How can I make a JFrame pop up in the middle of the screen?

On my application I have a help button. The button is used to trigger a pop up JFrame containing my help messages. This JFrame keeps popping up at the top left corner of my screen. Is there a way to make it pop up in the middle of the screen? Anyone?

hi, try this:
public static void centerWindow(Window win){
Dimension screenSizeWithSpeedBar = Toolkit.getDefaultToolkit().getScreenSize();
Dimension screenSize = new Dimension(screenSizeWithSpeedBar.width,screenSizeWithSpeedBar.height-25);
Dimension frameSize = win.getSize();
if (frameSize.height > screenSize.height)
frameSize.height = screenSize.height;
if (frameSize.width > screenSize.width)
frameSize.width = screenSize.width;
win.setSize(frameSize);
win.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
It works with following arguments: JWindow, JFrame and JDialog

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