Java Utililty Methods Byte Array to Hex String

StringBuffer hexString = new StringBuffer();
for (int i = 0; i < bytes.length; i++) {
    int hex = (0xff & bytes[i]);
    String tmp = Integer.toHexString(hex);
    tmp = (tmp.length() < 2) ? "0" + tmp : tmp; 
    hexString.append(tmp);
return hexString.toString().toUpperCase();
...

final StringBuilder builder = new StringBuilder(bytes.length * 2);
for (byte b : bytes) {
    builder.append(table[b >> 4 & 0x0f]).append(table[b & 0x0f]);
return builder.toString();

StringBuilder sb = new StringBuilder();
for (int i = 0; i < bytes.length; i++) {
    byte b = bytes[i];
    String hex = Integer.toHexString(b);
    if (hex.length() == 1) {
        hex = "0" + hex;
    if (hex.length() > 2) {
...

if (bytes == null || bytes.length == 0) {
    return EMPTY_STRING;
final StringBuilder builder = new StringBuilder((end - start) << 1);
for (int index = start; index < end; index++) {
    builder.append(String.format("%02x", bytes[index]));
return builder.toString();
...

final char[] chars = new char[2 * data.length];
for (int i = 0; i < data.length; i++) {
    final byte b = data[i];
    chars[2 * i] = toHexDigit((b >> 4) & 0xF);
    chars[2 * i + 1] = toHexDigit(b & 0xF);
return new String(chars);

if (bs == null || bs.length == 0) {
    return "";
StringBuffer str = new StringBuffer(bs.length * 4);
for (int i = 0; i < bs.length; i++) {
    str.append(hex[(bs[i] >> 4) & 0x0f]);
    str.append(hex[bs[i] & 0x0f]);
    if (i > 0 && i % lineLength == lineLength - 1) {
...

char[] hexChars = new char[2 + ((bytes.length - 1) * 3)];
for (int j = 0; j < bytes.length; j++) {
    int v = bytes[j] & 0xFF;
    hexChars[j * 3] = hexArray[v >>> 4];
    hexChars[j * 3 + 1] = hexArray[v & 0x0F];
    if (hexChars.length < (j * 3 + 2)) {
        hexChars[j * 3 + 2] = ' ';
return new String(hexChars);