Override使用对象

    public class VirtualTest
    {
        public virtual void show() //定义虚方法关键词virtual
        {
            Console.WriteLine();
        }
    }
    public class VirtualTestChild : VirtualTest
    {
        public override void show()
        {
            Console.WriteLine();
        }
    }

    public abstract class Name //有抽象方法必是抽象类
    {
        public abstract void Play() //抽象方法关键词abstract
        {
            Console.WriteLine();
        }
    }
    public class NewName : Name
    {
        public override void Play()
        {
            Console.WriteLine();
        }
    }

    public abstract class Name //有抽象方法必是抽象类
    {
        public abstract void Play() //抽象方法关键词abstract
        {
            Console.WriteLine();
        }
    }
    public class NewName : Name
    {
        public override void Play()
        {
            Console.WriteLine();
        }
    }
    public class TwoName : NewName
    {
        public override void Play()
        {
            Console.WriteLine();
        }
    }