class DisplayGraphics1 extends Canvas{

    public void paint(Graphics g) {
        g.drawString("Hello",40,40);
        setBackground(Color.WHITE);
    }
}

public class LayeredTest extends Canvas implements GLEventListener{

    static DisplayGraphics1 m = new DisplayGraphics1();
    static final JFrame frame = new JFrame ( "Game" );

    public static void main( String[] args ) {

    //... creating glcanvas
    frame.getContentPane().add( glcanvas );
    frame.setSize( frame.getContentPane().getPreferredSize() );
    frame.setVisible( true );

    }

    @Override
    public void display( GLAutoDrawable drawable ) {

        if(clickedOnHighscore) { frame.getContentPane().add( m ); }

    }
}