How to run threads in background

hi everyone!
I need some hints on my problem!
I have an application with some working threads. When the user minimizes the app the app should go to the system tray and the threads should keep working.
I already know how to put an icon with popup menu in the systray. Now, how can I run the working threads in background?
Can anybody help me?
C u,
Filipe

I said that because as far I understood the following code it just creates an icon and popup menu, right?
So, when the user minimizes the app I need to kill it, create the icon and popup menu and leave the threads working.
public class SystemTrayDemo extends JFrame
     private static final long serialVersionUID = 1L;
     public SystemTrayDemo()
          JPopupMenu menu = new JPopupMenu("Menu");
          JMenuItem menuItem1 = new JMenuItem("Menu1");
          JMenuItem menuItem2 = new JMenuItem("Menu2");
          JMenuItem menuItem3 = new JMenuItem("Menu3");
          JMenuItem menuItem4 = new JMenuItem("Exit");
          menu.add(menuItem1);
          menu.add(menuItem2);
          menu.add(menuItem3);
          menu.add(menuItem4);
          menuItem4.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent evt) {
                    System.exit(0);
          ImageIcon icon = new ImageIcon("database.png");
          TrayIcon trayIcon = new TrayIcon(icon, "Hello System Tray", menu);
          SystemTray tray = SystemTray.getDefaultSystemTray();
          tray.addTrayIcon(trayIcon);
     public static void main(String[] args)
          try
               javax.swing.UIManager.setLookAndFeel("com.sun.java.swing. plaf.windows.WindowsLookAndFeel");
          catch(Exception e)
               System.out.println(e);
          new SystemTrayDemo();
}}

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