Center a window on the screen

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    /**
     * Center a dialog box or window in the screen.  For example, in your constructor
     * or initializer, you can say SwingHelper.center(this).
     *
     *@param c Window, JWindow, Dialog, or JDialog to center
     */
    public static void center(Window c)
    {
        Dimension windowSize = c.getSize();
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        c.setLocation(screenSize.width/2 - windowSize.width/2, screenSize.height/2 - windowSize.height/2);
    }