Subsystem Classes (Amplifier, DVDPlayer): ○ These classes represent the components of the complex subsystem. They have specific functionalities but are complicated to interact with individually.

mplifier:

public class Amplifier
{
public void On() => Console.WriteLine("Amplifier is on.");
public void Off() => Console.WriteLine("Amplifier is off.");
}

DVDPlayer:

public class DVDPlayer
{
public void Play(string movie) => Console.WriteLine($"Playing

{movie}.");

}