说明：  门禁系统的面向对象设计 包含如下功能:公司的雇员可以凭借密码、胸卡或指纹进入公司,计算机根据雇员的验证方式对其身份进行验证,管理员在监控室可以通过按钮直接开启电子门,访客可以按门铃请求进入，由管理员为其放行,管理员可以为新职员设置密码
(Access control system object-oriented design includes the following features: the company' s employees can rely on password, badge or fingerprint into the company, computer authentication of the employee to verify their identity, the administrator in the control room directly through the button to open the electronic door, visit passengers can ring the bell to enter the request by the administrator of its release, administrators can set a password for the new staff)