public class MainFiveAdvanced {
    public abstract static class Vehicle {
        public abstract void run();
    }

    public static class Car extends Vehicle {
        public void run() {
            System.out.println("This is car running!");
        }
    }

    public static class Bike extends Vehicle {
        public void run() {
            System.out.println("This is bike running!");
        }
    }

    public static class Truck extends Vehicle {
        public void run() {
            System.out.println("This is truck running!");
        }
    }

    public static void main(String[] args) {
        Vehicle[] vehicles = new Vehicle[5];

        vehicles[0] = new Car();
        vehicles[1] = new Bike();
        vehicles[2] = new Truck();
        vehicles[3] = new Car();
        vehicles[4] = new Truck();

        for (Vehicle vehicle : vehicles) {
            vehicle.run();
        }
    }
}