static void Main(string[] args)
{
Computer comp = new Computer();
comp.Start("macOS Big Sur");
Console.WriteLine(comp.OS.Name);
//we can't change OS, because the object has been already created
comp.OS = OS.GetInstance("Windows 10");
Console.WriteLine(comp.OS.Name);
//Before: macOS Big Sur, Windows 10
(new Thread(() =>
{
Computer comp2 = new Computer();
comp2.OS = OsLock.GetInstance("Windows 10");
Console.WriteLine(comp2.OS.Name);
})).Start();
Computer comp = new Computer();
comp.Start("macOS Big Sur");
Console.WriteLine(comp.OS.Name);
//After: macOS Big Sur, macOS Big Sur
}
} //there could be just one operating system on a computer
public void Start(string osName) //launch the operating system
{
OS = OsLock.GetInstance(osName);
}