数组计数器导致非法启动表达式

Question

我有一个类“车辆”，它应该允许使用用户输入的信息保存数组，但是当我尝试使用计数器接受数据时，每个数据条目都有一个唯一的数字它不接受任何超过[on vehicle vehiclearray[totalcount] = new vehiclearray(count,licence,date,value,colour);我相对较新的java并且这个问题困扰了我，任何帮助都会受到赞赏。

这是整个代码，问题在submenu1下。

import java.util.Scanner;

class main
{
    public static void main(String[] args)
    {
        Scanner input = new Scanner (System.in);
        int option = menu();
        int totalcount = submenu1.totalcount;
        int carcount = submenu1.carcount;
        int bikecount = submenu1.bikecount;
        vehicle vehiclearray[] = new vehiclearray[100];

        if (option == 1)
            submenu1(vehiclearray);
        else if (option ==2)
            submenu2(totalcount, vehiclearray);
        else if (option ==3)
            submenu3(totalcount, carcount, bikecount,museumbike, museumcar);
        else if (option ==4)
            submenu4(carcount, museumcar);
        else if (option ==5)
            submenu5(bikecount, museumbike);
        else if (option ==6)
            System.out.println("Thank you for using this program");
        else
            System.out.println("Invalid selection, please try again.");
    }
}

class menusystem
{
    public static int menu()
    {
        Scanner input = new Scanner (System.in);
        int option = 0;

        System.out.println("Please select an option");
        System.out.println("=======================");
        System.out.println("1. Add a vehicle to the collection");
        System.out.println("2. List vehices manufactured by a specifit year");
        System.out.println("3. List all vehcles of a certain engine size or more");
        System.out.println("4. list all cars");
        System.out.println("5. List all bikes");
        System.out.println("6. Exit");
        option = input.nextInt();
        return option;
    }

    public static int submenu1(vehicle vehiclearray[])
    {
        Scanner input = new Scanner (System.in);
        String suboption1;
        int totalcount = carcount = bikecount = 1;

        System.out.println("Is the vehicle a car or a bike? (exit to close)");
        suboption1 = input.next();
        while(!suboption1.equalsIgnoreCase("exit"))
        {
            if (suboption1.equalsIgnoreCase("car"))
            {
                vehicle.id=count;
                System.out.println("Please enter the licence, manufacture year, car value and colour of the car");
                vehicle vehiclearray[totalcount] = new vehiclearray(count,licence,date,value,colour);
                System.out.println("Please enter the number of doors, number of seats, engine type (petrol or deisol) and engine size in litres");
                museumcar museumcar[carcount] = new museumcar(cardoors,seats,enginetype,carenginesize);
                totalcount++;
                carcount++;

            }
            else if (suboption1.equalsIgnoreCase("bike"))
            {
                System.out.println("Please enter the licence, manufacture year, car value and colour of the bike");
                vehicle vehiclearray[totalcount] = new vehiclearray(licence,date,value,colour);
                vehicle.id=count;
                System.out.println("Please enter the bike type (sports, tourer or trials) and engine size in cc");
                museumbike museumbike[bikecount] = new museumbike(type,bikeenginesize);
                totalcount++;
                bikecount++;
            }
            else
                System.out.println("Please enter a valid entry.");

                System.out.println("Is the vehicle a car or a bike? (exit to close)");
                suboption1 = input.next();
                return bikecount;
                return carcount;
                return totalcount;
        } 
    }

    public static void submenu2(int totalcount, vehicle vehiclearray[])
    {
        Scanner input = new Scanner (System.in);
        int desiredyear = 0;
        int count = 1;

        System.out.println("What vehicle manufacture date do you want to see?");
        desiredyear = input.nextInt();
        for (count = 1; count <= totalcount; count++)
        {
            if (vehiclearray[totalcount].getdate == desiredyear)
                System.out.println(vehiclearray[totalcount] +" id : "+ vehiclearray[totalcount].getlicence(), +" licence : "+ vehiclearray[totalcount].getdate(), +" date : "+ vehiclearray[totalcount].getvalue(), +" value : "+ vehiclearray[totalcount].getcolour() +" colour:");
            else
                System.out.println(vehiclearray[totalcount] +" does not match the desired manufacture year");
        }
    }

    public static void submenu3(int totalcount, int carcount, int bikecount, museumbike museumbike[], museumcar museumcar[])
    {
        Scanner input = new Scanner (System.in);
        double desiredsize = 0;
        int count = 1;

