抽象工厂方法

工厂方法中，每个工厂类，只完成单个实体的创建。抽象工厂方法可以优化此缺点。

UML图：

示例代码：

    public interface ICar
    {
        string GuaDang();
    } 

    public class ShouDong:ICar
    {
        public string GuaDang()
        {
            return "我是手动挡";
        }
    }

    public class ZiDong:ICar
    {
        public string GuaDang()
        {
            return "我是自动挡";
        }
    }

    public interface IPlane
    {
        string Fei();
    }

    public class ShouDongPlane:IPlane
    {
        public string Fei()
        {
            return "手动飞机起飞";
        }
    }

    public class ZiDongPlane:IPlane
    {
        public string Fei()
        {
            return "自动飞机起飞";
        }
    }

    public interface IFactory
    {
        ICar GetCar();
        IPlane GetPlane();
    }

    class ShouDongFactory: IFactory
    {
        public ICar GetCar()
        {
            return new ShouDong();
        }

        public IPlane GetPlane()
        {
            return new ShouDongPlane();
        }
    }

    public class ZiDongFactory : IFactory
    {
        public ICar GetCar()
        {
            return new ZiDong();
        }

        public IPlane GetPlane()
        {
            return new ZiDongPlane();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            IFactory fac = new ShouDongFactory();
            Console.WriteLine(fac.GetCar().GuaDang());
            Console.WriteLine(fac.GetPlane().Fei());

            IFactory facA = new ZiDongFactory();
            Console.WriteLine(facA.GetCar().GuaDang());
            Console.WriteLine(facA.GetPlane().Fei());
        }
    }