答答租车系统-Java面向对象的学习-原创手记-慕课网

定义 2 个接口

载人接口 IMannedCar.java


public interface IMannedCar {
    int mannedNumber();
}

载货接口 ICarryFreight.java


public interface ICarryFreight {
    int carryFreightNumber();
}

定义抽线父类 Car.java，并定义两个抽象方法 name(), rental().


public abstract class Car {
    public abstract String name();
    public abstract int rental();
}

定义三个抽象类，继承 Car.java，并根据不同的需求实现不同的接口

PersonCar，载人汽车抽象类


public abstract class PersonCar extends Car implements IMannedCar {
}

CarryCar，载货汽车抽象类


public abstract class PersonCar extends Car implements IMannedCar {
}

PickupTruck，皮卡抽象类


public abstract class PickupTruck extends Car implements IMannedCar,ICarryFreight {
}

具体不同的汽车，实现不同的类

Audi.java，奥迪A4，载人汽车实现类


public class Audi extends PersonCar {
    @Override
    public int mannedNumber() {
        return 4;
    }

    @Override
    public String name() {
        return "奥迪 A4";
    }

    @Override
    public int rental() {
        return 500;
    }

    @Override
    public String toString() {
        return name() + "  " + rental() + "元/天  载人：" + mannedNumber();
    }
}

Mazada6.java，马自达6，载人汽车实现类


public class Mazada6 extends PersonCar {
    @Override
    public int mannedNumber() {
        return 4;
    }

    @Override
    public String name() {
        return "马自达6";
    }

    @Override
    public int rental() {
        return 400;
    }

    @Override
    public String toString() {
        return name() + "  " + rental() + "元/天  载人：" + mannedNumber();
    }
}

Xue6.java，雪6，皮卡实现类


public class Xue6 extends PickupTruck {
    @Override
    public int mannedNumber() {
        return 4;
    }

    @Override
    public int carryFreightNumber() {
        return 2;
    }

    @Override
    public String name() {
        return "皮卡雪6";
    }

    @Override
    public int rental() {
        return 450;
    }

    @Override
    public String toString() {
        return name() + "  " + rental() + "元/天  载人：" + mannedNumber() + " 载货：" + carryFreightNumber();
    }
}

YiWeiKe.java，依维柯，载货汽车实现类


public class YiWeiKe extends CarryCar {
    @Override
    public int carryFreightNumber() {
        return 20;
    }

    @Override
    public String name() {
        return "依维柯";
    }

    @Override
    public int rental() {
        return 1000;
    }

    @Override
    public String toString() {
        return name() + "  " + rental() + "元/天  载货：" + carryFreightNumber();
    }
}

SongHuaJiang.java，松花江，载货汽车实现类


public class SongHuaJiang extends CarryCar {
    @Override
    public int carryFreightNumber() {
        return 4;
    }

    @Override
    public String name() {
        return "松花江";
    }

    @Override
    public int rental() {
        return 400;
    }

    @Override
    public String toString() {
        return name() + "  " + rental() + "元/天  载货：" + carryFreightNumber();
    }
}

JinLong.java，金龙，载人汽车实现类


public class JinLong extends PersonCar {
    @Override
    public int mannedNumber() {
        return 20;
    }

    @Override
    public String name() {
        return "金龙";
    }

    @Override
    public int rental() {
        return 800;
    }

    @Override
    public String toString() {
        return name() + "  " + rental() + "元/天  载人：" + mannedNumber();
    }
}

PiCar.java，皮卡，皮卡实现类


public class PiCar extends PickupTruck {
    @Override
    public int mannedNumber() {
        return 4;
    }

    @Override
    public int carryFreightNumber() {
        return 5;
    }

    @Override
    public String name() {
        return "皮卡";
    }

    @Override
    public int rental() {
        return 600;
    }

    @Override
    public String toString() {
        return name() + "  " + rental() + "元/天  载人：" + mannedNumber()+" 载货：" + carryFreightNumber();
    }
}

租车系统 RentCar


public class RentCar {

    private List<Car> cars;
    private List<Car> rentCars;

    public void rent() {
        rentCars = new ArrayList<>();
        System.out.println("您可租车的类型及其价目表：");
        showRentCarList();

