using System;
public abstract class Clock {
public abstract void Play();
}
public class RedClock: Clock {
public override void Play() {
Console.WriteLine("RedClock.Play()");
}
}
public class BlueClock: Clock{
public override void Play()
{
Console.WriteLine("BlueClock.Play()");
}
}
class MainClass
{
public static void CallPlay(Clock ms)
{
ms.Play();
}
public static void Main()
{
Clock ms = new RedClock();
CallPlay(ms);
ms = new BlueClock();
CallPlay(ms);
}
}
RedClock.Play()
BlueClock.Play()