Error when extending superclass to subclass in Java - polymorphism

Question

I'm currently tackling polymorphism on my java journey and I'm trying out these example codes in Eclipse. I just copied the codes but I'm really wondering why my codes wouldn't compile.

So I got three files: Example.java, Animals.java and Dog.java.

Example.java contains the main method:

public class Example {
    public static void main(String[] args) {
        Animal myDog = new Dog();
    }
}

Then I created two other classes for Animal and Dog as follows

Animal Class

public class Animal {

    public void makeNoise() {
    }

    public void eat(){
    }

    public void sleep() {   
    }

    public void roam() {

    }

}

Dog Class

public class Dog {

}

The way I understand it is that I can make Dog my subclass that extends the superclass Animal. But why wouldn't my codes compile?

Am I missing something in these codes?

Answer 1

Your Dog class doesnt extend animal class so this is invalid:

Animal myDog = new Dog();

you need to modify the class Dog in order to inherit the Animal Class

you achieve that doing:

public class Dog extends Animal{