static void Main(string[] args)
{
AlertStateContext stateContext = new AlertStateContext();
stateContext.Alert();
stateContext.setState(new Vibration());
stateContext.Alert();
stateContext.Alert();
stateContext.setState(new Silent());
stateContext.Alert();
stateContext.Alert();
}
public void Alert(AlertStateContext ctx)
{
Console.WriteLine("Vibrating...");
}
public void Alert(AlertStateContext ctx)
{
Console.WriteLine("Silent...");
}