public class Test {
public static void main(String[] args) {
Vehicle o2 = new Bus();
Vehicle o3 = new Ferry();
Vehicle o4 = new Plane();
o2.method("Bus", "land");
o2.passenger(40);
o3.method("Ferry", "sea");
o3.passenger(200);
o4.method("Plane", "air");
o4.passenger(300);
}
}
