在Java中实现Factory Pattern的最佳方法

public interface AnimalFactory {
    Animal createDog();
    Animal createCat();
}

public class DefaultAnimalFactory implements AnimalFactory {
    @Override
    public Animal createDog() {
        return new Dog();
    }

    @Override
    public Animal createCat() {
        return new Cat();
    }
}

public abstract class Animal {
    public abstract void makeSound();
}

public class Dog extends Animal {
    @Override
    public void makeSound() {
        System.out.println("汪汪汪");
    }
}

public class Cat extends Animal {
    @Override
    public void makeSound() {
        System.out.println("喵喵喵");
    }
}

public class Client {
    public static void main(String[] args) {
        AnimalFactory factory = new DefaultAnimalFactory();
        Animal dog = factory.createDog();
        dog.makeSound();

        Animal cat = factory.createCat();
        cat.makeSound();
    }
}