1.父类 Car.java

package com.car;
public abstract class Car {
    String name;
    double price;
    int member;
    int rl;
}

2.子类1 Car1.java

package com.car;

public class Car1 extends Car {
    //只载人的车型
    public Car1(String name,double price,int member) {
        this.name=name;
        this.price=price;
        this.member=member;
    }

    public String toString() {
        return this.name+"\t"+this.price+"元/天\t"+"载人:"+this.member+"人";
    }
}

3.子类2 Car2.java

package com.car;

public class Car2 extends Car {
    //可载货+载人的车型
    public Car2(String name,double price,int member,int rl) {
        this.name=name;
        this.price=price;
        this.member=member;
        this.rl=rl;
    }

    public String toString() {
        return this.name+"\t"+this.price+"元/天\t"+"载人:"+this.member+"人"+" 载货:"+this.rl+"吨";
    }
}

4.子类3 Car3.java

package com.car;

public class Car3 extends Car {
    //只载货的车型
    public Car3(String name,double price,int rl) {
        this.name=name;
        this.price=price;
        this.rl=rl;
    }

    public String toString() {
        return this.name+"\t"+this.price+"元/天\t"+"载货:"+this.rl+"吨";
    }
}

5.主函数调试代码Main.java

package com.car;
import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        Car[] cars= {new Car1("奥迪A4",500,4),new Car2("雷诺",500,4,3),new Car3("AE86",600,1)};
        double totalprice=0;
        int totalnumber=0;
        int totalrl=0;
        String zairen = "" , zaihuo = "";

        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 yes=input.nextInt();

        if(yes==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\t\t容量");
            for(int i=0;i<cars.length;i++) {
                System.out.println((i+1)+".\t"+cars[i]);
            }

            System.out.println("请输入您要租汽车的数量");
            int num=input.nextInt();
            for(int j=0;j<num;j++) {
                System.out.println("请输入第"+(j+1)+"车的序号:");
                int c=input.nextInt();
                totalprice+=cars[c-1].price;
                totalnumber+=cars[c-1].member;
                totalrl+=cars[c-1].rl;
                if(cars[c-1].member!=0) {
                zairen+=cars[c-1].name+"  ";
                }
                if(cars[c-1].rl!=0) {
                    zaihuo+=cars[c-1].name+"  ";
                }
            }
            System.out.println("请输入租车天数");
            int days=input.nextInt();
            totalprice*=days;
            System.out.println("您的账单:");
            System.out.println("***可载人的车有");
            System.out.println(zairen+"  共载人:"+totalnumber+"人");
            System.out.println("***载货的车有");
            System.out.println(zaihuo+"  共载货:"+totalrl+"吨");
            System.out.println("***租车总价格:"+totalprice);

        }else {
            System.out.println("感谢您的访问");
        }
    }

}

6.运行效果如下图