[Java] UnicodeFormatter

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import java.io.*;
import java.nio.charset.Charset;
import java.util.ArrayList;

public class UnicodeFormatter  {

   static public String byteToHex(byte b) {
      // Returns hex String representation of byte b
      char hexDigit[] = {
         '0', '1', '2', '3', '4', '5', '6', '7',
         '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
      };
      char[] array = { hexDigit[(b >> 4) & 0x0f], hexDigit[b & 0x0f] };
      return new String(array);
   }

   static public String charToHex(char c) {
      // Returns hex String representation of char c
      byte hi = (byte) (c >>> 8);
      byte lo = (byte) (c & 0xff);
      return byteToHex(hi) + byteToHex(lo);
   }
}