Создание и запуск Applet в NetBeans

public class MainApplet extends Applet {
 
    /**
     * Initialization method that will be called after the applet is loaded into
     * the browser.
     */
    public void init() {
        // TODO start asynchronous download of heavy resources
 
       JPanel panel = new JPanel();
   panel.setLayout(new FlowLayout(FlowLayout.CENTER));
   panel.setBackground(Color.WHITE);
   this.setContentPane(panel);
    }
    
    public void start(){
    
    }
    
    public void update (java.awt.Graphics g){
    
    }
    public void paint(Graphics g) {
        g.drawLine(0, 0, getSize().width, getSize().height);
        g.drawLine(0, getSize().height, getSize().width,0);
    }
 
 
    // TODO overwrite start(), stop() and destroy() methods
 
    private void setContentPane(JPanel panel) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
}
 
 
public class JApplet {
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        
        java.awt.EventQueue.invokeLater(new Runnable() {
             public void run(){ {MainApplet applet=new MainApplet();
        applet.setSize(300,300);
        applet.setBackground(Color.WHITE);
        applet.setVisible(true);
        applet.repaint();
             }
                 
             }
         });
        
    }
    
}