Using MenuListener to listen to: menu canceled, selected and deselected events : JMenu « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. JMenu

With a registered MenuListener, you're notified when a JMenu is selected before the pop-up menu is opened with the menu's choices.

public interface MenuListener extends EventListener {
  public void menuCanceled(MenuEvent e);
  public void menuDeselected(MenuEvent e);
  public void menuSelected(MenuEvent e);
}

import java.awt.event.KeyEvent;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.event.MenuEvent;
import javax.swing.event.MenuListener;

public class ContructMenuWithAction {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("MenuSample Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar menuBar = new JMenuBar();

    // File Menu, F - Mnemonic
    JMenu fileMenu = new JMenu("File");
    fileMenu.setMnemonic(KeyEvent.VK_F);
    menuBar.add(fileMenu);

    fileMenu.addMenuListener(new MenuListener() {

      public void menuSelected(MenuEvent e) {
        System.out.println("menuSelected");
      }

      public void menuDeselected(MenuEvent e) {
        System.out.println("menuDeselected");

      }

      public void menuCanceled(MenuEvent e) {
        System.out.println("menuCanceled");

      }
    });

    // File->New, N - Mnemonic
    JMenuItem newMenuItem = new JMenuItem("New");
    fileMenu.add(newMenuItem);

    frame.setJMenuBar(menuBar);
    frame.setSize(350, 250);
    frame.setVisible(true);
  }
}

14.21.JMenu
	14.21.1.	The JMenu component is the basic menu item container that is placed on a JMenuBar
	14.21.2.	what menus look like
	14.21.3.	Adding a Menu to a Window
	14.21.4.	Add Separator to JMenu
	14.21.5.	Using Action Objects with Menus
	14.21.6.	Adding Menu Shortcuts
	14.21.7.	Set Mnemonic key
	14.21.8.	Submenu
	14.21.9.	Listening to JMenu Events with a ChangeListener: register a ChangeListener with a JMenu
	14.21.10.	Using MenuListener to listen to: menu canceled, selected and deselected events
	14.21.11.	Layout menu yourself
	14.21.12.	Customizing JMenu Look and Feel