Re: jLabel setVisible(true) Doesn't Work

From:

Jeff Higgins <jeff@invalid.invalid>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 07 Aug 2012 19:08:54 -0400

Message-ID:

<jvs6uv$1df$1@dont-email.me>

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();
       }
     });
   }
}