Java Utililty Methods Hash Code Calculate

if (obj instanceof String) {
    char[] array = ((String) obj).toCharArray();
    int[] intArray = new int[(int) Math.ceil((double) (array.length) / 2)];
    for (int i = 0, j = 0; i < intArray.length; i++) {
        char[] toInt = new char[2];
        if (j < array.length) {
            toInt[0] = array[j++];
        if (j < array.length) {
            toInt[1] = array[j++];
        intArray[i] = charToInt(toInt);
    int num = 0x15051505;
    int num2 = num;
    for (int i = array.length, j = 0; i > 0; i -= 4, j += 2) {
        num = (((num << 5) + num) + (num >> 0x1b)) ^ intArray[j];
        if (i <= 2) {
            break;
        num2 = (((num2 << 5) + num2) + (num2 >> 0x1b)) ^ intArray[j + 1];
    return (num + (num2 * 0x5d588b65));
} else
    return obj.hashCode();

if (object == null) {
    return 0;
if (object.getClass().isArray()) {
    if ((object instanceof Object[])) {
        return hashCode((Object[]) object);
    if ((object instanceof boolean[])) {
...

return object != null ? object.hashCode() : 0;

if (object == null) {
    return 0;
return object.hashCode();

return (object != null ? object.hashCode() : 0);

if (objects == null)
    return 0;
int result = 1;
int idx = objects.length;
while (--idx >= 0) {
    Object object = objects[idx];
    result = 17 * result + (object == null ? 0 : object.hashCode());
return result;

return value != null ? value.hashCode() : null;

if (value != null) {
    return value.hashCode();
return 0;

return value != null ? value.hashCode() : 0;

return (value == null) ? 0 : value.hashCode();