请教各位java高手，谁能告诉我如何在GUI窗口的菜单下添加一行工具条！！！

Question

JPanel contentPane;
  JMenuBar jMenuBar1 = new JMenuBar();
  JMenu jMenuServer = new JMenu();
  JMenuItem jMenuFileExit = new JMenuItem();
  JMenu jMenuHelp = new JMenu();
  JMenuItem jMenuHelpAbout = new JMenuItem();
  JToolBar jToolBar = new JToolBar();  JLabel statusBar = new JLabel();
  BorderLayout borderLayout1 = new BorderLayout();
  JSplitPane jSplitPane1 = new JSplitPane();
  JScrollPane DBTreeScrollPane = new JScrollPane();

DBTreeManager treeManager = null;  JMenu jMenuDatabase = new JMenu();
  JMenuItem jMenuItem1 = new JMenuItem();
  .....
  
  JButton jButton1 = new JButton();
  .....private void jbInit() throws Exception  {    image1 = new ImageIcon(com.sharetop.myadmin.mainFrame.class.getResource("connect.gif"));
    image2 = new ImageIcon(com.sharetop.myadmin.mainFrame.class.getResource("disconnect.gif"));

.....    //setIconImage(Toolkit.getDefaultToolkit().createImage(mainFrame.class.getResource("[Your Icon]")));
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle(UIResource.getString("Product"));
    statusBar.setText(" ");    jMenuHelp.setText(UIResource.getString("Help"));
    jMenuHelpAbout.setText(UIResource.getString("About"));
    jMenuHelpAbout.addActionListener(new ActionListener()  {
      public void actionPerformed(ActionEvent e) {
        jMenuHelpAbout_actionPerformed(e);
      }
    });
  
    ......    jButton1.setIcon(image1);
    jButton1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        connect_actionPerformed(e);
      }
    });
    
    .......
    
    jButton1.setToolTipText(UIResource.getString("Connect"));
    jButton2.setToolTipText(UIResource.getString("Disconnect"));

.......    DBTreeScrollPane.setPreferredSize(new Dimension(120, 324));    .......
    
    jMenuItem10.setText(UIResource.getString("DeleteField"));
    jMenuItem10.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        deletefield_actionPerformed(e);
      }
    });    jToolBar.add(jButton1);
    
    .......
    
    jMenuServer.add(jMenuItem2);
    .......
    
    this.setJMenuBar(jMenuBar1);
    contentPane.add(jToolBar, BorderLayout.NORTH);
    contentPane.add(statusBar, BorderLayout.SOUTH);
    contentPane.add(jSplitPane1,  BorderLayout.CENTER);
    jSplitPane1.add(DBTreeScrollPane, JSplitPane.LEFT);
    
  }