A parent reference to a child object

Predict the outputEasyJava onlyAsked in: Cognizant, Wissen Technology

Main.java

class Animal {
    String sound() {
        return "...";
    }
}

class Dog extends Animal {
    @Override
    String sound() {
        return "Woof";
    }
}

public class Main {
    public static void main(String[] args) {
        Animal a = new Dog();
        Animal b = new Animal();
        System.out.println(a.sound());
        System.out.println(b.sound());
    }
}

What does it print?

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