Question

我想从扫描仪输入创建arraylist。这是摩托车租赁系统。请帮助:)我是绝对的初学者：D

我正在尝试创建这样的表：（日期，日期，名称，licenceID）

2016-08-09,2016-08-20，Smith先生，1234567
2016-08-05,2016-08-06，Mr。Jackson，6435434

这是我的代码：

public class Launcher{

    public static void main(String[] args) throws IOException {

        ArrayList<Launcher> reservationlist = new ArrayList<>();
        reservationlist.add(2016-08-09, 2016-08-20, Mr Smith, 1234567; // there is an error

        Helper.welcomeMessage();
        char choice, ignore;

        for (;;) {
            do {
                Helper.showMenu();

                choice = (char) System.in.read();
                do {
                    ignore = (char) System.in.read();
                } while (ignore != '\n');
            } while (choice < '1' | choice > '5' & choice != 'q');
            if (choice == 'q') {
                break;
            }

           Orders order = new Orders();

            switch (choice) {
                case '1': // Get information about company
                    Helper.aboutUs();
                    break;
                case '2': // List of our motorcycles (enum)
                    System.out.println("Price per 1 day:  PREMIUM 500, GOLD 500, BASIC 500");
                    for (Prices pricelist : Prices.values())
                        System.out.printf("%s\t%s\n", pricelist.getTitle(), pricelist);
                    break;
                case '3': // Make a reservation
                    Scanner hp = new Scanner(System.in);
                    Orders reservation = new Orders();

                    System.out.println("Type initial date:");
                    reservation.initialDate = hp.next();

                    System.out.println("Type final date:");
                    reservation.finalDate = hp.next();

                    System.out.println("Type your first name and last name:");
                    reservation.name = hp.next();

                    System.out.print("Type your driving licence ID:");
                    reservation.drivingLicenceID = hp.next();

                    System.out.println("\n\n Reservation completed " + reservation.name + "\n Thanks for your reservation\n");
                    break;

                    reservationlist.add(reservation.initialDate, reservation.finalDate, reservation.name, reservation.drivingLicenceID));  // there is an error

                case '4': // Check availability of motorcycles
                    System.out.println("");
                    break;
                case '5': // Contact with us
                    Helper.contact();
                    break;
            }


public class Orders {

        String initialDate;
        String finalDate;
        String name;
        String drivingLicenceID;

    public Orders(String initialDate, String finalDate, String name, String drivingLicenceID) {
        this.initialDate = initialDate;
        this.finalDate = finalDate;
        this.name = name;
        this.drivingLicenceID = drivingLicenceID;
    }

    public Orders() {}

    @Override
    public String toString() {
        return "Orders{" +
                "initialDate='" + initialDate + '\'' +
                ", finalDate='" + finalDate + '\'' +
                ", name='" + name + '\'' +
                ", drivingLicenceID=" + drivingLicenceID +
                '}';
    }

    public void setInitialDate(String initialDate) {
        this.initialDate = initialDate;
    }
    public void setFinalDate(String finalDate) {
        this.finalDate = finalDate;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setDrivingLicenceID(String drivingLicenceID) {
        this.drivingLicenceID = drivingLicenceID;
    }
}

Answer 1

我想你试图实现的是这个：

.ToUpper()

而不是

List<Orders> reservationlist = new ArrayList<>();
reservationlist.add(new Orders("2016-08-09", "2016-08-20", "Mr Smith", "1234567"));

而且：

ArrayList<Launcher> reservationlist = new ArrayList<>();
reservationlist.add(2016-08-09, 2016-08-20, Mr Smith, 1234567; // there is an error

而不是

reservationlist.add(reservation);

Answer 2

除Nicolas解释的内容外，另外一个明显的语法错误如下：

while (choice < '1' | choice > '5' & choice != 'q');

您错误地实施了conditional operators。条件OR语法为||，而AND的语法为&&。

另外，请阅读'How do I ask a good question?'。

从扫描仪到arraylist

2 个答案: