本java代码作为模拟ATM取款机的基本操作，其中增加了基本的注册和登录功能来实现无卡情况下的存取款操作。运行其中的helloatm测试类即可实现操作。基本特点：

1.卡号为系统指定，无需自己设置，自己需要输入用户名和密码。

2.若是密码输错三次系统将自动退出。

3.支持存取款和查询功能。

适合初学者观看，本代码不能抵抗非法输入，感兴趣的小伙伴可以自己完善代码，以抵抗非法输入。

谢谢。支持原创。-The Java code as a basic operation simulation of ATM, which strengthen the function of basic registration and login to implement without card different operations. Run the helloatm test class operation can be realized. Basic features:

1. The card number for the system specified, without their Settings, you need to input the user name and password.

2. If the wrong password to lose three times the system will automatically quit.

3. Support different and query function.

Suitable for beginners, the code can not resist the illegal input, interested friends can improve our code, against illegal input.

thank you Support the original.