慕课网 - 答答租车系统（Java）

项目需求：

基本界面需求：

and:

最后是把账单打印出来：

---

个人代码实现

基本思路：考虑到车辆之间的共性，设置一个父类Car, 子类MannedCar(载人), Truck(载货)，BothCary(既载人又载货)，三者继承父类Car的price, name属性, getName()方法, 同时重写getPersonNum, getGoodsNum方法。

Car.java:

package Car;

public abstract class Car {
    protected int price;
    protected String name;
    protected int getPrice() {
        return price;
    }
    protected String getName() {
        return name;
    }
    public int getPersonNum() {
        // TODO Auto-generated method stub
        return 0;
    }
    public int getGoodsNum() {
        // TODO Auto-generated method stub
        return 0;
    }

}

MannedCar.java:

package Car;

public class MannedCar extends Car {
    private int personNum;

    public MannedCar() {
        this.personNum = 0;
        this.price = 0;
        this.name = "";
    }

    public MannedCar(int personNum, int price, String name) {
        this.personNum = personNum;
        this.price = price;
        this.name = name;
    }

    @Override
    public int getPersonNum() {
        return personNum;
    }
}

Truck.java:

package Car;

public class Truck extends Car{
    private int goodsNum;

    public Truck() {
        this.price = 0;
        this.goodsNum = 0;
        this.name = "";
    }

    public Truck(int price, int goodsNum, String name) {
        this.price = price;
        this.goodsNum = goodsNum;
        this.name = name;
    }

    @Override
    public int getGoodsNum() {
        return goodsNum;
    }
}

BothCarry.java:

package Car;

public class BothCarry extends Car {
    private int personNum;
    private int goodsNum;

    public BothCarry() {
        this.personNum = 0;
        this.goodsNum = 0;
        this.name = "";
        this.price = 0;
    }

    public BothCarry(int price, int personNum, 
            int goodsNum, String name) {
        this.personNum = personNum;
        this.goodsNum = goodsNum;
        this.price = price;
        this.name = name;
    }

    public int getPersonNum() {
        return personNum;
    }

    public int getGoodsNum() {
        return goodsNum;
    }
}

系统：
CarSystem.java:

package Car;

import java.util.Scanner;
import java.util.ArrayList;

public class CarSystem {

    private static String goodByeInfo = "欢迎再次使用本系统，再见！"; 
    private static int dayBorrow;

    public static void beginSystem() {
        CarSystem.SystemWelcome();
        Scanner scanner = new Scanner(System.in);
        String userCommand = scanner.next();


        switch(userCommand){
        case "1":
            CarSystem.getUserInput();
            break;
        case "0":
            System.out.println(goodByeInfo);
            break;
        default:
            System.out.println("输入错误..End running..");
            System.exit(0);
            break;
        }
    }

    public static void SystemWelcome() {
        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");
    }

    public static void getUserInput() {
        int numCarBorrow = 0;
        ArrayList carList = new ArrayList(6);
        carList.add(new MannedCar(4,500,"奥迪A4"));
        carList.add(new MannedCar(4,400,"马自达6"));
        carList.add(new BothCarry(450,4,2,"皮卡雪6"));
        carList.add(new MannedCar(20,800,"金龙"));
        carList.add(new Truck(400,4,"松花江"));
        carList.add(new Truck(1000,20,"依维河"));

        System.out.println("请输入您要租汽车的数量:");
        Scanner sr = new Scanner(System.in);

        numCarBorrow = sr.nextInt();

        int[] carNumList = new int[numCarBorrow];
        for(int i=0;iout.println("请输入第" + (i+1) + "辆车的序号:");
            if (sr.hasNext()) {
                carNumList[i] = sr.nextInt();
            }
        }
        System.out.println("请输入租车天数:");
        if (sr.hasNext()) {
            dayBorrow = sr.nextInt();
        }
        sr.close();

        StringBuilder manned = new StringBuilder();
        int numOfManned = 0;
        StringBuilder goods = new StringBuilder();
        int numOfGoods = 0;
        int totalCost = 0;

        for(int i = 0;i < carNumList.length;i++) {
            if(carNumList[i]>0 && carNumList[i] < 3 || carNumList[i]==4) {
                manned.append("    ");
                manned.append(carList.get(carNumList[i]-1).getName());
                numOfManned += carList.get(carNumList[i]-1).getPersonNum();
            }
            else if(carNumList[i]==3) {
                manned.append("    ");
                manned.append(carList.get(carNumList[i]-1).getName());
                goods.append("    ");
                goods.append(carList.get(carNumList[i]-1).getName());
                numOfManned += carList.get(carNumList[i]-1).getPersonNum();
                numOfGoods += carList.get(carNumList[i]-1).getGoodsNum();
            }
            else {
                goods.append("    ");
                goods.append(carList.get(carNumList[i]-1).getName());
                numOfGoods += carList.get(carNumList[i]-1).getGoodsNum();
            }
            totalCost += carList.get(carNumList[i]-1).getPrice();
        }
        //Output
        System.out.println("您的账单:\n***可载人的车有:");
        System.out.println(manned + "    共载人: " + numOfManned); 
        System.out.println("***载货的车有:\n" + goods + "    共载货 : " + numOfGoods + "吨");
        System.out.println("***租车总价格: " + totalCost * dayBorrow + "元");

    }

}

主程序:

package Car;

public class CarSystemTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        CarSystem.beginSystem();
    }

}

运行结果：