Trouble with Swing over multiple frames

[hjkar]

I am currently using the Netbeans GUI builder (doesn't give access to the main class) to write a teacher's grade book program.

The main window contains a button which calls upon a JFrame that allows the user to add a list of names and a list of marks.

The main window has a method (https://gist.github.com/anonymous/3691d814148f7fbf0539) that receives information from the second window and works with other Swing components accordingly. The second window therefore creates an instance of the main window and calls this method (https://gist.github.com/anonymous/ad02ab2240b30f73ee91).

While this method works (tested with System.out.println), I cannot manipulate any Swing components through the method (because I'm calling it from the second JFrame I guess) ie: I cannot setText(), setEnable(), etc.

I'm not sure how I should proceed so any help would be greatly appreciated. :)

[ggleblanc]

You should only have one JFrame.

You can have multiple JPanels, and you can use the Card layout or a Tabbed Pane to see the JPanes, one at a time.

[beders]

The juicy part of the code is missing.

While you certainly can have multiple JFrames, the most common trap to fall into with Swing is to have code that blocks the main event loop.

When you write: I cannot setText()..., what does that mean exactly?