Instantiating interfaces in Java

Question

I have this interface:

public interface Animal {
    public void Eat(String name);
}

And this code here implements the interface:

Answer 1

Dog is not an interface: Dog is a class that implements the Animal interface.

There's nothing untoward going on here.

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Note that you can instantiate an anonymous implementation of an interface, like so:

Animal animal = new Animal() {
    public void Eat(String food_name) {
        System.out.printf("Someone ate " + food_name);
    }
};