Java入门第二季 答答租车系统

昨天刚看完《Java入门第二季》的视频，凭着自己的有限能力完成了“答答租车系统”。
1.读取用户的输入，并对错误的输入有相应的提示和重新输入。
2.考虑到用户可能一种车租很多辆，每一辆车租用的天数不一样。系统采用先让用户选择租一种车的数量，再选择该种车第N辆的租用天数。最后打印订单。

贴代码：

package com.carrent;
//新建Car 抽象类
public abstract class Car {
    private String type;
    private int price; 

    public String getType() { 
        return type; 
    } 

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

    public int getPrice() { 
        return price; 
    } 

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

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

因为载客量和载货量可能被同时实现，所以将其定义为接口：

package com.carrent;
//载客量
public interface IBusLoad {
    public int getBusLoad();
    public void setBusLoad(int busLoad);
}

package com.carrent;
//载货量
public interface ITrunkLoad {
    public int getTrunkLoad();
    public void setTrunkLoad(int trunkLoad);
}

接着定义三个类，分别继承抽象类Car

package com.carrent;
//客车
public class Bus extends Car implements IBusLoad {
    private int busLoad;

    public Bus(String type, int price, int busLoad){
        this.setType(type);
        this.setPrice(price);
        this.setBusLoad(busLoad);
    }

    @Override
    public int getBusLoad() {
        return busLoad;
    }

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

    @Override
    public String toString() {
        return super.toString() + "\t\t" + "载人：" + this.getBusLoad() + "人";
    } 

}

package com.carrent;
//货车
public class Trunk extends Car implements ITrunkLoad {
    private int trunkLoad;

    public Trunk(String type, int price, int trunkLoad){
        this.setType(type);
        this.setPrice(price);
        this.setTrunkLoad(trunkLoad);
    }

    @Override
    public int getTrunkLoad() {
        return trunkLoad;
    }

    @Override
    public void setTrunkLoad(int trunkLoad) {
        this.trunkLoad = trunkLoad;
    }

    @Override
    public String toString() {
        return super.toString() + "\t\t" + "载货：" + this.getTrunkLoad() + "吨";
    }

}

package com.carrent;
//皮卡车
public class Pickup extends Car implements IBusLoad, ITrunkLoad {
    private int busLoad;
    private int trunkLoad;

    public Pickup(String type, int price, int busLoad, int trunkLoad){
        this.setType(type);
        this.setPrice(price);
        this.setBusLoad(busLoad);
        this.setTrunkLoad(trunkLoad);
    }

    @Override
    public int getTrunkLoad() {
        return trunkLoad;
    }

    @Override
    public void setTrunkLoad(int trunkLoad) {
        this.trunkLoad = trunkLoad;
    }

    @Override
    public int getBusLoad() {
        return busLoad;
    }

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

    @Override
    public String toString() {
        return super.toString() + "\t\t" + "载人：" + this.getBusLoad() + "人" + "\t载货：" + this.getTrunkLoad() + "吨";
    }

}

程序入口：

package com.carrent;
import java.util.List;
import java.util.ArrayList;
import java.util.Scanner;

public class InitCarRent {

    public static void main(String[] args) {
        System.out.println("欢迎使用答答租车系统！");
        for (;;) {
            System.out.println("您是否要租车：1是  0否");
            Scanner in=new Scanner(System.in);
            int choice = 3;
            try{
                choice = in.nextInt();
            }catch(Exception e){
                System.out.println("指令有误！请输入正确的指令。");
                continue;
            }
            if(choice == 0) {
                in.close();
                break;
            }
            else if(choice == 1){
                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（元/天）\t容量");
                // TODO  rentCars(carList);
                List<Car> carList = initCarList();
                int[][] carNumber = selectCar(carList, in);
                printOrder(carList, carNumber);
                System.out.println();
                in.close();
                break;
            }
            else{
                System.out.println("指令有误！请输入正确的指令。");
                continue;
            }
        }
        System.out.println("感谢您使用答答租车系统！");
    }

    public static List<Car> initCarList(){
        List<Car> carList = new ArrayList<Car>();
        carList.add(new Bus("奥迪A4", 500, 4));
        carList.add(new Bus("马自达6", 400, 4));
        carList.add(new Pickup("皮卡雪6", 450, 4, 2));
        carList.add(new Bus("金龙", 800, 20));
        carList.add(new Trunk("松花江", 400, 4));
        carList.add(new Trunk("依维柯", 1000, 20));
        //打印可用车型
        for (int i = 0; i < carList.size(); i++) {
            System.out.println((i+1) + "\t" + carList.get(i).toString());
        }
        return carList;
    }

    public static int[][] selectCar(List<Car> carList, Scanner in){
        int carTypeNumber = carList.size();
        int[][] carNumber = new int[carTypeNumber][3];
        for (int i = 0; i < carTypeNumber; i++) {
            carNumber[i][0] = i + 1;
            //每辆车的数量
            System.out.println("请输入第" + (i+1) + "种车（" + carList.get(i).getType() + "）的数量，没有请输0：");
            try{
                carNumber[i][1] = in.nextInt();
            }catch(Exception e){
                System.out.println("由于您操作异常，自动帮您退出系统。");
                return carNumber;
            }

            if(carNumber[i][1] == 0){
                continue;
            }else{
                //一种车每辆车的租金
                carNumber[i][2] = 0;
                int carRentDay = 0;
                for(int j = 1; j <= carNumber[i][1]; j++){
                    System.out.println("请输入第" + j + "辆车（" + carList.get(i).getType() + "）的天数：");
                    try{
                        carRentDay = in.nextInt();
                    }catch(Exception e){
                        System.out.println("由于您操作异常，自动帮您退出系统。");
                        return carNumber;
                    }

                    if(carRentDay <= 0){
                        j--;
                        System.out.println("请输入一个>=1的数字。");
                        continue;
                    }else{
                        carNumber[i][2] += carRentDay;
                    }
                }
            }
        }
        return carNumber;
    }

    public static void printOrder(List<Car> carList, int[][] carNumber){
        List<Car> selectedCars = new ArrayList<Car>();
        int carTypeNumber = carList.size();
        int[] rental = new int[carTypeNumber];
        int rentalSum = 0;

        System.out.println();
        System.out.println("--------------------------------------");
        System.out.println("您的订单：");
        System.out.println("汽车名称\t数量\t天数\t每日租金\t总租金");

        for(int i = 0; i < carTypeNumber; i++){
            for(int j = 0; j < carNumber[i][1]; j++){
                selectedCars.add(carList.get(i));
                //System.out.println((i+1) + "\t" + selectedCars.get(i).toString());
            }

            rental[i] = carNumber[i][2] * carList.get(i).getPrice();
            rentalSum += rental[i];
            System.out.println(carList.get(i).getType() + "\t" + carNumber[i][1] + "\t" + carNumber[i][2] + "\t" 
             + carList.get(i).getPrice() + "\t" + rental[i]);
        }
        System.out.println("------------------------------------");
        System.out.println("\t\t\t总金额(￥):" + rentalSum);

    }
}

最终效果：