public   class  Main {
     public  Main() {
        JFrame frame =  new  MainFrame();
        Insets insets = 
            Toolkit.getDefaultToolkit().getScreenInsets( frame.getGraphicsConfiguration() );

        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

        frame.setSize( screenSize.width - insets.left - insets.right, 
                       screenSize.height - insets.bottom - insets.top );

        frame.setLocation(  0  + insets.left,  0  + insets.top );
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.setVisible( true );
    }

     public   static   void  main( String[] args ) {

         try  {
            UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName() );
        }
         catch  ( Exception e ) {
            e.printStackTrace();
        }
         new  Main();
    }
}