Abstract Factory
Java 9 does provide some improvements to the abstract factory patterns, Here is an example of how to implement the abstract factory pattern in Java 9:
1. First, define an interface for the abstract factory:
```
public interface AnimalFactory {
Shape createAnimal();
}
```
2. Implement the interface with concrete factory classes for each type of shape:
```
public class BirdFactory implements AnimalFactory {
@Override
public Animal createAnimal() {
return new Bird();
}
}
public class DogFactory implements AnimalFactory {
@Override
public Animal createAnimal() {
return new Dog();
}
}
```
3. Create a client class that uses the abstract factory and does not depend on the actual animal classes:
```
public class AnimalClient {
private AnimalFactory factory;
public AnimalClient(AnimalFactory factory) {
this.factory = factory;
}
public Animal getAnimal() {
return factory.createAnimal();
}
}
```
4. Finally, use the client class to create the animals:
```
public class Main {
public static void main(String[] args) {
AnimalClient animalClient = new AnimalClient(new BirdFactory());
Animal bird = animalClient.getBird();
Bird.fly();
animalClient = new AnimalClient(new DogFactory());
Dog dog=animalClient.getAnimal();
dog.think();
}
}
```
This implementation demonstrates how the abstract factory pattern allows you to create sets of related objects without exposing their implementation details to the client code. By passing different concrete factories to the client, you can create different sets of animal objects.
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