abstract class Vehicle{
	public abstract void run();
}
class Car extends Vehicle{
	public void run(){
		System.out.println("小轿车驶过");
	}
}
class Bike extends Vehicle{
	public void run(){
		System.out.println("自行车驶过");
	}
}
class Trunk extends Vehicle{
	public void run(){
		System.out.println("卡车驶过");
	}
}
public class MainVehicle{
	public static void main(String[] args){
		Vehicle[] vehicles = {
			new Car(),
			new Bike(),
			new Trunk()
		};
		for(Vehicle v : vehicles){
			v.run();
		}
	}
}