不知道这样写对不对

//: Vehicle.java
package com.faraj.car_rental;

public class Vehicle {
    public int price;
    public String name;
    public String cargo;
    public String manned;
    public int id;

    public Vehicle(int i, int p, String n) {
        id = i;
        price = p;
        name = n;
    }

    @Override
    public String toString() {
        return name;
    }
}

//: Bus.java
package com.faraj.car_rental;

public class Bus extends Vehicle {
    public Bus(int i,int p, String n, int m) {
        super(i,p, n);
        manned = m + "People";
    }
}

//: Truck.java
package com.faraj.car_rental;

public class Truck extends Vehicle {
    public Truck(int i,int p, String n, int c) {
        super(i,p, n);
        cargo = c + "t";
    }
}

//: Pickup.java
package com.faraj.car_rental;

public class Pickup extends Vehicle {
    public Pickup(int i,int p, String n, int c, int m) {
        super(i,p, n);
        cargo = c + "t & ";
        manned = m + "People";
    }
}

//: Startup.java
package com.faraj.car_rental;

import java.util.Scanner;

public class Startup {
    public static void output(Vehicle vehicle) {
        if (vehicle.name.length() > 8) {
            System.out.print(vehicle.id + "\t" + vehicle.name + "\t" + "$" + vehicle.price + "\t\t");
        } else if (vehicle.name.length() < 4) {
            System.out.print(vehicle.id + "\t" + vehicle.name + "\t\t\t" + "$" + vehicle.price + "\t\t");
        } else {
            System.out.print(vehicle.id + "\t" + vehicle.name + "\t\t" + "$" + vehicle.price + "\t\t");
        }
        if (vehicle.cargo != null) {
            if (vehicle.manned != null) {
                System.out.println(vehicle.cargo + vehicle.manned);
            } else {
                System.out.println(vehicle.cargo);
            }
        } else {
            System.out.println(vehicle.manned);
        }
    }

    public void startSystem() {
        Vehicle[] vehicles = new Vehicle[]{
                new Bus(1, 2000, "Smart Bus", 40),
                new Bus(2, 3000, "Large Bus", 120),
                new Truck(3, 1500, "Van", 15),
                new Truck(4, 3500, "Large Truck", 60),
                new Pickup(5, 2500, "Pickup", 10, 20)
        };
        Scanner scanner = new Scanner(System.in);
        System.out.println("是否进入租车系统？");
        if (scanner.hasNextInt()) {
            int isStart = scanner.nextInt();
            if (isStart == 1) {
                System.out.println("ID\tName\t\tPrice\\Day\tVolume");
                System.out.println("===========================================");
                for (Vehicle vehicle : vehicles) {
                    output(vehicle);
                }
                System.out.println("您需要租几辆车？");
                int num = scanner.nextInt();
                System.out.println("请选择你要租的车的ID");
                int[] vehicleId = new int[num];
                for (int i = 1; i < vehicleId.length + 1; i++) {
                    System.out.println("请输入第" + i + "辆车的Id");
                    vehicleId[i - 1] = scanner.nextInt();
                }
                System.out.println("您需要租多少天");
                int days = scanner.nextInt();
                int sumPrice = 0;
                for (int i = 0; i < vehicleId.length; i++) {
                    sumPrice += vehicles[vehicleId[i] - 1].price;
                    sumPrice *= days;
                }
                System.out.println("++++++++++++++++++++++++++++++");
                System.out.print("您租了 ");
                for (int id : vehicleId) {
                    System.out.print(vehicles[id - 1] + "*");
                    System.out.print(days + "天\t");
                }
                System.out.println();
                System.out.println("您总共需要支付：$" + sumPrice);

            } else {
                System.out.println("已退出程序");
            }

        }
    }

}

//: DriveTest.java
package com.faraj.car_rental;

public class DriveTest {
    public static void main(String[] args) {
        new Startup().startSystem();
    }
}