能够实现指定对象的创建，当创建客车对象时，需要用户输入在客人数，当创建货车对象时，需要用户输入载重量以及车辆等级，能够完成相应 车辆对象的相应参数信息输出-Able to achieve the creation of the specified object, when you create a bus object, requires the user to input the number of guests, when a lorry object is created, requires the user to enter weight, and vehicle level, be able to complete the corresponding vehicle object corresponding parameter information output