Java jssc - 将值传递给SerialEvent中的另一个类

I'm making a project that uses a login form and accesses an Arduino using the serial port. I must send a String to the Arduino as the application starts and wait for a response from the device to know its ready to operate before checking the login username and passwords are correct. I made two classes, one called Login that checks username and password, and another called serial that contains the jssc implementation.I'm making a project that uses a login form and