public class Initial {

public static void main(String[] args) {

// TODO Auto-generated method stub

/*Transportation tr1=new Bike();

tr1.take();

Transportation tr2=new Motor();

tr2.take();

Transportation tr3=new Bus();

tr3.take();

Transportation tr4=new Ship();

tr4.take();

Transportation tr5=new Plane();

tr5.take();*/

//tr2.hehe(); 不能通过父类的引用调用子类独有的方法

}

Bike bi=new Bike();

Transportation tr=bi;

Bike bi1=(Bike)tr;

Motor mo=(Motor)tr;

}