抽象工厂模式(Abstract Factory)

提供一个创建一系列相关或相互依赖的对象的接口,而不需指定它们具体的类。

通常在run-time式创建一个ConcreateFactory类的单体实例。这个ConcreteFactory创建ConcreteProduct对象。为了创建不同的ConcreteProduct对象,clients需要使用不同的ConcreteFactory

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AbstractFactoryContinentFactory

定义一个接口,用来创建抽象products

ConcreteFactoryAfrciaFactory,AmericaFactory

实现创建具体的Products

AbstractProductHerbivoreCarnivore

声明一个接口表示一种product类型

ProductWildebeestLionBisonWolf

定义被相关Concrete factory创建的product对象

实现AbstractProduct接口

ClientAnimalWorld

使用AbstractFactoryAbstractProduct

代码:

//AbstractFactory

public interface ContinentFactory{

public Herbivore CreateHerbivore();

public Carnivore CreateCarnivore();

}

//ConcreteFactory

public class AfricaFactory implements ContinentFactory{

public Herbivore CreateHerbivore(){

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{

}

public interface Carnivore{

public void Eat(Herbivore h);

}

//Product

public class Wildebeest implements Herbivore{

}

public class Lion implements Carnivore{

public void Eat(Herbivore h){

System.out.println(“Lion eats “ +h.getName());

}

}

public class Bison implements Herbivore{

}

public class Wolf implements Carnivore{

public void Eat(Herbivore h){

System.out.println(“Wolf eats “ +h.getName());

}

}

//Client

public class AnimalWorld{

private Herbivore herbivore;

private Carnivore carnivore;

public AnimalWorld(ContinentFactory factory){

carnivore=factory. CreateCarnivore();

herbivore=factory. CreateHerbivore();

}

//Mehtods

public void RunFoodChain(){

carnivore.Eat(herbivore);

}

public static void main(String[] args){

AnimalWorld world=new AnimalWorld(new AfricaFactory());

world.RunFoodChain();

world=new AnimalWorld(new AmericaFactory());

world.RunFoodChain();

}

Output

Lion eats Wildebeest
Wolf eats Bison

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