代码参考了@nuanchazy的手记

创建了Vehicle父类，Car、Cargo、Pickup子类,没有使用接口。
Test.java

```package com.DaDa;

import java.util.Scanner;

public class Test {
    int sumPeople;//总载客量
    int sumCargo;//总载货量
    int sumPrice;//总价格
    String cargoName="";//可载货的汽车名称
    String carName="";//可载人的汽车名称
    //询问是否使用系统
    public void start() {
        System.out.println("欢迎使用答答租车系统：n您是否要租车：1.是      0.否");
        Scanner sc1=new Scanner(System.in);
        int sc1a=sc1.nextInt();
        while (sc1a!=1&&sc1a!=0) {//当输入值不是1或0时要求重新输入
            System.out.println("您输入的信息有误，请重新输入:");
            Scanner sc2=new Scanner(System.in);
            sc1a=sc2.nextInt();
        }
        if (sc1a==0) {
            System.out.println("******感谢使用答答租车系统******");
            return;
        }
        //输出价目表
        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");
        Vehicle[] vehicles= {new Car(1, "奥迪A4", 500, 4),
                             new Car(2, "马自达6", 400, 4),
                             new Pickup(3, "皮卡", 450, 4, 2),
                             new Car(4, "金龙", 800, 20),
                             new Cargo(5, "松花江", 400, 4),
                             new Cargo(6, "依维柯", 1000, 20)};
        for (int i = 0; i =7) {//确保输入值为1~6
                System.out.println("您输入的序号有误，请重新输入:");
                Scanner sc6=new Scanner(System.in);
                sc5a=sc6.nextInt();
            }
            sumPeople+=vehicles[sc5a-1].people;//将所选汽车的载客量相加得出总载客量
            sumCargo+=vehicles[sc5a-1].cargo;//将所选汽车的载货量相加得出总载货量
            sumPrice+=vehicles[sc5a-1].price;//将所选汽车的价格相加得出总价格
            if (vehicles[sc5a-1].getClass()==Car.class){//判断所选汽车可是否可载人
                carName+=vehicles[sc5a-1].name+"   ";
            } else if (vehicles[sc5a-1].getClass()==Cargo.class) {//判断所选汽车可是否可载货
                cargoName+=vehicles[sc5a-1].name+"   ";
            }else if (vehicles[sc5a-1].getClass()==Pickup.class) {
                carName+=vehicles[sc5a-1].name+"   ";
                cargoName+=vehicles[sc5a-1].name+"   ";
            }
        }
        //输入租车天数
        System.out.println("请输入您要租车的天数：");
        Scanner sc7=new Scanner(System.in);
        int sc7a=sc7.nextInt();
        while (sc7a0) {//无可载人汽车则不输出
            System.out.println("***可载人的车有:n"+carName+"     共载："+sumPeople+"人");
        }
        if (sumCargo>0) {//无可载货汽车则不输出
            System.out.println("***可载货的车有:n"+cargoName+"     共载："+sumCargo+"吨");
        }
        System.out.println("***租车总价格:"+sumPrice+"元");
    }
    //主方法
    public static void main(String[] args) {
        Test aTest=new Test();
        aTest.start();
    }

}

Vehicle.java

package com.DaDa;
//创建车辆父类，用于被3种车型的子类基础，子类可使用父类的成员变量
public abstract class Vehicle {
    int id;
    String name;
    int price;
    int people;
    int cargo;
}

Car.java

package com.DaDa;
//只载人汽车
public class Car extends Vehicle {
    public Car() {
    }
    public Car(int id,String name,int price,int people) {
        this.id=id;
        this.name=name;
        this.price=price;
        this.people=people;
    }
    @Override
    public String toString() {
        return id+".t"+name+"t"+price+"元/天t"+"载人："+people+"人";
    }
}

Cargo.java

package com.DaDa;
//只载货的货车
public class Cargo extends Vehicle {

    public Cargo(int id,String name,int price,int cargo) {
        this.id=id;
        this.name=name;
        this.price=price;
        this.cargo=cargo;
    }
    @Override
    public String toString() {
        return id+".t"+name+"t"+price+"元/天t"+"载货："+cargo+"吨";
    }
}

Pickup.java

package com.DaDa;
//即可载人又可载货的皮卡
public class Pickup extends Vehicle {

    public Pickup(int id,String name,int price,int people,int cargo) {
        this.id=id;
        this.name=name;
        this.price=price;
        this.people=people;
        this.cargo=cargo;
    }
    @Override
    public String toString() {
        return id+".t"+name+"t"+price+"元/天t"+"载人："+people+"人,载货："+cargo+"吨";
    }
}