Swing-Based Form Refresh

Question

I'm working on a database querying tool using Java Swing and AWT for the GUI. One thing I'm having a problem with is refreshing the window after data on the form has changed. So if I change a fields data by use of "setText()", how do I get the window to refresh with that new information?
A temporary solution I came up with is sort of a "double buffer" technique in which I have two frames in main and I set one to null and create a new window with the other, and swap out every time I need to do that, while keeping track of the window's size and location. The problem is that I get a flicker every time it needs to change which can get annoying.

Answer 1

The way I've always created forms is through the constructor. (Is there any other way?) You create a new frame of that type that extends JFrame in main, and in the constructor, all the components are created, then added to the panel. So let's just say I have a JTextField that I type into and want that information displayed on the window appended to another JTextField (there is a purpose for this)...if I do this in the documentListener:
textField2.setText(textField1.getText());
this hasn't been automatically updating it. I also need other things like JLabels and ImageIcons to update when their information is changed, but that isn't happening either. Would a simple repaint() call to the super do the trick?