Java byte array to hexdump. Format similar to default of hexdump(1).

hexdump.java

    static String hexDump(byte[] bytes) {
        Formatter format = new Formatter(new StringBuilder());
        for (int j = 0; j < bytes.length; j++) {
            if (j % 16 == 0) {
                format.format((j > 0 ? "\n" : "") + "%08X  ", j);
            }
            format.format("%02X ", bytes[j]);
        }
        return format.toString();
    }