public static void main(String args[]) {
        Cat[] catArray = {new Cat(), new Cat()};
        Dog[] dogsArray = {new Dog(), new Dog()};
        Animal[] animalsArray;

        animalsArray = catArray;
        for (Animal animal : animalsArray) {
            animal.speak();
        }

        animalsArray = dogsArray;
        for (Animal animal : animalsArray) {
            animal.speak();
        }
    }