抽象工厂模式（Abstract Factory）[4]

                        return new Wildebeest();

            }

            public Carnivore CreateCarnivore(){

                        return new Lion();

            }

}

public class AmericaFactory implements ContinentFactory{

            public Herbivore CreateHerbivore(){

                        return new Bison();

            }

            public Carnivore CreateCarnivore(){

                        return new Wolf();

            }

}

//AbstractProduct

public interface Herbivore{

}