Hi can sombody help me I cant add the actionlistener to my application

Question

hi
I write a code in java whit the JMenuBar and MenuBarIthem the problem is when I click to my MenuBarIthm I must to get a JPanel in the same window code but when i click to the MenuIthel dnt work
* @(#)re.java
* @author
* @version 1.00 2009/5/30
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.*;
import javax.swing.*;
public class re extends JFrame   {
     public      JFrame f=new JFrame();
      private JMenuItem blueMenuItem;
    private JMenuItem orangeMenuItem;
        private JMenuItem greenMenuItem;
    private JMenu SweetMenu;
    private JMenuItem Chambre12MenuItem;
    private JMenuItem Chambre13MenuItem;
    private JMenuItem Chambre14MenuItem;
    private JMenuItem Chambre15MenuItem;
    private JMenu TripleMenu;
   private javax.swing.JMenu singleMenu;
    private JMenuItem Chambre6;
    private JMenuItem Chambre7MenuItem;
     private JMenuItem Chambre8MenuItem;
      private JMenuItem Chambre9MenuItem;
       private JMenuItem Chambre10MenuItem;
        private JMenuItem Chambre11MenuItem;
    private JMenu DoubleMenu;
      private javax.swing.JMenuItem chambreMenuItem;
    public re() {
            JMenuBar menuBar = new JMenuBar();
        menuBar.setMargin(new java.awt.Insets(30, 40, 30, 50));
        menuBar.setMinimumSize(new java.awt.Dimension(500, 550));
        singleMenu = new JMenu();
        singleMenu.setText("Single");
        menuBar.add(singleMenu);
       chambreMenuItem = new JMenuItem();
        chambreMenuItem.setText("Chamber1");
        singleMenu.add(chambreMenuItem);
          menuBar.setDebugGraphicsOptions(javax.swing.DebugGraphics.NONE_OPTION);
        menuBar.setMargin(new java.awt.Insets(30, 40, 30, 50));
        menuBar.setMinimumSize(new java.awt.Dimension(500, 550));
     chambreMenuItem.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent e) {
                  JPanel jpanel_1 = new JPanel(new GridLayout(0,1));
      jpanel_1.setBackground(Color.cyan);
      for(int i=0;i<7;++i) jpanel_1.add(new JLabel("  label"+i+"  "));
Container cp = f.getContentPane();
      cp.add(jpanel_1,BorderLayout.EAST);
         f.setVisible(true);
              f.setJMenuBar(menuBar);
    //     f.setSize(500,300);
         f.setExtendedState(f.MAXIMIZED_BOTH);
    f.setDefaultCloseOperation(3);
    public static void main (String[] args) {
         new re();
}

Answer 1

1. When posting code here or on any forum, please remove useless comments and format the code correctly. ([http://java.sun.com/docs/codeconv/html/CodeConvTOC.doc.html]) -- use 2 to 4 spaces for indents, not tabs, as the forum doesn't handle tab characters very well.
2. Always launch a GUI on the EDT using SwingUtilities / EventQueue#invokeLater.
3. When adding or removing components to/from a visible component hierarchy, it is necessary to revalidate() and sometimes, to also repaint() the container(s) whose contents are changed.
db
edit
4. Don't use 'Magic Numbers'.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE), not 3.
Edited by: DarrylBurke