Need help and advice on designing relations of classes

Question

I tried to use JInternalFrame which contains an extension of JPanel as the UI content (with actionListener for the buttons inside it). The Panel is contained in a JScrollPane.
jIntFrm = new JInternalFrame("-Title-", true, true, true, true);
jIntFrm.setLayout(FlowLayout());
jIntFrm.add(new JScrollPane(new PnlEntry()));
The user clicked the button inside the panel (PnlEntry) to close the JInternalFrame containing this panel or another button to do operations that will need to display another JInternalFrame containing another extension of JPanel.
Please give me advices on how these should be done, so that it makes good OO relations.
Right now, I'mdoing it like this:
public class mainFrame extends JFrame{
JInternalFrame jIntFrm; //AND OTHER INTERNAL FRAME
jIntFrm = new JInternalFrame("-Title-", true, true, true, true);
jIntFrm.setLayout(FlowLayout());
//THE PANEL IS GIVEN THE REF AND MEMORIZE IT UNTIL IT
//INVOKES mainFrame.panelExit(JInternalFrame)
jIntFrm.add(new JScrollPane(new PnlEntry(this, jIntFrm)));
panelExit(JInternalFrame jif){
if(jif == jIntFrm){
jIntFrame.dispose();
jIntFrame = null;
panelContinueProcess(JInternalFrame jif, Object someID){
if(jif == jIntFrm){
jIntFrame.dispose();
jIntFrame = null;
//start displaying another JInternalFrame with the appropriate Panel in it
Is this all is OK?
Please give me your advice
Thx,
David

Answer 1

Maybe read on MVC (Model-View-Controller) pattern? It's practically the standard for Swing applications (even Swing itself follows the pattern).
You don't want to clutter your frame with behavioral code.