import java.text.DecimalFormat;
import java.text.NumberFormat;

public class ChessTutorFL {

public static void main(String[] args) {
   char option = ' ';
   char input;
   /**
      * Create ONE multi-line string to serve as the menu
      */
   String menu
            = "-----------------------------\n"
            + "Chess Tutoring Income Options\n"
            + "-----------------------------\n"
            + "Daily earning on Day N       [D]\n"
            + "Total earning up to Day N    [T]\n"
            + "History of earning up to Day N [H]\n"
            + "Quit                         [Q]\n"
            + "Enter option: ";

   while (option != 'Q') {

         // Make sure caseinsensitive handling is working.
         /**
         * Handling of invalid options, case insensitivity (in switch)
         */
         input = UtilsFL.readChar(menu, false);
         option = Character.toUpperCase(input);

         // switch cases are standalone method calls ONLY, no other code
         switch (option) {
            case 'D':
               showDailyEarnings();
               break;
            case 'T':
               showTotalEarnings();
               break;
            case 'H':
               showHistoryEarnings();
               break;
            case 'Q':
               break;
            default:
               System.out.printf(
                        "Unrecognized option %c, please try again\n",
                        input);
         }
         /**
         * Titled menu displayed EACH iteration, whitespace between
         * iterations, termination message, general readability
         */
         System.out.println("");
   }
}

The class should have a double field named availableBalance that ho...