7-4 USB接口的定义 (10分）

public class Demo04 {
    public static void main(String[] args) {
        USB usb1 = new Mouse();
        usb1.work();
        usb1.stop();
        USB[] usbs = new USB[2];
        usbs[0] = new UPan();
        usbs[1] = new Mouse();
        for (int i=0;i
            usbs[i].work();
            usbs[i].stop();
        }
    }
}
interface USB{
    void work();
    void stop();
}
class Mouse implements USB{
    @Override
    public void work(){
        System.out.println("我点点点");
    }
    @Override
    public void stop(){
        System.out.println("我不能点了");
    }
}
class UPan implements USB{
    @Override
    public void work(){
        System.out.println("我存存存");
    }
    @Override
    public void stop(){
        System.out.println("我走了");
    }
}