byte(10進数)をグラフィック(大文字と小文字、記号)に変換

/**
 *  byte( ) 
 */

public static String ByteToLetter (byte[] chars) {
   String Letter = "";
   for (int i = 0; i < chars.length; i++) {
      switch (chars[i]) {
         case 45:
            Letter += "-";
            break;
         case 46:
            Letter += ".";
            break;
         case 47:
            Letter += "/";
            break;
         case 48:
            Letter += "0";
            break;
         case 49:
            Letter += "1";
            break;
         case 50:
            Letter += "2";
            break;
         case 51:
            Letter += "3";
            break;
         case 52:
            Letter += "4";
            break;
         case 53:
            Letter += "5";
            break;
         case 54:
            Letter += "6";
            break;
         case 55:
            Letter += "7";
            break;
         case 56:
            Letter += "8";
            break;
         case 57:
            Letter += "9";
            break;
         case 65:
            Letter += "A";
            break;
         case 66:
            Letter += "B";
            break;
         case 67:
            Letter += "C";
            break;
         case 68:
            Letter += "D";
            break;
         case 69:
            Letter += "E";
            break;
         case 70:
            Letter += "F";
            break;
         case 71:
            Letter += "G";
            break;
         case 72:
            Letter += "H";
            break;
         case 73:
            Letter += "I";
            break;
         case 74:
            Letter += "J";
            break;
         case 75:
            Letter += "K";
            break;
         case 76:
            Letter += "L";
            break;
         case 77:
            Letter += "M";
            break;
         case 78:
            Letter += "N";
            break;
         case 79:
            Letter += "O";
            break;
         case 80:
            Letter += "P";
            break;
         case 81:
            Letter += "Q";
            break;
         case 82:
            Letter += "R";
            break;
         case 83:
            Letter += "S";
            break;
         case 84:
            Letter += "T";
            break;
         case 85:
            Letter += "U";
            break;
         case 86:
            Letter += "V";
            break;
         case 87:
            Letter += "W";
            break;
         case 88:
            Letter += "X";
            break;
         case 89:
            Letter += "Y";
            break;
         case 90:
            Letter += "Z";
            break;
         case 95:
            Letter += "a";
            break;
         case 98:
            Letter += "b";
            break;
         case 99:
            Letter += "c";
            break;
         case 100:
            Letter += "d";
            break;
         case 101:
            Letter += "e";
            break;
         case 102:
            Letter += "f";
            break;
         case 103:
            Letter += "g";
            break;
         case 104:
            Letter += "h";
            break;
         case 105:
            Letter += "i";
            break;
         case 106:
            Letter += "j";
            break;
         case 107:
            Letter += "k";
            break;
         case 108:
            Letter += "l";
            break;
         case 109:
            Letter += "m";
            break;
         case 110:
            Letter += "n";
            break;
         case 111:
            Letter += "o";
            break;
         case 112:
            Letter += "p";
            break;
         case 113:
            Letter += "q";
            break;
         case 114:
            Letter += "r";
            break;
         case 115:
            Letter += "s";
            break;
         case 116:
            Letter += "t";
            break;
         case 117:
            Letter += "u";
            break;
         case 118:
            Letter += "v";
            break;
         case 119:
            Letter += "w";
            break;
         case 120:
            Letter += "x";
            break;
         case 121:
            Letter += "y";
            break;
         case 122:
            Letter += "z";
            break;
         default:
            Letter += "";
      }
   }
   return Letter;
}