绿灯亮30秒
2023-06-07 本文已影响0人
哈迪斯Java
class TrafficLights {
}
class RedLight extends TrafficLights {
}
class YellowLight extends TrafficLights {
}
class GreenLight extends TrafficLights {
}
public class Lights {
public static void main(String[] args) {
TrafficLights red = new RedLight();
lighten(red);
TrafficLights yellow = new YellowLight();
lighten(yellow);
TrafficLights green = new GreenLight();
lighten(green);
}
public static void lighten(TrafficLights light) {
if(light instanceof RedLight)
System.out.println("红灯亮45秒");
if(light instanceof YellowLight)
System.out.println("黄灯亮5秒");
if(light instanceof GreenLight)
System.out.println("绿灯亮30秒");
}
}
