java第二季：答答租车系统实现

写完后后来又重新修改了一遍，大概能反映现阶段的水平吧
要继承的父类：

package com.imooc;

public class Car {
     int id;
     String name;
     int people;
     double weight;
     double price;
    //设置一个布尔值，表示车是否可租，默认可租，如果车被租出去，用false表示不可租
     boolean rent=true;
    public double getPrice(){
        return price;
    }
    //改变车辆租借状态
    public void setRent(boolean rent){
        this.rent=rent;
    }
    //为了后面主函数里更加简洁，这里增加getMessage方法
    public void getMessage(){
        System.out.println(id+"\t"+name+"\t"+price+"元/天 \t"+"载人："+people+"人  "+"  载货"+weight+"吨");
    }
}

载人客车类：

package com.imooc;

public class PeopleCar extends Car {
    public PeopleCar(int id,String name,int people,double price){
        this.id=id;
        this.name=name;
        this.people=people;
        this.price=price;
    }
    //增加一个获取载客人数的方法
    public int getPeople(){
        return people;
    }
}

载货货车类

package com.imooc;

public class CargoCar extends Car {
    public CargoCar(int id,String name,double weight,double price){
        this.id=id;
        this.name=name;
        this.weight=weight;
        this.price=price;
    }
    //针对货车增加获得载重量的方法
    public double getWeight(){
        return weight;
    }
}

两用车类

package com.imooc;

public class TwoCar extends Car {
    public TwoCar(int id,String name,int people,double weight,double price){
        this.id=id;
        this.name=name;
        this.people=people;
        this.weight=weight;
        this.price=price;
    }
    //客货两用车同时具有获得载客数和载重数的方法
    public int getPeople(){
        return people;
    }
    public double getWeight(){
        return weight;
    }
}

主函数所在类：

package com.imooc;
import java.util.Scanner;
public class RentCar {
    public static void main(String[] args){
        //0，输入车辆信息，存入数组中
        Car car1=new PeopleCar(1,"奥迪A4",4,500.0);
        Car car2=new PeopleCar(2,"马自达6",4,400.0);
        Car car4=new PeopleCar(4,"金龙",20,800.0);
        Car car5=new CargoCar(5,"松花江",4.0,400.0);
        Car car6=new CargoCar(6,"依维柯",20.0,1000.0);
        Car car3=new TwoCar(3,"皮卡雪6",4,2.0,450.0);
        //将引用的车辆类型存入cars数组中，感觉使用map类型更好，用id作为键，但我不会
        Car[] cars={car1,car2,car3,car4,car5,car6};
        //1，租车前的互动，打印信息，接受输入
        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");
        Scanner input=new Scanner(System.in);
        int num=input.nextInt();
        if(num==1){
            System.out.println("");
        }else{
            System.out.println("您将退出答答租车系统");
        }
        //2，展示可租汽车信息，如果车辆rent属性为真，表示可租赁。
        //另外，如果某种车不具备某种属性，我们将其值表示为0
        System.out.println("您可租车的类型及价目表：");
        System.out.println("序号 \t汽车名称 \t租金\t 容量 ");
        for(Car each:cars){
            if(each.rent==true){
                each.getMessage();
            }
        }
        //3，与租车者进行互动

        System.out.println("请输入要租汽车的数量");
        int rent_num=input.nextInt();
        //创建变量来存放总载人数，载货数，总价格
        int peoplesum=0;
        double weightsum=0.0;
        double pricesum=0.0;
        //定义两个字符串变量 来存放已选择车辆名字信息，其实使用列表或集合更好，但我还不会
        String peoplecarname="";
        String cargocarname="";
        for(int i=1;i<=rent_num;i++){
            System.out.println("请输入第"+i+"辆车的序号：");
            int id=input.nextInt();
            //因为id与数组索引的内在关系，故像下面这么写，否则就要遍历数组来匹配了
            //修改该车租赁状态，改为不可租
            cars[id-1].setRent(false);
            pricesum+=cars[id-1].getPrice();
            if(cars[id-1] instanceof PeopleCarcars[id-1] instanceof TwoCar){
                peoplecarname+=cars[id-1].name+"\t";
                peoplesum+=cars[id-1].people;
            }
            if(cars[id-1] instanceof CargoCarcars[id-1] instanceof TwoCar){
                cargocarname+=cars[id-1].name+"\t";
                weightsum+=cars[id-1].weight;
            }
        }
        System.out.println("请输入要租车的天数：");
        int day=input.nextInt();
        pricesum=pricesum*day;
        System.out.println("您的帐单：");
        System.out.println("***可载人的车有：");
        System.out.print(peoplecarname);
        System.out.println("共载人："+peoplesum+"人");
        System.out.println("***载货的车有：");
        System.out.print(cargocarname+"共载货"+weightsum+"吨");
        System.out.println("租车总价格为"+pricesum+"元");
    }
}

有什么看法和意见，欢迎共同探讨。