convert To Hex String

encode_decode.java

 public static String convertToHexString(byte[] data) {
        StringBuilder buf = new StringBuilder();
        for (byte b : data) {
            int halfbyte = (b >>> 4) & 15;
            int two_halfs = 0;
            while (true) {
                char c = (halfbyte < 0 || halfbyte > 9) ? (char) ((halfbyte - 10) + 97) : (char) (halfbyte + 48);
                buf.append(c);
                halfbyte = b & 15;
                int two_halfs2 = two_halfs + 1;
                if (two_halfs >= 1) {
                    break;
                }
                two_halfs = two_halfs2;
            }
        }
        return buf.toString();
    }