readCarFile

 private void readCarFile(Stage primaryStage) {
        // Open a file dialog to let user choose a file.
        FileChooser fileChooser = new FileChooser();
        fileChooser.setTitle("Open file.");
        File f = fileChooser.showOpenDialog(primaryStage);
        // Will catch any errors if they occur.
        try {
            // Need both of these to properly read the file.
            FileReader fileReader = new FileReader(f);
            BufferedReader bufferedReader = new BufferedReader(fileReader);

            String currentLine;
            // Looping through each line of the file and splitting it into an array based on commas.
            while ((currentLine = bufferedReader.readLine()) != null) {
                String s = currentLine.replaceAll("\\s+", "");
                String[] splitLine = s.split(", ");
                // Extract information from each line.
                String numbPlate = splitLine[0];
                String model = splitLine[1];
                String vehicleS = splitLine[2];

                TypeOfVehicle typeOfVehicle = null;

                // Convert string of vehicles number plates to actual types of vehicle object.
                for (TypeOfVehicle veh : TypeOfVehicle.getVehicle()) {
                    if (veh.getBodyType().equals(vehicleS)) {
                        typeOfVehicle = veh;
                        break;
                    }
                }
                String colour = splitLine[3];
                String mileage = splitLine[4];
                String accHistory = splitLine[5];
                String tType = splitLine[6];
                Double price = null;
                Date arrivalDate = null;
                Date sellDate = null;
                // If an arrival date is set.
                if (splitLine[2].equals("small") || splitLine[2].equals("large") ) {
                    price = Double.parseDouble(splitLine[8]);
                    if (splitLine.length >= 10) {
                        // Convert string to Date based on conditions.
                        String arriveDateStr = splitLine[9];
                        String[] arriveDateStrA = arriveDateStr.split("-");
                        arrivalDate = new GregorianCalendar(Integer.parseInt(arriveDateStrA[0]), Integer.parseInt(arriveDateStrA[1]) - 1,
                                Integer.parseInt(arriveDateStrA[2])).getTime();
                        if (splitLine.length == 11) {
                            String sellDateStr = splitLine[10];
                            String[] sellDateStrs = sellDateStr.split("-");
                            sellDate = new GregorianCalendar(Integer.parseInt(sellDateStrs[0]), Integer.parseInt(sellDateStrs[1]) - 1,
                                    Integer.parseInt(sellDateStrs[2])).getTime();
                        }
                    }
                }
                        if (splitLine[2] == "") {
                            price = Double.parseDouble(splitLine[7]);
                            if (splitLine.length >= 9) {
                                // Convert string to Date based on conditions.
                                String arriveDateStr = splitLine[8];
                                String [] arriveDateStrA = arriveDateStr.split("-");
                                arrivalDate = new GregorianCalendar(Integer.parseInt(arriveDateStrA[0]), Integer.parseInt(arriveDateStrA[1]) - 1,
                                        Integer.parseInt(arriveDateStrA[2])).getTime();
                                // If an sell date is set.
                                if (splitLine.length == 10) {
                                    // Convert string to Date based on guidelines.
                                    String sellDateStr = splitLine[9];
                                    String[] sellDateStrs = sellDateStr.split("-");
                                    sellDate = new GregorianCalendar(Integer.parseInt(sellDateStrs[0]), Integer.parseInt(sellDateStrs[1]) - 1,
                                            Integer.parseInt(sellDateStrs[2])).getTime();
                                }
                            }

                        } else {
                            arrivalDate = new Date();
                        }


                        // If the typeOfVehicle supplied is in our defined list.
                        if (typeOfVehicle != null) {

                            // Convert from Date object to LocalDate.
                            LocalDate arrivalDateNew = arrivalDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
                            LocalDate sellDateNew = null;
                            if (sellDate != null) {
                                sellDateNew = sellDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
                            }
                            // Create new car object (which adds itself to Car.listOfCars)
                            new Car(numbPlate, typeOfVehicle, price, model, colour, mileage, accHistory, tType, arrivalDateNew, sellDateNew);
                        }
                    }



        }


            // Instead of crashing, alert user of error.
            catch(IOException e){
                new Alert(Alert.AlertType.WARNING, "IOException occurred.").showAndWait();
            } catch(NullPointerException e){
                new Alert(Alert.AlertType.WARNING, "No file selected.").showAndWait();
            }
        }