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I actually didn't know about setLocationRelativeTo(null) Nice tip!

Thanks for the tip bloid! The tutorial has been updated to show this for Java 1.4 or newer.

setLocationRelativeTo(null) always centers on the main screen though. In a dual screen environement it might be annoying it the users launches the application on the second screen: the frame will show up on the first screen.

Well, like it or not, that's how most applications behave. If you're on a duel-head machine, you can expect certain weirdness like that.

And don't forget that;

frame.setLocationRelativeTo( parentFrame ) ;

works as well to keep your child forms nicely centered around their parents :-)

And yeah, my dual screen environment puts windows spanning the screen whether I do the sLRT() call or the window dimension stuff...

My dual screen gives the same problem. The only working method I've found is to use the Java 1.3 method (from the article), but instead of Toolkit.getScreenSize() I use this implementation of getScreenSize() (requires 1.4):

public static Dimension getScreenSize()
{
GraphicsEnvironment graphicsEnv = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice screenDev = graphicsEnv.getDefaultScreenDevice();
DisplayMode mode = screenDev.getDisplayMode();
return new Dimension(mode.getWidth(), mode.getHeight());
}

Great Tip seanf!! :-D Thanks for that!