Java Utililty Methods Array Hash Code

int arrayHashCode(Object array[])
Calling hashCode on an array does not go into the items in the array, as would be done for a List.

int result = 0;
if (array != null) {
 for (int i = 0; i < array.length; i++) {
 Object obj = array[i];
 result += obj.hashCode();
return result;
...

int arrayHashCode(Object[] arr)
array Hash Code

int hash = 0;
if (arr != null) {
 hash ^= arr.getClass().hashCode();
 for (int i = 0; i < arr.length; ++i) {
 hash ^= arr[i] == null ? 0 : arr[i].hashCode();
return hash;
...

int arrayHashCode(Object[] arr)
Compute hash code of array.

int c = 0;
int len = arr.length;
for (int i = 0; i < len; i++) {
 Object o = arr[i];
 int v = o == null ? 1 : o.hashCode();
 c += (v ^ i);
return c;
...

int arrayHashCode(Object[] objects)
array Hash Code

int hc = 0;
if (objects != null) {
 for (int i = 0; i < objects.length; i++) {
 hc += (objects[i] != null ? (objects[i].hashCode() * 31) : 0);
return hc;

int byteArrayHashCode(final byte[] array)
Obtain the hashcode of a byte array.

return Arrays.hashCode(array);

int calculateHash(byte[] data)
calculate Hash

return Arrays.hashCode(data);

int deepHash(Object[] t)
deep Hash

return Arrays.deepHashCode(t);

int deepHashCode(double[][] matrix)
Computes hashCode of a given matrix

int retVal = 0;
for (int i = 0; i < matrix.length; i++) {
 retVal += Arrays.hashCode(matrix[i]);
return retVal;

int hashCode(byte[] bytes)
This function calculates a hash code for the specified byte array.

int hash = Arrays.hashCode(bytes);
return hash;

int hashCode(byte[] obj)
hash Code

if (obj == null)
 return 0;
return Arrays.hashCode(obj);