How to connect a dummy GUI in swing to the controller java application?

I have a dummy GUI written in swing, with the text fields needed for data input to the program and text fields needed for data output. How do i connect this to the separate controller program?|||This completely depends on how you can access or communicate with the separate controller program. For instance, if you have to run the controller from an operating system command line, or if you can send a HTTP request to it, or a web service request (just about the same as HTTP), or a if you can use a Java RMI request, or a Java JMX request, or one of many other possibilities.