    }

    private void showRentCarList() {
        cars = new ArrayList<>();
        Car audi = new Audi();
        cars.add(audi);
        Car yiweike = new YiWeiKe();
        Car piCar = new PiCar();
        Car songhuajiang = new SongHuaJiang();
        Car mazada6 = new Mazada6();
        Car xue6 = new Xue6();
        Car jinlong = new JinLong();
        cars.add(piCar);
        cars.add(yiweike);
        cars.add(songhuajiang);
        cars.add(mazada6);
        cars.add(xue6);
        cars.add(jinlong);
        if (cars != null && cars.size() > 0) {
            System.out.println("序号  汽车名称  租金  容量");
            for (int i = 0; i < cars.size(); i++) {
                System.out.println(i + 1 + "   " + cars.get(i).toString());
            }
            int carsNumber = 0;
            boolean isCardNumber = false;
            System.out.println("请输入您要租赁车辆的数量：");
            while (!isCardNumber) {
                try {
                    carsNumber = inNumber();
                    if (carsNumber <= 0) {
                        isCardNumber = false;
                        continue;
                    }
                    isCardNumber = true;
                } catch (ParseErrorException e) {
                    isCardNumber = false;
                    System.out.println("请输入您要租赁车辆的数量：");
                }
            }

            for (int j = 0; j < carsNumber; j++) {
                System.out.println("请输入第" + (j + 1) + "辆车的序号：");
                boolean isSerial = false;
                while (!isSerial) {
                    int serial = 0;
                    try {
                        serial = inNumber();
                    } catch (ParseErrorException e) {
                        isSerial = false;
                        System.out.println("请正确的输入车辆需要");
                        continue;
                    }
                    if (serial <= 0  serial > cars.size()) {
                        System.out.println("请正确的输入车辆需要");
                        isSerial = false;
                        continue;
                    }
                    rentCars.add(cars.get(serial - 1));
                    isSerial = true;
                }

            }
            statisticsCars();
        } else {
            System.out.println("暂时没有可供租赁的车辆！");
            return;
        }

    }

    public int inNumber() throws ParseErrorException {
        Scanner scanner1 = new Scanner(System.in);
        try {
            String trim = scanner1.next().trim();
            return Integer.parseInt(trim);
        } catch (Exception e) {
            throw new ParseErrorException(e.getMessage());
        }
    }

    private void statisticsCars() {
        List<Car> carryName = new ArrayList<>();
        List<Car> personName = new ArrayList<>();
        int manned = 0;
        int carryFreight = 0;
        int rently = 0;
        if (rentCars != null && rentCars.size() > 0) {
            for (int i = 0; i < rentCars.size(); i++) {
                Car car = rentCars.get(i);
                rently += car.rental();
                if (car instanceof PersonCar) {
                    manned += ((IMannedCar) car).mannedNumber();
                    personName.add(car);
                } else if (car instanceof CarryCar) {
                    carryFreight += ((ICarryFreight) car).carryFreightNumber();
                    carryName.add(car);
                } else {
                    manned += ((IMannedCar) car).mannedNumber();
                    carryFreight += ((ICarryFreight) car).carryFreightNumber();
                    carryName.add(car);
                    personName.add(car);
                }
            }
            System.out.println("您租赁了：" + rentCars.size() + "辆车，总金额：" + rently);
            if (carryFreight != 0) {
                System.out.println("总载货量：" + carryFreight);
                System.out.print("车辆类型为：");
                for (Car car : carryName) {
                    System.out.print(car.name() + "  ");
                }
                System.out.println();
            }
            if (manned != 0) {
                System.out.println("总载人量：" + manned);
                System.out.print("车辆类型为：");
                for (Car car : personName) {
                    System.out.print(car.name() + "  ");
                }
                System.out.println();
            }

        } else {
            System.out.println("租赁信息有误");
        }
    }
}

答答租车系统入口：


public class DadaRentCar {

    public static void main(String[] args) {
        System.out.println("欢迎使用答答租车系统：");
        System.out.println("您是否要租车：1-是，0-否");
        boolean isRent = true;
        while (isRent) {
            Scanner scanner = new Scanner(System.in);
            String trim = scanner.next().trim();
            if (trim.equals("1")) {
                RentCar rentCar = new RentCar();
                rentCar.rent();
            } else if (trim.equals("0")) {
                isRent = false;
                System.out.println("再见！");
            } else {
                System.out.println("请输入正确的指令");
            }
        }

    }
}