Put byte arrays to hex string decoder.

Decoder.java

public static String bytesToHex(byte[] bytes) {
    char[] hexChars = new char[bytes.length * 2];
    for ( int j = 0; j < bytes.length; j++ ) {
        int v = bytes[j] & 0xFF;
        hexChars[j * 2] = hexArray[v >>> 4];
        hexChars[j * 2 + 1] = hexArray[v & 0x0F];
    }
    return new String(hexChars);
}

//examples:
// (byte)-112, (byte)0, (byte)1 -> 0x90, 0x00, 0x01
System.out.println(bytesToHex(new byte[]{-112,0,1}));