public override void Handle(TrafficLight light)
{
Console.WriteLine("绿灯行");
light.SetState(LightStateFactory.GetLightState <YellowState>());
}
public override void Handle(TrafficLight light)
{
Console.WriteLine("黄灯亮了等一等");
light.SetState(LightStateFactory.GetLightState <RedState>());
}
public override void Handle(TrafficLight light)
{
Console.WriteLine("红灯停");
light.SetState(LightStateFactory.GetLightState <GreenState>());
}