public void setMessage (String message){
        // generate key from 1-50
          key = (int)( Math.random() * 50) + 1 ;

         decryptString = message ;

         Encode();
   }

   public void setMessage(String message, int number){

        decryptString = message ;

        key = number;

        if (key >= 51 || key <= 0){

        key = 1;

        } else{

            Encode();

        }
   }