Java CDC application...Form Display

Hello,
I am doing some exercises on CDC (Connected Device Configuration) type application. Basically I am novice in this environment and technology. I am facing a problem. The problem is too simple. I have a class named Main.java. I have added a JFrame form with the project.

Now I would like to show the “JFrame form” from a button click event of “Main.java”. Can anybody help me in this context? Which method or API should I call to display the form?

Thanks,

Tapas.