/// <summary>
        /// 复合享元
        /// </summary>
        static void Flyweight()
        {
            Console.WriteLine($"复合享元{Environment.NewLine}-------------------------------------------");

            IShape circleA    = FlyweightFactory.Instance.CreateCircle("很圆的圆形B");
            IShape circleB    = FlyweightFactory.Instance.CreateCircle("很圆的圆形B");
            IShape rectangleA = FlyweightFactory.Instance.CreateRectangle("很方的长方形B");

            Console.WriteLine("--------------");

            IShape shapCompositeA = FlyweightFactory.Instance.CreateComposite();

            shapCompositeA.Add(circleA);
            shapCompositeA.Add(rectangleA);
            shapCompositeA.Draw(ConsoleColor.Yellow, 10, 130);
            Console.WriteLine("--------------");

            IShape shapCompositeB = FlyweightFactory.Instance.CreateComposite();

            shapCompositeB.Add(circleA);
            shapCompositeB.Add(circleB);
            shapCompositeB.Add(rectangleA);
            shapCompositeB.Draw(ConsoleColor.Blue, 25, 60);
            Console.WriteLine("--------------");

            Console.WriteLine($"享元池长度:{FlyweightFactory.Instance.PoolSize}");
            Console.WriteLine($"shapCompositeA与shapCompositeB是否指向同一内存地址:{object.ReferenceEquals(shapCompositeA, shapCompositeB)}");
            Console.ReadKey();
        }