JPanel doesn't update no matter what I try

Drew Wood

I'm making a small program that shows teams/players/then their twitter feeds, tweets, etc. My problem doesn't seem to be related to this, it's just that my jPanel is not updating. I'm so far in my project that I keep throwing random code snippets in methods to get it done, so once I click on something, the "left" jpanel is either replaced with jbuttons or jbuttons are put in it, I tried before. Here's the code snippet I've been trying to get to work, just not doing what I expected.

public void mousePressed(MouseEvent e) {        
    System.out.println("You clicked on " + ap.getTeams()  [addPlayers.OPTIC].getTeamName());
        for(int i = 0; i<4; i++){
            //JPanel temp = ap.makePanel(ap.getTeams()[ap.OPTIC].getPlayers().get(i).getTwitterScreenName());
            //temp.setBounds(0,(i*125),   450,125);
            //left.add(temp);

            JButton b = new JButton("Test");
            b.setBounds(30,30,30,30);
            left.add(b);
            left.revalidate();
            add(left);
            add(b);
            right.add(b);
            left.setVisible(false);
            left.setVisible(true);

            System.out.println(i);
        }
    }   
}

The commented out code is my main code, but I'm just using jbuttons for testing. As you can see, I just keep adding random bits, hopefully of some use. I've also tried calling it later, but sadly, it didn't work either. Not sure why jpanels aren't updating, but any feedback would be great, thanks.

Hovercraft full of eels
  1. Avoid null layouts and setBounds, as this results in a very inflexible GUI, and while they may look good on one platform, they will look bad on most other platforms or screen resolutions, and are hard to update and maintain. Instead, you will need to learn and learn layout managers, then nest JPanels, each using its own layout manager to create pleasing and complex GUIs that look good on all OSes.
  2. The best way to swap JPanels or any components is to use CardLayout .
  3. If you are still stuck, please post a minimal example program . This is the best way for us to actually see and experience your problem.
  4. Don't add components to multiple containers like using bJButton variables . You're actually adding it to three containers.
  5. You seem to be trying to add four JButtons to the container so that they have the same bounds, one just above the other? Sorry, but the more I look at your code, the trickier it gets. Again, stop this nonsense, learn about layout managers and use them in the Swing tutorial.
  6. "and i keep throwing random code segments in my method to make it so ..."- Throwing stuff on the wall to see what isn't a great inspiration for creating programs. Start with the knowledge base - here is the Swing tutorial and the Java API, then plan the program structure, then create the code.

Edit
you asked:

.....I'm asking what is the problem with the whole question not being updated?

If you don't use CardLayout and change the components manually, you need to call revalidate()sum on the container after the change repaint(), the container should be updated with its new components. If this doesn't solve the problem, there may be a problem in your code that isn't shown to us, and you'll create and post a minimal example program again . Again, this is the best way for us to really understand and experience your problem.

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