes(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);

int combineHashCodes(int hashCode1, int hashCode2)
Combines two hash codes to make a new one.

return hashCode1 * 17 + hashCode2;

int combineHashCodes(int hashCode1, int hashCode2)
Combines two hash codes to make a new one.

return hashCode1 * 31 + hashCode2;

int combineHashCodes(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;

int combineHashCodesHelper(int hashCode1, int hashCode2)
combine Hash Codes Helper

int out = 1500450271;
out = ~~(~~(hashCode1 * out) + ~~(hashCode2 & out));
out = ~~(hashCode1 ^ out - hashCode2);
return ~~(hashCode2 ^ out - hashCode1);

int combineHashes(int hash1, int hash2)
combine Hashes

hash1 += (hash2 & 0xffff);
hash1 = (hash1 << 16) ^ ((hash2 >>> 5) ^ hash1);
hash1 += hash1 >>> 11;
return hash1;

int combineHashesBad(int hash1, int hash2)
combine Hashes Bad

return hash1 ^ hash2;

int combineHashesMurmur(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;

int combineHashesOld(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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