class MainWindow extends JFrame{
    MainWindow(String s){
        super(s);
        this.setSize(800,600);
        this.setLocation(200, 100);
        Image image1=this.getToolkit().createImage("MainWindowImage.jpg");
        this.setContentPane(new XPanel(image1));
        this.setVisible(true);   
    }

    class XPanel{
        private Image image;
        public XPanel(Image image){
            this.image = image;
            setBackground(Color.BLACK);
        }
        @Override public void paintComponent(Graphics g){
            g.drawImage(image, 200, 100, this);
        }
    }
}