面向对象（2）--深入继承

public abstract class Animal

    {

        public abstract void ShowType();

        public void Eat()

        {

            Console.WriteLine("Animal always eat.");

        }

    }

    public class Bird: Animal

    {

        private string type = "Bird";

        public override void ShowType()

        {

            Console.WriteLine("Type is {0}", type);

        }

        private string color;

        public string Color

        {

            get { return color; }

            set { color = value; }

        }

    }

    public class Chicken : Bird

    {

        private string type = "Chicken";

        public override void ShowType()

        {

            Console.WriteLine("Type is {0}", type);

        }

        public void ShowColor()

        {

            Console.WriteLine("Color is {0}", Color);

        }

    }