why System.out.println("Grr..."); //"Grr..." is not printed ? // but the class dog is extends animal can anyone explain m

Question

class Animal {
public void makeSound() {
System.out.println("Grr...");
}
}
class Cat extends Animal {
public void makeSound() {
System.out.println("Meow");
}
}
class Dog extends Animal {
public void makeSound() {
System.out.println("Woof");
}
}
class Program {
public static void main(String args[ ]) {
Animal a = new Dog();
Animal b = new Cat();
a.makeSound();
b.makeSound();
}
}
why System.out.println("Grr..."); //"Grr..."
is not printed ? // but the class dog is extends animal
can anyone explain me and what if i want to print the line ?

Answer 1

Because the Animal's makeSound is overridden by the Dog's makeSound

Answer 2

thanks @~ swim ~ and @Baptiste E for guiding and helping me

Answer 3

Is Polymorphism and Overriding are same or different ?