System.out.println("序号"+"\t"+"汽车名称"+"\t"+"租金"+"\t"+"\t"+"容量");

            //打印输出可供租的汽车清单

            for (car car : carForRent) {

                //用instanceOf来测试左边类型的对象是否是右边类型的实例，返回值为Boolean

                if(car instanceof passengerCar){

                    //若它是客车类型的实例，则打印出客车应该有的属性值，这里注意强转，否则不会出现

                    //passengerCar类的CarCapacity属性

                    System.out.println(car.getCarNumber()+"\t"+car.getCarName()+"\t"+car.getCarRentMoney()

                                                  +"/天"+"\t"+"载人:"+((passengerCar)car).getCarCapacity()+"人");

                }