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Re: Weird window close be

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  Re: Weird window close be "Lew" <lew@THRWHITE.remove-dii-this> - 2011-04-27 15:46 +0000

#3722 — Re: Weird window close be

  To: comp.lang.java.gui
mrstephengross wrote:
> Javac: gcj-4.2 (GCC) 4.3.2 (Ubuntu 4.2.3-2ubuntu6)
> java: "1.5.0" gij (GNU libgcj) version 4.2.3 (Ubuntu 4.2.3-2ubuntu6)

I have Ubuntu 8, but I'm running real Java, not the pale imitation that GCJ 
seems to be.  I've never been able to get GCJ to work for me in the past.

So right away I suspect your problem is that you're using the wrong JVM.

> Ok, I looked up stuff on EDT and amended my code to use it (see
> below). However, the weird behavior still persists. Have I implemented
> it incorrectly?
> 
> === CODE FOLLOWS ===
> import javax.swing.JFrame;
> import javax.swing.JLabel;
> import javax.swing.SwingUtilities;
> 
> public class HelloWorldFrame {
> 
> 	public static void main(String args[]) {
> 		new HelloWorldFrame();

Doing things this way causes code to be executed from the constructor.  It 
likely doesn't matter much in this particular case, but it might be wise to 
break the habit so you aren't tempted when it really does matter.

> 	}
> 
> 	HelloWorldFrame() {
>             Runnable doWorkRunnable = new Runnable() {
>                     public void run() {
>                         JFrame frame = new JFrame();
>  
> frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
>                             frame.setSize(100, 100);
>                             frame.getContentPane().add(new
> JLabel("hi"));
>                             frame.setVisible(true);
>                     }
>             };
>             SwingUtilities.invokeLater(doWorkRunnable);
> 	}
> }

Here's my recast to avoid doing anything besides construction in the constructor:

<sscce file="testit/HelloWorldFrame.java" >
package testit;

import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

/** Investigate whether frame closes after mouse passes over the frame.
  */
public class HelloWorldFrame implements Runnable
{
     private JFrame frame = new JFrame();

     @Override
     public void run()
     {
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.getContentPane().add(new JLabel("hi"));

         Dimension dim = new Dimension( 100, 100 );
         frame.setPreferredSize( dim );

         frame.pack();
         frame.setVisible(true);
     }

     /** main.
      * @param args the command line arguments
      */
     public static void main( String[] args )
     {
         SwingUtilities.invokeLater( new HelloWorldFrame() );
     }
}
</sscce>

> I move the mouse first over the content pane, 
> THEN over the CLOSE button and click it. 
> The window does NOT close.

Running this code against Sun's Java 6u10, the window closes even after I 
mouse over the pane.

Maybe I'm right about GCJ being the problem.  Have you tried using Java?

-- 
Lew

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