为甚么结果输出的载客量与载货量为0

package HomeWork;

import java.io.InputStream;

import java.util.Scanner;

//是否借车》可借车辆展示》选择想借几款类型》选择租借车辆款式》打印账单

public class Rentsys {

public void showcars() {

Car[] cars = new Car[3]; 

cars[0] =new SUV(1,"SUV轿车",300,6);

cars[1]=new GoodCar(2,"大货车",300,8);

cars[2]=new Pickup(3,"皮卡",200,6,4.0);

System.out.println("有以下可租车辆：");

for (int i = 0; i < cars.length; i++) {

if (i==0) {

System.out.println("车辆编号:"+(i+1)+"车型："+cars[i].getBrand()+"费用(元/天):"+cars[i].getFee()+"载客量："+

cars[i].getPersoncapacity());

} else if (i==1) {

System.out.println("车辆编号:"+(i+1)+"车型："+cars[i].getBrand()+"费用(元/天):"+cars[i].getFee()+"载客量："+

cars[i].getThingcapacity());

} else {

System.out.println("车辆编号:"+(i+1)+"车型："+cars[i].getBrand()+"费用(元/天):"+cars[i].getFee()+"载客量："+

cars[i].getPersoncapacity()+"载货量:"+cars[i].getThingcapacity());

}

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

System.out.println("欢迎使用达达，请问是否租车？");

System.out.println("1.是   2.否");

Scanner sc = new Scanner(System.in);

int in = sc.nextInt();

if (in==1) {

Rentsys rent = new Rentsys();

rent.showcars();

} else {

System.out.println("欢迎下次光临！");

}

}

}

欢迎使用达达，请问是否租车？

1.是   2.否

1

有以下可租车辆：

车辆编号:1车型：SUV轿车费用(元/天):300载客量：0

车辆编号:2车型：大货车费用(元/天):300载客量：0.0

车辆编号:3车型：皮卡费用(元/天):200载客量：0载货量:0.0