Guaranteed condition: If any invalid card is read, the circuit in the lock can still function properly with no damage.

保证条件：接触任何非法卡，锁内电路不会损坏，仍能正常使用。

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The command bean is instantiated and a try catch block is used to catch exceptions generated from a duplicate user, an invalid credit card, or an unauthorized credit card.

命令 bean 被实例化，try catch 块被用于捕捉由于重复的用户、无效的信用卡或未经认证的信用卡而产生的异常。

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Exceeding expected values or boundaries of the application's function (e.g., does the right error handling get triggered when entering an invalid credit card number?)

超过应用程序功能的期望值或界限(例如，当输入无效的信用卡号时，恰当的错误处理启动了吗？)

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