JFrame not displaying text.

[David Irwin]

I have a JFrame where I'm displaying some simple text information in a JPanel. However, when the application starts up the text is not displayed until I resize the frame. I imagine I'm initializing the frame incorrectly but is there something obvious that I'm not doing?

Example:

        Runnable update = new Runnable()
        {
            public void run()
            {
                // set the frame size
                setSize(screenXDim, screenYDim);
 
                // set the title of the frame
                setTitle("Test application");
 
                // build the frame
                cont.setLayout(new BorderLayout());
 
                // create the I/O panel
                cont.add(buildIOPanel(), BorderLayout.CENTER);
            }
        };
 
        // update the GUI
        SwingUtilities.invokeLater(update);
        repaint();

The

buildIOPanel

method call builds a JPanel with the text to be displayed.

Thanks for the help.

[Ernest Friedman-Hill]

If you're adding these components after the JFrame has already appeared on the screen, then you need to call validate() on the JFrame to get its contents to appear. Alternatively, you can set the whole GUI up before you call setVisible on the JFrame.