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private void displayAppointmentList() throws FileNotFoundException, IOException {
        // return list of appointment with cust details 
        BufferedReader brApp = new BufferedReader(new FileReader(appointmentTxtFile));
        List<Appointment> appointmentList = new ArrayList<Appointment>();
        BufferedReader brCust = new BufferedReader(new FileReader(custTxtFile));
        List<Customer> custList = new ArrayList<Customer>();
        //skip the first line 
        String firstLine = brApp.readLine();
        String firstLineCust = brCust.readLine();
        //System.out.println(firstLine);
        Scanner sc = new Scanner(brApp);
        Scanner scCust = new Scanner(brCust);
        while (sc.hasNextLine() && scCust.hasNextLine()) {
            String dataLine = sc.nextLine();
            String custDataLine = scCust.nextLine();
            //System.out.println(dataLine);
            String data[] = dataLine.split(",");
            String custData[] = custDataLine.split(",");

            Appointment appointment = new Appointment();
            appointment.setAppointmentID(Integer.valueOf(data[0]));
            appointment.setAppointmentFees(Integer.valueOf(data[1]));
            appointment.setAppointmentDate(data[2]);
            appointment.setAppointmentTime(data[3]);
            appointment.setAppointmentFeedback(data[4]);
            appointment.setAppointmentStatus(data[5]);
            Customer cust = new Customer(Integer.valueOf(custData[0]), custData[1], custData[2], custData[3]);
            custList.add(cust);
            appointmentList.add(appointment);
        }
        sc.close();
        brApp.close();
        AppointmentTableModel apptablemodel = new AppointmentTableModel();
        //warning: the row number of appList must == row number of custList for the rowcount to display properly
        apptablemodel.setList(appointmentList, custList);
        AppointmentTable.setModel(apptablemodel);
    }