static void Main(string[] args)
{
IList <Memento> undos = new List <Memento>();
Notepad notepad = new Notepad();
Memento undo;
// frist revision
undo = notepad.SetText("cool");
undos.Add(undo);
Console.WriteLine("curretly in the notepade ");
Console.WriteLine(notepad.GetText());
// sec revision
undo = notepad.SetText("hello, i ma m, if youare reidng cool ");
undos.Add(undo);
Console.WriteLine("currenlty in the notepad ++ ");
Console.WriteLine(notepad.GetText());
Console.WriteLine("issue undo cmd ");
notepad.Undo(undos[1]);
Console.WriteLine("curretly in the notepade (after undo ");
Console.WriteLine(notepad.GetText());
Console.WriteLine("issue undo cmd ");
notepad.Undo(undos[0]);
Console.WriteLine("curretly in the notepade (after undo ");
Console.WriteLine(notepad.GetText());
Console.ReadKey();
}
//Caretaker
static void Main(string[] args)
{
IList <Memento> undos = new List <Memento>();
Notepad notepad = new Notepad();
Memento undo;
//First Revision
undo = notepad.SetText("cool");
undos.Add(undo);
Console.WriteLine("Currently in the notepad:");
Console.WriteLine(notepad.GetText());
//Second Revision
undo = notepad.SetText("Something cool, but not cool enough to impress you!");
undos.Add(undo);
Console.WriteLine("\nCurrently in the notepad:");
Console.WriteLine(notepad.GetText());
Console.WriteLine("\nIssue Undo command");
notepad.Undo(undos[1]);
Console.WriteLine("\nCurrently in the notepad <after undo>:");
Console.WriteLine(notepad.GetText());
Console.Read();
}