package test;

class App {

    public static void makeAnimalSound(Animal animal) {
        animal.sound();
    }

    public static void main(String[] args)
    {
        Dog dog = new Dog();
        dog.sound();
        Mamal cat = new Mamal();
        dog.sound();

        makeAnimalSound(dog);
        makeAnimalSound(cat);
    }

}