模拟银行管理系统登录页面后台代码，GUI用户登录界面，在数据库中查找用户名和密码-Simulation of bank management system login page code behind, GUI user login screen, look in the database user name and password

模拟实现基本的atm功能，包括存取款、后台管理、用户管理等-Atm to achieve the basic simulation functionality, including deposit, backstage management, user management, etc.