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copied!<p>You can make use of the <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/event/MenuListener.html" rel="nofollow"><code>MenuListener</code></a> which should provide you information about the state of the menu.</p> <p>This simple example creates a new menu item each time the menu is opened...</p> <pre><code>import java.awt.BorderLayout; import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.event.MenuEvent; import javax.swing.event.MenuListener; public class TestMenuBar { public static void main(String[] args) { new TestMenuBar(); } public TestMenuBar() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JMenuBar mb = new JMenuBar(); JMenu main = new JMenu("Test"); mb.add(main); main.addMenuListener(new MenuListener() { @Override public void menuSelected(MenuEvent e) { System.out.println("Selected"); JMenu menu = (JMenu) e.getSource(); menu.add(new JMenuItem("I'm dynamiclly created")); } @Override public void menuDeselected(MenuEvent e) { System.out.println("deselected"); } @Override public void menuCanceled(MenuEvent e) { System.out.println("Canceled"); } }); JFrame frame = new JFrame("Testing"); frame.setJMenuBar(mb); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.setSize(200, 200); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } } </code></pre>

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