java面向对象接口的使用

interface USB {
    void start();

    void stop();
}

class USBDisk implements USB {

    @Override
    public void start() {
        System.out.println("U盘插入");
    }

    @Override
    public void stop() {
        System.out.println("U盘拔出");
    }
}

class Print implements USB {

    @Override
    public void start() {
        System.out.println("打开打印机");
    }

    @Override
    public void stop() {
        System.out.println("关闭打印机");
    }
}
class PC{
    public static void work(USB usb){
       usb.start();
        System.out.println("检测到有设备接入");
        usb.stop();
    }
}

public class InterfaceDemo {
    public static void main(String args[]){
        PC pc  = new PC();
        pc.work(new USBDisk());
        pc.work(new Print());
    }

}