interface USB {//规定usb的规范
    void plugln();
    void work(); 
}

class Mouse implements USB {//implement意思是遵守规范
    @Override
    public void plugln(){
        System.out.println("鼠标已接入USB口");
    }

    @Override
    public void work(){
        System.out.println("鼠标：移动光标，点击左右键");
    }
}

class Keyboard implements USB{
    @Override
    public void plugln(){
        System.out.println("键盘已插入USB口");
    }

    @Override
    public void work(){
        System.out.println("键盘：可以打字输入");
    }
}

class Conputer{
    public void useUSB(USB usb){
        System.out.println("电脑检测到新设备");
        usb.plugln();
        usb.work();
        System.out.println();
    }
}

public class USBTest {
    public static void main(String[] args) {
        Computer computer = new Conputer();

        USB mouse=new Mouse();
        USB keyborad=new Keyboard();
        
        computer.useUSB(mouse);
        computer.useUSB(keyboard);
    }
}