static void Main(string[] args)
{
Originator originator = new Originator();
CareTaker careTaker = new CareTaker();
//设定初始状态
originator.setState("hello");
Console.WriteLine($"初始状态：{originator.getState()}");
//保存状态
careTaker.setMemento(originator.CreatMemento());
//修改状态
originator.setState("world");
Console.WriteLine($"修改后状态：{originator.getState()}");
//恢复状态
originator.restoreMemento(careTaker.GetMemento());
Console.WriteLine($"恢复后状态：{originator.getState()}");
Console.Read();
}
