红绿灯练习题

interface Colorful {
void shine();
}

class RedLights implements Colorful {
@Override
public void shine() {
System.out.println("红灯亮红光");
}
}

class YellowLights implements Colorful {
@Override
public void shine() {
System.out.println("黄灯亮黄光");
}
}

class GreenLights implements Colorful {
@Override
public void shine() {
System.out.println("绿灯亮绿光");
}
}