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  private void displayAppointmentList(int appID) throws FileNotFoundException, IOException {
 
        List<Appointment> appointmentList;
        List<Customer> custList;
        try ( // return list of appointment with cust details
                BufferedReader brApp = new BufferedReader(new FileReader(appointmentTxtFile))) {
            appointmentList = new ArrayList<Appointment>();
            BufferedReader brCust = new BufferedReader(new FileReader(custTxtFile));
            custList = new ArrayList<Customer>();
            Scanner sc = new Scanner(brApp);
            Scanner scCust = new Scanner(brCust);
            //skip the previous line
            for (int i = 0; i < appID; i++) {
                sc.nextLine();
                
            }  
            String lineIwant = sc.nextLine();
            System.out.println(lineIwant);
            String data[] = lineIwant.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]);
            appointmentList.add(appointment);
            //get custID
            currentCustID = Integer.valueOf(data[6]);
            for (int i = 0; i < currentCustID; i++) {
                scCust.nextLine();
                
            }   String custDataLine = scCust.nextLine();
            String custData[] = custDataLine.split(",");
            Customer cust = new Customer(Integer.valueOf(custData[0]), custData[1], custData[2], custData[3]);
            custList.add(cust);
            lblCustName2.setText(cust.getCustName());
            lblDate2.setText(appointment.getAppointmentDate());
            lblTime2.setText(appointment.getAppointmentTime());
            BufferedReader brTech = new BufferedReader(new FileReader(userTxtFile));
            currentTechID= Integer.valueOf(data[7]);
            Scanner scTech = new Scanner(brTech);
            for (int i = 0; i <currentTechID;i++){
                scTech.nextLine(); //skip the previous line
            }       String techDataLine = scTech.nextLine();
            String techData[]= techDataLine.split(",");
            lblTechnicianName.setText(techData[4]);
            //store current selected details
            currentDate = appointment.getAppointmentDate();
            currentCustName = cust.getCustName();
            currentTechName = techData[4];
            currentPhoneNo = cust.getCustPhoneNo();
            currentAddress = cust.getCustAddress();
            sc.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);
        AppointmentTable2.setModel(apptablemodel);
    }