Java入门第二季项目实战——答答租车

定义Car类：

package com.imooc.mika.dadarent;

public class Car {
    private String carName;
    private double price;

    public Car(String carName, double price) {
        this.carName = carName;
        this.price = price;
    }

    public String getCarName() {
        return carName;
    }

    public void setCarName(String carName) {
        this.carName = carName;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return carName + "\t" + price;
    }

}

创建3个继承Car的子类：
客车BusCar ：

package com.imooc.mika.dadarent;

public class BusCar extends Car {

    private int busLoad;

    public BusCar(String carName, double price) {
        super(carName, price);
    }

    public BusCar(String carName, int busLoad, double price) {
        super(carName, price);

        this.busLoad = busLoad;
    }

    public int getBusLoad() {
        return busLoad;
    }

    public void setBusLoad(int busLoad) {
        this.busLoad = busLoad;
    }

    @Override
    public String toString() {
        return super.toString() + "\t" + busLoad + "\t-";
    }
}

货车TrunkCar ：

package com.imooc.mika.dadarent;

public class TrunkCar extends Car {

    private double deadWeight;

    public TrunkCar(String carName, double price) {
        super(carName, price);
    }

    public TrunkCar(String carName, double deadWeight, double price) {
        super(carName, price);
        this.deadWeight = deadWeight;
    }

    public double getDeadWeight() {
        return deadWeight;
    }

    public void setDeadWeight(double deadWeight) {
        this.deadWeight = deadWeight;
    }
    @Override
    public String toString() {
        return super.toString() + "\t-\t" + deadWeight;
    }
}

客货两用PickUpCar ：

package com.imooc.mika.dadarent;

public class PickUpCar extends Car {

    private int busLoad;
    private double deadWeight;

    public PickUpCar(String carName, double price) {
        super(carName, price);
    }

    public PickUpCar(String carName, int busLoad, double deadWeight, double price) {
        super(carName, price);
        this.busLoad = busLoad;
        this.deadWeight = deadWeight;
    }

    public int getBusLoad() {
        return busLoad;
    }

    public void setBusLoad(int busLoad) {
        this.busLoad = busLoad;
    }

    public double getDeadWeight() {
        return deadWeight;
    }

    public void setDeadWeight(double deadWeight) {
        this.deadWeight = deadWeight;
    }

    @Override
    public String toString() {
        return super.toString() + "\t" + busLoad + "\t" + deadWeight;
    }

}

主程序：

package com.imooc.mika.dadarent;

import java.util.HashSet;
import java.util.Scanner;

public class DaDaRent {
    private static Scanner sn = new Scanner(System.in);

    public static void main(String[] args) {

        System.out.println("欢迎使用答答租车系统！");
        boolean quit = false;

        while (!quit) {
            System.out.println("租车请输入数字'1'，退出系统请输入数字'0'");

            switch (inputCommand()) {
            case 0:
                quit = true;
                break;
            case 1:
                rentCars();
                break;
            default:
                System.out.println("命令输入错误！请根据提示输入命令值！");
                break;
            }
        }

        sn.close();
        System.out.println("退出系统~");
    }

    private static void rentCars() {
        // 可选车型初始化
        Car[] carList = initCarList();
        // 打印可选车型信息
        printCarList(carList);
        // 输入租车数量
        int rentCount = setRentCount();
        // 选择具体车型
        Car[] selectCars = selectCars(carList, rentCount);
        // 输入租车天数
        int days = setRentDays();
        // 打印账单
        printBill(selectCars, days);
    }

    private static Car[] initCarList() {
        Car[] carList = new Car[5];
        carList[0] = new TrunkCar("货车1号", 5, 500);
        carList[1] = new TrunkCar("货车2号", 10, 800);
        carList[2] = new BusCar("客车1号", 4, 400);
        carList[3] = new BusCar("客车2号", 20, 1500);
        carList[4] = new PickUpCar("客货两用", 4, 8, 1000);
        return carList;
    }

    private static void printCarList(Car[] carList) {

        System.out.println("可选车型一览表：");
        System.out.println("编号\t车型\t日租金(元)\t载客量(人)\t载重量(吨)");

        for (int i = 0; i < carList.length; i++) {
            System.out.println((i + 1) + "\t" + carList[i].toString());
        }
    }

    private static int setRentCount() {
        int rentCount = 0;
        do {
            System.out.println("请输入租车数量(1-100)：");
            rentCount = inputCommand();
        } while (!(rentCount > 0 && rentCount <= 100));
        return rentCount;
    }

    private static Car[] selectCars(Car[] carList, int rentCount) {

        System.out.println("请输入每辆车辆的编号：");
        Car[] selectCars = new Car[rentCount];
        int carNo = 0;
        for (int i = 0; i < rentCount; i++) {

            do {
                System.out.println("第" + (i + 1) + "辆车的编号(1-" + carList.length + ")：");
                carNo = inputCommand();
            } while (!(carNo > 0 && carNo <= carList.length));

            selectCars[i] = carList[carNo - 1];
        }

        return selectCars;
    }

    private static int setRentDays() {
        int days = 0;
        do {
            System.out.println("请输入租车的天数(1-365)：");
            days = inputCommand();
        } while (!(days > 0 && days <= 365));
        return days;
    }

    private static void printBill(Car[] selectCars, int days) {

        System.out.println("账单：————————————————————————");
        System.out.println("租用车辆数量：" + selectCars.length);
        System.out.println("租用天数：" + days);

        // 计算选择车辆的总载客数、载重量、总租用金额、车型名称
        HashSet<String> carNames = new HashSet<String>();
        int sumBusLoad = 0;
        double sumDeadWeight = 0;
        double sumPrice = 0;

        for (Car car : selectCars) {

            carNames.add(car.getCarName());

            sumPrice += car.getPrice();

            if (car instanceof BusCar)
                sumBusLoad += ((BusCar) car).getBusLoad();

            if (car instanceof TrunkCar)
                sumDeadWeight += ((TrunkCar) car).getDeadWeight();

            if (car instanceof PickUpCar) {
                sumBusLoad += ((PickUpCar) car).getBusLoad();
                sumDeadWeight += ((PickUpCar) car).getDeadWeight();
            }
        }

        System.out.println("总载客数(人)：" + sumBusLoad);
        System.out.println("总载重量(吨)：" + sumDeadWeight);
        System.out.println("总租用金额(元)：" + sumPrice * days);
        System.out.println("租用车辆型号：" + carNames.toString());
        System.out.println("————————————————————————————");
    }

    private static int inputCommand() {
        try {
            return sn.nextInt();
        } catch (Exception e) {
            sn = new Scanner(System.in);
            return -1;
        }
    }
}