Date: Fri, 21 Sep 2007 06:30:25 +0200 From: Pieter de Goeje <pieter@degoeje.nl> To: freebsd-questions@freebsd.org Subject: Re: Strange Java behaviour Message-ID: <200709210630.25709.pieter@degoeje.nl> In-Reply-To: <bef9a7920709201931x15cec9ddq21c080aca45d3de8@mail.gmail.com> References: <bef9a7920709201931x15cec9ddq21c080aca45d3de8@mail.gmail.com>
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On Friday 21 September 2007, Aryeh Friedman wrote:
> On every JDK (linux-sun-jdk14,jdk15,diablo-jdk15,linux-sun-jdk16 and
> jdk16) I have tried this on it opens the JFrame then just dies
> (immediatly):
>
> import javax.swing.JFrame;
>
> public class Main
> {
> public static void main(String[] args)
> {
> JFrame frame=new JFrame();
>
> frame.pack();
> frame.setVisible(true);
>
> while(true)
> ;
> }
> }
>
> I am using FreeBSD 7-Current with xorg 7.3 (gnome)
Your code is wrong. You cannot do GUI creation / updating outside the
Swing/AWT event dispatching thread. Also, the while(true); is unnessecary
(and a waste of CPU time) because java does not terminate while there are
active threads.
For more information:
http://java.sun.com/docs/books/tutorial/uiswing/concurrency/
Example:
import javax.swing.*;
public class Main {
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
JFrame f = new JFrame("Hello");
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.setVisible(true);
}
});
}
}
Regards,
Pieter de Goeje
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