Java第二季：答答租车系统

1 思想

 1、
    创建两个接口（载客接口IPeopleCar），（载货接口ICargoCar）、一个抽象父类
    Car（属性为：车型，名字，价格，载人量，载货量）；
    其中两个接口本次没有具体方法，为以后扩展使用。`

 2、
    实现-货车类 extends 父类Car implement 载货接口：ICargoCar；
    实现-客车类 extends 父类Car implement 载客接口：IPeopleCar；
    实现-皮卡类 extends 父类Car implement 载客和货接口：ICargoCar和ICargoCar；

 3、
    租车系统类RentCar：一维数组 实例化 卡车对象、客车对象 和 皮卡对象；
    客户选车、分类汇总车辆后，输出租车明细与总价。

2 代码实现

//Car.java

package com.wzq.rentcar;

public abstract class Car {

    public String name;
    public double price;
    public float peopleValue;
    public float cargoValue;
    public int flag;//标记车型，0:people,1:cargo,2:pick-up
    public Car(){}
}

//IPeopleCar.java

package com.wzq.rentcar;

public interface IPeopleCar {

}

//ICargoCar.java
package com.wzq.rentcar;

public interface ICargoCar {

}

//CargoCar.java
package com.wzq.rentcar;

public class CargoCar extends Car implements ICargoCar {

    public CargoCar(int flag,String name,double price,float cargoValue) {
        // TODO Auto-generated constructor stub
        this.flag = 1;
        this.name = name;
        this.price = price;
        this.cargoValue = cargoValue;
    }
}

//PickUp .java
package com.wzq.rentcar;

public class PickUp extends Car implements ICargoCar, IPeopleCar {

    public PickUp(int flag,String name,double price,float peopleValue,float cargoValue) {
        // TODO Auto-generated constructor stub
        this.flag = 2;
        this.name = name;
        this.price = price;
        this.peopleValue = peopleValue;
        this.cargoValue = cargoValue;
    }
}

//PeopleCar .java
package com.wzq.rentcar;

public class PeopleCar extends Car implements IPeopleCar {

    public PeopleCar(int flag,String name,double price,float peopleValue) {
        // TODO Auto-generated constructor stub
        this.flag = 0;
        this.name = name;
        this.price = price;
        this.peopleValue = peopleValue;
    }

}

//RentCar .java
package com.wzq.rentcar;

import java.util.*;

public class RentCar {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Car car[] = new Car[6];

        car[0] = new PeopleCar(0, "奥迪A4", 500, 4);
        car[1] = new PeopleCar(0, "马自达6", 400, 4);
        car[2] = new PickUp(2, "皮卡雪6", 450, 4, 2);
        car[3] = new PeopleCar(0, "金龙", 800, 20);
        car[4] = new CargoCar(1, "松花江", 400, 4);
        car[5] = new CargoCar(1, "依维柯", 1000, 20);

        System.out.println("欢迎使用嗒嗒租车系统");
        System.out.println("您是否要租车：1是 0否");

        @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in);
        int in = sc.nextInt();
        if (1 == in) {
            System.out.println("您可租车的类型及其价目表：");
            System.out.println("序号\t汽车名称\t租金\t\t容量");
            int number;
            for (int i = 0; i < 6; i++) {
                number = i + 1;
                if (car[i].flag == 0) {
                    System.out.println(
                            number + "\t" + car[i].name + "\t" + car[i].price + "元/天\t载人：" + car[i].peopleValue + "人");
                } else if (car[i].flag == 1) {
                    System.out.println(
                            number + "\t" + car[i].name + "\t" + car[i].price + "元/天\t载货：" + car[i].cargoValue + "吨");
                } else {
                    System.out.println(number + "\t" + car[i].name + "\t" + car[i].price + "元/天\t载人："
                            + car[i].peopleValue + "人，载货：" + car[i].cargoValue + "吨");
                }
            }

            System.out.print("请输入本次租车的数量：");
            int cartotal = sc.nextInt();
            int[] carList = new int[6]; // 保存车子的序号

            for (int i = 1; i <= cartotal; i++) {
                System.out.print("请输入第" + i + "辆车的序号:");

                int carNumer = sc.nextInt();
                carList[i - 1] = carNumer;
            }
            System.out.print("请输入租车天数：");
            int dayNumber = sc.nextInt();

            System.out.println("您的账单：");

            System.out.print("***可载人的车有：");

            int totalPeople = 0;// 标记总人数
            int totalCargo = 0;// 标记总货物量
            double money = 0;// 标记总钱数

            for (int i = 0; i < cartotal; i++) {
                if (car[carList[i] - 1].flag == 0  car[carList[i] - 1].flag == 2) {
                    totalPeople += car[carList[i] - 1].peopleValue;
                    System.out.print(car[carList[i] - 1].name + "  ");
                }
            }
            System.out.println("\n\t\t共载人：" + totalPeople + "人");

            System.out.print("***可载货的车有：");

            for (int i = 0; i < cartotal; i++) {
                if (car[carList[i] - 1].flag == 1  car[carList[i] - 1].flag == 2) {
                    totalCargo += car[carList[i] - 1].cargoValue;
                    System.out.print(car[carList[i] - 1].name + "  ");
                }
                money += car[carList[i] - 1].price;
            }
            System.out.println("\n\t\t共载货：" + totalCargo + "吨");
            System.out.print("***租车总金额为：" + money * dayNumber);

        } else {
            System.out.println("欢迎您的到来，下次再会！");
        }
    }

}

## 3 运行截图 ##
![图片描述][1]

![图片描述][2]

  [1]: http://img.mukewang.com/579ce4930001b4ff07800241.png
  [2]: http://img.mukewang.com/579ce4a90001063c07850592.png