【设计模式】之 Abstract Factory 抽象工厂-优快云博客

本文通过C#代码实现了一个抽象工厂模式的例子，展示了如何根据不同大陆创建对应的草食动物和食肉动物，进而模拟食物链的过程。

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DesignFactory.AbstractFactory
{

    /// <summary>
    /// Herbivore： 草食动物
    /// Carnivore： 食肉动物
    /// Bison ： 美洲或者欧洲的野牛
    /// </summary>
    abstract  class ContinentFactory
    {
        abstract public Herbivore CreateHerbivore();
        abstract public Carnivore CreateCarnivore();
    }

    class AfricaFactory : ContinentFactory
    {
        public override Herbivore CreateHerbivore()
        {
            return new Wildebeest();
        }

        public override Carnivore CreateCarnivore()
        {
            return new Lion();
        }
    }


    class AmericalFactory : ContinentFactory
    {
        public override Herbivore CreateHerbivore()
        {
            return new Bison();
        }

        public override Carnivore CreateCarnivore()
        {
            return new Wolf();
        }
    }

    abstract class Herbivore
    { }

    abstract class Carnivore
    {
        abstract public void Eat(Herbivore h);
    }

    class Wildebeest : Herbivore
    { }

    class Lion : Carnivore
    {
        public override void Eat(Herbivore h)
        {
            Console.WriteLine(this + "eats" + h);
        }
    }

    class Bison : Herbivore
    {
      
    }

    class Wolf : Carnivore
    {
        public override void Eat(Herbivore h)
        {
            Console.WriteLine(this + "eats" + h);
        }
    }

    class AnimalWorld
    {
        private Herbivore herbivore;
        private Carnivore carnivore;
        public AnimalWorld(ContinentFactory factory)
        {
            carnivore = factory.CreateCarnivore();
            herbivore = factory.CreateHerbivore();
        }

        public void RunFoodChain()
        {
            carnivore.Eat(herbivore);
        }
    }

    class GameApp
    {
        public static void Main(string[] args)
        {
            ContinentFactory africa = new AfricaFactory();
            AnimalWorld world = new AnimalWorld(africa);
            world.RunFoodChain();

            ContinentFactory america = new AmericalFactory();
            world = new AnimalWorld(america);
            world.RunFoodChain();

        }
    }

}