Review

Method concatenates strings using + in a loop

• missing/call
• superfluous/call

sos/util/Hex.java

bytesToASCIIString(byte[])

class Hex {
   public static String bytesToASCIIString(byte[] data) {
      String result = "";
      for (int i = 0; i < data.length; i++) {
         char c = (char)data[i];
         result += Character.toString(PRINTABLE.indexOf(c) >= 0 ? c : '.');
      }
      return result;
   }

}