Why doesn't the Card show up from the CardLayout:used JPanel,JFrame

Question

hello guys,
this is a question regarding. As I did not get nice responses i am posting again today.
http://forum.java.sun.com/thread.jsp?forum=57&thread=235761
Hi, I would like to re-arrange my question and put it in a simpler way. I have a frame(mainframes.java) with border layout. There is a panel on the west(borderlayout.west) which has a few buttons. The center panel(borderlayout.center) has a cardlayout and needless to mention that it contains a deck of panels. When I click on a button in the left panel, an appropriate panel in the deck should be displayed in the center panel. It's all simple so far, but here comes the real problem. I have designed my application in such a way that I have each of my panels in a separate class(each of which extend JPanel) and I am trying to integrate them all in my frame. When I click on the button on the left panel(p.s.:this panel is also in a separate class), then the appropriate panel should be displayed in the frame(i.e. in the center deck).
mainframes.java:-
//This is the local method which takes an argument from the invoking panel and displays the corresponding card in the deck.
void showpanel(String p1)
this.cardLayout2.show(CENTERPANEL,p1);
System.out.println("Inside showpanel "+ p1);
leftpanel.java:-
void B_LOGIN_actionPerformed(ActionEvent e) {
new mainframes().showpanel("lp");
// I am trying to display the card "lp" when I click on a button in the leftpanel, but I can only get the console output as "Inside showpanel lp". This shows that the method showpanel(String lp) is getting invoked but the required card is not being displayed. i.e. this.cardLayout2.show(CENTERPANEL,p1) seems to be not working.
Thanks for your time. Mail me, if you want to access the complete code, at [email protected]

Answer 1

I'd check to make sure 3 things...
1) You have added your Panels to the CardLayout Panel
2) You have added the CardLayoutPanel to the center of your BorderLayout JPanel
3) Try giving calls to validate()/invalidate() on the JPanel containing the CardLayoutPanel
void showpanel(String p1)
... invalidate()
this.cardLayout2.show(CENTERPANEL,p1);
System.out.println("Inside showpanel "+ p1);
... validate()
Otherwise, I may just need to check your source code, you can send to [email protected]