将JComboBox选择保存到ArrayList

Question

I cannot retrieve the selection in the JComboBox that was selected by the user. the J ComboBox inclued a list of car registration numbers, which then the user has to select one and it will be added to the booking ArrayList. Unfortunately it is not working properly. and the booking is not being saved because of this. Please Help Me! Maybe I need to change the get Method for the combo box.

ArrayList BookingList = CarRentalSystem.BookingList;
ArrayList CarList = CarRentalSystem.CarList;
UsingFiles BookingFile = CarRentalSystem.BookingFile;
String [] regNums;

public NewBooking() {

        regNums = new String[CarList.size()+1];
        for (int i = 0; i< CarList.size();i++){
            regNums[i] = ""+((Car)CarList.get(i)).getCarNum();
        }
                initComponents();

....
Booking book = new Booking();

String regNum = cmbCar.getActionCommand();
 book.getRegNum();

Answer 1

Not easy to understand what u want can you add more code?

try this to convert your list into a String Array that u pass in as a argument to your combobox.

    public String[] regNums() {

        String tArray[] = null;

        for (int i=0; i<carList.size(); i++){           
            //Convert into a String[] and put the arrayList values in it.
            tArray = carList.toArray(new String[i]);                
        }
    }