class Animal
{
    public void callme()
    {
        System.out.println("In callme of Animal");
    }
}


class Dog extends Animal
{
    public void callme()
    {
        System.out.println("In callme of Dog");
    }

    public void callme2()
    {
        System.out.println("In callme2 of Dog");
    }
}

public class UseAnimlas
{
    public static void main (String [] args)
    {
        Dog d = new Dog();
        Animal a = (Animal)d;
        d.callme();
        a.callme();
        ((Dog) a).`callme2`();
    }
}

Animal animal = new Dog();
Dog castedDog = (Dog) animal;

Animal animal = new Animal();
Dog dog = (Dog) animal;

Animal a = (Animal)d;

Animal a = d;

class Dog extends Animal
{
    public void callme()
    {
        super.callme();
        System.out.println("In callme of Dog");
    }
    ...
}

{

    System.out.println("In callme of Animal");

}

public void callme()

{

    System.out.println("In callme of Dog");

}

public void callme2()

{

    System.out.println("In callme2 of Dog");

}

public static void main (String [] args)

{

    Animal animal = new Animal ();

    Dog dog = new Dog();

    Animal ref;

    ref = animal ;

    ref.callme();

    ref= dog;

    ref.callme();

    //dog.callme2();

}