总共5个类：
第1个类：Car

package DaDaRentCar;
//父类
public class Car {
     String name; //车名
     int money;  //租金
     int count;  //载人数
     int height; //载货量

}

第2个类：goodCar

package DaDaRentCar;
//只能载货的车
public class goodCar extends Car {

    public goodCar(String string, int i, int j) {
        // TODO Auto-generated constructor stub
        this.name=string;
        this.money=i;
        this.height=j;
    }

}

第3个类：peopleCar

package DaDaRentCar;
//只能载人的车
public class peopleCar extends Car {

    public peopleCar(String string, int i, int j) {
        // TODO Auto-generated constructor stub
        this.name=string;
        this.money=i;
        this.count=j;
    }   
}

第4个类：peoplegoodCar

package DaDaRentCar;
//又能载人又能载货的车
public class peoplegoodCar extends Car {

    public peoplegoodCar(String String, int i, int j, int k) {
        // TODO Auto-generated constructor stub
        this.name=String;
        this.money=i;
        this.count=j;
        this.height=k;
    }

}

第5个类：test

package DaDaRentCar;
import java.util.*;

public class test {
    public static void main(String[] args) {
        peopleCar car1 = new peopleCar("奥迪A4 ",500,4);
        peopleCar car2 = new peopleCar("马自达6 ",400,4);
        peoplegoodCar car3 = new peoplegoodCar("皮卡雪6 ",450,4,2);
        peopleCar car4 = new peopleCar("金龙 ",800,20);
        goodCar car5 = new goodCar("松花江 ",400,4);
        goodCar car6 = new goodCar("依维柯 ",1000,20);

        System.out.println("欢迎使用达达租车系统：");
        System.out.println("您是否要租车：1是 0否");
        Scanner input = new Scanner(System.in);
        int rent = input.nextInt();
        if(rent==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 容量");
            System.out.println("1.\t"+car1.name+"\t"+car1.money+"元/天  "+car1.count+"人");
            System.out.println("2.\t"+car2.name+"\t"+car2.money+"元/天  "+car2.count+"人");
            System.out.println("3.\t"+car3.name+"\t"+car3.money+"元/天  "+car3.count+"人"+"\t"+car3.height+"吨");
            System.out.println("4.\t"+car4.name+"\t"+car4.money+"元/天  "+car4.count+"人");
            System.out.println("5.\t"+car5.name+"\t"+car5.money+"元/天  "+car5.height+"吨");
            System.out.println("6.\t"+car6.name+"\t"+car6.money+"元/天 "+car6.height+"吨");

        System.out.println("请输入要租车的数量：");
        int quality = input.nextInt();//租车数量
        int money=0;
        int height=0;
        int count=0;
        String name1="";//存储客车名
        String name2="";//存储货车名
        for(int i=1;i<=quality;i++){
            System.out.println("请输入第"+i+"辆车的序号");
            int score = input.nextInt();//租车序号
            switch(score){
            case 1:
                name1+=car1.name;
                money += car1.money;
                count += car1.count;
                break;
            case 2:
                name1+=car2.name;
                money+=car2.money;
                count+=car2.count;
                break;
            case 3:
                name1+=car3.name;
                name2+=car3.name;
                money+=car3.money;
                count+=car3.count;
                height+=car3.height;
                break;
            case 4:
                name1+=car4.name;
                money+=car4.money;
                count+=car4.count;
                break;
            case 5:
                name2+=car5.name;
                money+=car5.money;
                height+=car5.height;
                break;
            case 6:
                name2+=car6.name;
                money+=car6.money;
                height+=car6.height;
                break;
            }

        }
        System.out.println("请输入租车天数");
        int day = input.nextInt();//租车天数
        System.out.println("您的账单：");
        System.out.println("***您租载人的车有：");
        System.out.println(name1+"总载人数："+count+"人");
        System.out.println("***您租载货的车有：");
        System.out.println(name2+"总载货量："+height+"吨");
        System.out.println("***您租了："+day+"天");
        System.out.println("***租车总价格："+day*money+"元");
    } else if(rent==0){
        System.out.println("系统已停止工作，欢迎您再来！");
    }else{
        System.out.println("您输入有误！请重新运行");
    }
    }

}