        System.out.println("What vehicle size or more do you want to see?");
        desiredsize = input.nextDouble();
        for (count = 1; count <= totalcount; count++)
        {
            if (desiredsize >=0 && desiredsize <=100)
            {
                if (museumcar[carcount].getcarenginesize >= desiredsize)
                    System.out.println(museumcar[carcount].getcardoors(), +(" doors : ")+ museumcar[carcount].getseats(), +(" seats : ")+ museumcar[carcount].getenginetype(), +(" : ")+ museumcar[carcount].getcarenginesize() +("ltrs"));
                else
                    System.out.println("This car has a lower engine size then the desiredsize");
            }
            else if (desiredsize >=100)
                System.out.println(museumbike[bikecount].gettype(), +(" : ")+ museumbike[bikecount].getbikeenginesize() +("cc"));
        }
    }

    public static void submenu4(int carcount, museumcar museumcar[])
    {
        int count = 1;

        for (count = 1; count <= museumcar[carcount]; count++)
        {
            System.out.println(museumcar[carcount].getcardoors(), +(" doors : ")+ museumcar[carcount].getseats(), +(" seats : ")+ museumcar[carcount].getenginetype(), +(" : ")+ museumcar[carcount].getcarenginesize() +("ltrs"));
        }
    }

    public static void submenu5(int bikecount, museumbike museumbike[])
    {
        int count = 1;

        for (count = 1; count <= museumbike[bikecount]; count++)
        {
            System.out.println(("bike id:")+ museumbike[bikecount].gettype(), +(" : ")+ museumbike[bikecount].getbikeenginesize() +("cc"));
        }
    }
}

class vehicle
{
    private int carid;
    private String licence;
    private int date;
    private Double value;
    private String colour;


    vehicle (int i,String l, int d, double v, String c)
    {
        id = i;
        licence = l;
        date = d;
        value = v;
        colour = c;     
    }
    int getid()
    {
        return id;
    }

    String getlicence()
    {
        return licence;
    }

    int getdate()
    {
        return date;
    }

    Double getvalue()
    {
        return value;
    }

    String getcolour()
    {
        return colour;
    }
}

class museumcar extends vehicle
{
    private int cardoors;
    private int seats;
    private String enginetype;
    private Double carenginesize;


    museumcar (int cd, int s, String et, Double ces)
    {
        super (i, l, d, v, c);
        cardoors = cd;
        seats = s;
        enginetype = et;
        carenginesize = es;     
    }

    int getcardoors()
    {
        return cardoors;
    }

    int getseats()
    {
        return seats;
    }

    String getenginetype()
    {
        return enginetype;
    }

    Double getcarenginesize()
    {
        return carenginesize;
    }
}

class museumbike extends vehicle
{
    private String type;
    private Double bikeenginesize;  

    museumbike (String t, Double bes)
    {
        super (i, l, d, v, c);
        type = t;
        bikeenginesize = bes;       
    }

    String gettype()
    {
        return type;
    }

    Double getbikeenginesize()
    {
        return bikeenginesize;
    }
}

Answer 1

没有cararray课程，所以你不能new vehiclearray[...]，而应该new vehicle[...]。

例如，这行代码不合法​​：

vehicle vehiclearray[] = new vehiclearray[100];

但这是：

vehicle vehiclearray[] = new vehicle[100];

一般来说，我认为大多数声明我们的变量与类上的数组括号而不是变量：

vehicle[] vehiclearray = new vehicle[100];

虽然你的方式是合法的（如果你创建了正确的数组对象声明）。

附加说明：

• 您的类名应以大写字母开头，以符合Java命名约定，以便其他人（我们！）可以更好地理解您的代码。
• 如果您有问题并且您的代码没有编译，您应该在问题中发布任何和所有完整的编译器错误消息，并指出代码中的哪些行导致错误。