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Groups > comp.lang.java.programmer > #17379

Re: jLabel setVisible(true) Doesn't Work

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  To: clusardi2k
From: Jeff Higgins <jeff@invalid.invalid>

On 08/07/2012 06:22 PM, clusardi2k@aol.com wrote:
> On Tuesday, August 7, 2012 3:33:29 PM UTC-4, markspace wrote:
>   Your label has to be inside another component (a container) to be visible.
Changing a local variable will never work. Even changing an instance field 
won't work unless you've specially defined your own component somehow. Most 
Swing components are also containers. However normally you use JFrame and 
JPanel as your containers. Call the add method, or use the GUI layout tool to 
just drag and drop components onto one.
>
> Does anyone have a simple working project of this:
>
> (1) It has a form with a JPanel dragged from the swing control palette,
> (2) In the JPanel a Jlabel is dragged from the swing control palette.
> (3) The jlabel is set to invisible at the start of the project.
> (4) The project becomes visible when a button is pressed.
> (5) The project becomes invisible when a button is pressed.
>
> Thanks,

No. But here's a start. You'll need add the appropriate controls and handlers 
and wrap it in a project.

import javax.swing.JFrame;
import javax.swing.JLabel;

public class Scratch {

   private static void createAndShowGUI() {
     JFrame frame = new JFrame("Scratch");
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

     JLabel label = new JLabel("Scratch");
     frame.getContentPane().add(label);
     // label.setVisible(false);
     frame.pack();
     frame.setVisible(true);
   }

   public static void main(String[] args) {
     javax.swing.SwingUtilities.invokeLater(new Runnable() {
       public void run() {
         createAndShowGUI();
       }
     });
   }
}

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jLabel setVisible(true) Doesn't Work "clusardi2k" <clusardi2k@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
  Re: jLabel setVisible(true) Doesn't Work "markspace" <markspace@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
    Re: jLabel setVisible(true) Doesn't Work "clusardi2k" <clusardi2k@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
      Re: jLabel setVisible(true) Doesn't Work "Jeff Higgins" <jeff.higgins@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
        Layout Doesn't Work (was: jLabel setVisible(true) Doesn't Work) "Jeff Higgins" <jeff.higgins@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
          Re: Layout Doesn't Work (was: jLabel setVisible(true) Doesn't Work) "clusardi2k" <clusardi2k@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
            Re: Layout Doesn't Work "markspace" <markspace@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
              Re: Layout Doesn't Work "clusardi2k" <clusardi2k@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
                Re: Layout Doesn't Work "clusardi2k" <clusardi2k@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
                Re: Layout Doesn't Work "markspace" <markspace@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
                Re: Layout Doesn't Work "Jeff Higgins" <jeff.higgins@1:261/38.remove-r72-this> - 2012-08-08 20:06 +0000
                Re: Layout Doesn't Work "clusardi2k" <clusardi2k@1:261/38.remove-r72-this> - 2012-08-08 20:06 +0000
                Re: Layout Doesn't Work "markspace" <markspace@1:261/38.remove-k2r-this> - 2012-08-09 18:44 +0000
                Re: Layout Doesn't Work "Jeff Higgins" <jeff.higgins@1:261/38.remove-t9h-this> - 2012-08-10 18:39 +0000
                Re: Layout Doesn't Work "Jeff Higgins" <jeff.higgins@1:261/38.remove-t9h-this> - 2012-08-10 18:39 +0000
                Re: Layout Doesn't Work "Jeff Higgins" <jeff.higgins@1:261/38.remove-6gh-this> - 2012-08-10 19:41 +0000
            Re: Layout Doesn't Work "Jeff Higgins" <jeff.higgins@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
              Re: Layout Doesn't Work "Jeff Higgins" <jeff.higgins@1:261/38.remove-r72-this> - 2012-08-08 20:06 +0000
  Re: jLabel setVisible(true) Doesn't Work "John B. Matthews" <john.b..matthews@1:261/38.remove-qhs-this> - 2012-08-08 19:04 +0000
  Re: jLabel setVisible(true) Doesn't Work "Roedy Green" <roedy.green@1:261/38.remove-k2r-this> - 2012-08-09 18:44 +0000

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