多态

    class Program
    {
        static void Main(string[] args)
        {
            //概念:让一个对象能够表现出多种的状态(类型)
            //实现多态的3种手段：1、虚方法 2、抽象类 3、接口

            Chinese cn1 = new Chinese("韩梅梅");
            Chinese cn2 = new Chinese("李雷");
            Japanese j1 = new Japanese("树下君");
            Japanese j2 = new Japanese("井边子");
            Korea k1 = new Korea("金秀贤");
            Korea k2 = new Korea("金贤秀");
            American a1 = new American("科比布莱恩特");
            American a2 = new American("奥尼尔");
            Person[] pers = { cn1, cn2, j1, j2, k1, k2, a1, a2, new English("格林"), new English("玛利亚") };

            for (int i = 0; i < pers.Length; i++)
            {
                //if (pers[i] is Chinese)
                //{
                //    ((Chinese)pers[i]).SayHello();
                //}
                //else if (pers[i] is Japanese)
                //{
                //    ((Japanese)pers[i]).SayHello();
                //}
                //else if (pers[i] is Korea)
                //{
                //    ((Korea)pers[i]).SayHello();
                //}
                //else
                //{
                //    ((American)pers[i]).SayHello();
                //}


                pers[i].SayHello();
            }
            Console.ReadKey();
        }
    }

    public class Person
    {
        private string _name;
        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }

        public Person(string name)
        {
            this.Name = name;
        }
        public virtual void SayHello()
        {
            Console.WriteLine("我是人类");
        }
    }

    public class Chinese : Person
    {
        public Chinese(string name)
            : base(name)
        {

        }

        public override void SayHello()
        {
            Console.WriteLine("我是中国人，我叫{0}", this.Name);
        }
    }

    public class Japanese : Person
    {
        public Japanese(string name)
            : base(name)
        { }

        public override void SayHello()
        {
            Console.WriteLine("我是脚盆国人，我叫{0}", this.Name);
        }
    }

    public class Korea : Person
    {
        public Korea(string name)
            : base(name)
        {

        }

        public override void SayHello()
        {
            Console.WriteLine("我是棒之思密达，我叫{0}", this.Name);
        }
    }

    public class American : Person
    {
        public American(string name)
            : base(name)
        {

        }

        public override void SayHello()
        {
            Console.WriteLine("我叫{0}，我是米国人", this.Name);
        }
    }

    public class English : Person
    {
        public English(string name)
            : base(name)
        { }

        public override void SayHello()
        {
            Console.WriteLine("我是英国人");
        }
    }