Java Utililty Methods Byte Array Create

hex = hex.toLowerCase();
byte[] buf = new byte[hex.length() / 2];
int j = 0;
for (int i = 0; i < buf.length; i++) {
    buf[i] = (byte) ((Character.digit(hex.charAt(j++), 16) << 4) | Character.digit(hex.charAt(j++), 16));
return buf;

byte[] byteArray = new byte[hex.length() / 2];
for (int i = 0; i < byteArray.length; i++) {
    byteArray[i] = (byte) Integer.parseInt(hex.substring((i * 2), ((i * 2) + 2)), 16);
return byteArray;

if (hexStr.length() < 1)
    return null;
byte[] result = new byte[hexStr.length() / 2];
for (int i = 0; i < hexStr.length() / 2; i++) {
    int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
    int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
    result[i] = (byte) (high * 16 + low);
return result;

byte[] buffer = new byte[hexString.length() / 2];
for (int i = 0; i < buffer.length; i++)
    buffer[i] = toByte(hexString.substring(2 * i, 2 * i + 2));
return buffer;

int arrLength = hexString.length() >> 1;
byte buff[] = new byte[arrLength];
for (int i = 0; i < arrLength; i++) {
    int index = i << 1;
    String digit = hexString.substring(index, index + 2);
    buff[i] = (byte) Integer.parseInt(digit, 16);
return buff;
...

if ((hexString.length() % 2) == 1) {
    return null;
try {
    int idx = 0;
    byte result[] = new byte[hexString.length() / 2];
    for (int i = 0; i < hexString.length(); i += 2) {
        String val = hexString.substring(i, i + 2);
...

int[] values = toIntArray(map);
if (values == null) {
    return null;
byte[] bytes = new byte[values.length];
for (int i = 0; i < values.length; i++) {
    bytes[i] = (byte) values[i];
return bytes;

byte[] ba = new byte[s.length() / 2];
for (int i = 0; i < ba.length; i++) {
    ba[i] = toByte(s.substring(2 * i, 2 * i + 2));
return ba;

String s = source.replaceAll(" |\n", "");
byte[] b = new byte[s.length() / 2];
if ((s.length() % 2) != 0) {
    throw new IllegalArgumentException("need even number of hex double digits [" + s.length() + "]");
for (int i = 0; i < s.length(); i += 2) {
    String q = s.substring(i, i + 2);
    b[i / 2] = (byte) Integer.parseInt(q, 16);
...

byte[] result = new byte[str.length() + 1];
for (int i = 0; i < str.length(); i++) {
    result[i] = (byte) str.charAt(i);
result[str.length()] = 0;
return result;