一、技术要点

• 面向对象
• 继承
• 条件判断

二、运行效果

三、代码实现

1、Car类

package CarRentSystem.entity;

/**
 * 父类：汽车类
 */
public class Car {
    private String id; // 车牌号
    private String type; // 品牌
    private int dayMoney; // 日租金

    public Car() {
    }

    public Car(String id, String type, int dayMoney) {
        this.id = id;
        this.type = type;
        this.dayMoney = dayMoney;
    }

    // 计算总租金的方式
    public double getMoney(int days) {
        double money = this.getDayMoney() * days;
        return money;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public int getDayMoney() {
        return dayMoney;
    }

    public void setDayMoney(int dayMoney) {
        this.dayMoney = dayMoney;
    }

    @Override
    public String toString() {
        return "Car{" +
                "id='" + id + ''' +
                ", type='" + type + ''' +
                ", dayMoney=" + dayMoney +
                '}';
    }
}

2、Bus类

package CarRentSystem.entity;

/**
 * 子类：客车类
 */
public class Bus extends Car {
    private int seatCount; // 特有属性：座位数

    public Bus() {
    }

    public Bus(String id, String type, int dayMoney, int seatCount) {
        super(id, type, dayMoney);
        this.seatCount = seatCount;
    }

    // 重写计算总租金的方式
    @Override
    public double getMoney(int days) {
        double money = this.getDayMoney() * days;
        // 计算折扣
        if (days >= 150) {
            money *= 0.6;
        } else if (days >= 30) {
            money *= 0.7;
        } else if (days >= 7) {
            money *= 0.8;
        } else if (days >= 3) {
            money *= 0.9;
        }
        return money;
    }

    public int getSeatCount() {
        return seatCount;
    }

    public void setSeatCount(int seatCount) {
        this.seatCount = seatCount;
    }

    @Override
    public String toString() {
        return "Bus{" + super.toString() +
                "seatCount=" + seatCount +
                '}';
    }
}

3、Saloon类

package CarRentSystem.entity;

/**
 * 子类：轿车类
 */
public class Saloon extends Car {

    private String typeNum; // 特有属性：型号

    public Saloon() {
    }

    public Saloon(String id, String type, int dayMoney, String typeNum) {
        super(id, type, dayMoney);
        this.typeNum = typeNum;
    }

    // 重写计算总租金的方式
    @Override
    public double getMoney(int days) {
        double money = this.getDayMoney() * days;
        // 计算折扣
        if (days >= 150) {
            money *= 0.66;
        } else if (days >= 30) {
            money *= 0.77;
        } else if (days >= 7) {
            money *= 0.88;
        }
        return money;
    }

    public String getTypeNum() {
        return typeNum;
    }

    public void setTypeNum(String typeNum) {
        this.typeNum = typeNum;
    }

    @Override
    public String toString() {
        return "Saloon{" + super.toString() +
                "typeNum='" + typeNum + ''' +
                '}';
    }
}

4、主程序类

package CarRentSystem.test;

import CarRentSystem.entity.Bus;
import CarRentSystem.entity.Saloon;

import java.util.Scanner;

public class CarSystem {
    public static void main(String[] args) {
        System.out.println("👏👏👏👏👏欢迎使用秋名山汽车租赁系统👏👏👏👏👏");
        System.out.println("1、舒适轿车🚗    2、多座客车🚐");
        Scanner scanner = new Scanner(System.in);
        System.out.print("请选择您要租赁的汽车类型：");
        int typeNum = scanner.nextInt();

        if (typeNum == 1) { // 租赁轿车
            Saloon saloon = new Saloon();
            System.out.print("请选择您要租赁的汽车品牌：（1.别克 2.宝马）");
            int pingNum2 = scanner.nextInt();

            if (pingNum2 == 1) {
                System.out.print("请选择您要租赁的汽车类型：（1.林荫大道 2.GL8）");
            } else if (pingNum2 == 2) {
                System.out.print("请选择您要租赁的汽车类型：（1.X8 2.550i）");
            }
            int seatNum2 = scanner.nextInt();

            System.out.print("请选择您要租赁的天数：");
            int dayNum2 = scanner.nextInt();
            if (pingNum2 == 1 && seatNum2 == 1) {
                saloon.setDayMoney(300);
                saloon.setId("京A12345");
                saloon.setType("别克");
                saloon.setTypeNum("林荫大道");
                System.out.println("分配给您的汽车牌号是：" + saloon.getId());
            } else if (pingNum2 == 1 && seatNum2 == 2) {
                saloon.setDayMoney(300);
                saloon.setId("京A67890");
                saloon.setType("别克");
                saloon.setTypeNum("GL8");
                System.out.println("分配给您的汽车牌号是：" + saloon.getId());
            } else if (pingNum2 == 2 && seatNum2 == 1) {
                saloon.setDayMoney(300);
                saloon.setId("京B98765");
                saloon.setType("宝马");
                saloon.setTypeNum("X8");
                System.out.println("分配给您的汽车牌号是：" + saloon.getId());
            } else if (pingNum2 == 2 && seatNum2 == 2) {
                saloon.setDayMoney(300);
                saloon.setId("京B43210");
                saloon.setType("宝马");
                saloon.setTypeNum("550i");
                System.out.println("分配给您的汽车牌号是：" + saloon.getId());
            }
            System.out.println("您需要支付的租赁费用是：" + saloon.getMoney(dayNum2) + "元");
            System.out.println("您租赁的汽车信息为：" + saloon.toString());
        } else if (typeNum == 2) { // 租赁客车
            Bus bus = new Bus();
            System.out.print("请选择您要租赁的汽车品牌：（1.五菱宏光 2.金杯）");
            int pingNum1 = scanner.nextInt();
            System.out.print("请选择您要租赁的座位数：（1.8座 2.12座）");
            int seatNum1 = scanner.nextInt();
            System.out.print("请选择您要租赁的天数：");
            int dayNum1 = scanner.nextInt();

            if (pingNum1 == 1 && seatNum1 == 1) {
                bus.setDayMoney(800);
                bus.setId("京A66666");
                bus.setType("五菱宏光");
                bus.setSeatCount(8);
                System.out.println("分配给您的汽车牌号是：" + bus.getId());
            } else if (pingNum1 == 1 && seatNum1 == 2) {
                bus.setDayMoney(1500);
                bus.setId("京A88888");
                bus.setType("五菱宏光");
                bus.setSeatCount(12);
                System.out.println("分配给您的汽车牌号是：" + bus.getId());
            } else if (pingNum1 == 2 && seatNum1 == 1) {
                bus.setDayMoney(800);
                bus.setId("京A66666");
                bus.setType("金杯");
                bus.setSeatCount(8);
                System.out.println("分配给您的汽车牌号是：" + bus.getId());
            } else if (pingNum1 == 2 && seatNum1 == 2) {
                bus.setDayMoney(1500);
                bus.setId("京A66666");
                bus.setType("金杯");
                bus.setSeatCount(12);
                System.out.println("分配给您的汽车牌号是：" + bus.getId());
            }
            System.out.println("您需要支付的租赁费用是：" + bus.getMoney(dayNum1) + "元");
            System.out.println("您租赁的汽车信息为：" + bus.toString());
        }
    }
}