The AbstractDuckFactory is an example of the Abstract Factory Pattern. In the Abstract Factory Pattern, you define an interface for creating families of related or dependent objects without specifying their concrete classes. The idea is to provide an interface for creating families of objects, and the concrete implementations of this interface produce objects that are designed to work together.

In the provided code:

public interface AbstractDuckFactory {
    Quackable createMallardDuck();
    Quackable createRedheadDuck();
    Quackable createDuckCall();
    Quackable createRubberDuck();
}

AbstractDuckFactory is the abstract factory interface, and its concrete implementations (DuckFactory and CountingDuckFactory) create families of related duck objects (MallardDuck, RedheadDuck, DuckCall, RubberDuck). Each concrete factory produces a family of ducks, and the Quackable interface ensures that the created ducks have a common interface for quacking.

So, the usage of AbstractDuckFactory aligns with the principles of the Abstract Factory Pattern.