Why bark method can not be called

Question

class Animal{
    void run() {
    }
}
class Dog extends Animal {
    void bark() {
    }
}
class Testing{
    public static void main(String[] args)  {
        Animal d         


        

Answer 1

You have declared d as an Animal.

However, while internally d may be a Dog, being stored as an Animal will only allow you to use methods declared in Animal.