Runtime Polymorphism

package q56422;
import java.util.Scanner;
class Animal {
    public void makeSound() {
        System.out.println("Animal makes a sound");
    }
}
class Dog extends Animal {
    @Override
    public void makeSound() {
        System.out.println("Dog barks");
    }
}
class Cat extends Animal {
    @Override
    public void makeSound() {
        System.out.println("Cat meows");
    }
}
public class RuntimePolymorphism {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String animalType = scanner.nextLine();
        Animal animal = null;
        if (animalType.equalsIgnoreCase("Dog")) {
            animal = new Dog();
        } else if (animalType.equalsIgnoreCase("Cat")) {
            animal = new Cat();
        } else {
            System.out.println("invalid animal");
        }
        animal.makeSound();
        scanner.close();
    }
}