Re: [JmenuItem] menuItem when clicking on menu item

Daniel Moyne <>
Mon, 29 Dec 2008 13:18:13 +0100
John B. Matthews wrote:

In article <4958486d$0$23155$>,
 Knute Johnson <> wrote:

Daniel Moyne wrote:

I have created the same ActionListener on a collection of menu items in
a loop like this :
for (int i = 0; i < NUMBER_OPENED_FILES + 1; i++) {
name =.....
menuItem = new JMenuItem(name);
menuItem.setName("menuItem_" + String.valueOf(i));
menuItem.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {

In my method actionPerformed I want to know which menu has been
clicked; I know it is ridiculous because normally :
(1) you attach an ActionListener at each menu item,
(2) and in general you do not care about the menu item clicked.

I can process the string evt to extract the identifier of the menu item
clicked as the desired information in recorded in evt ; any other ideas

You can override JMenuItem to include a index number (the OO folks will
cringe though) or you can put them in an ArrayList and get their index
that way. The latter is probably best.

Knute's right, but I couldn't resist trying this alternative:

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

 * @author John B. Matthews
public class FileMenu {

     public static void main(String[] args) {

         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 (new FileMenu()).create();

     void create() {
         File userDir = new File(System.getProperty("user.dir"));
         File[] files = userDir.listFiles();

         JMenu menu = new JMenu("Recent Files");
         for (File f : files) {
             if (f.isFile()) {
                 RecentFile rf = new RecentFile(f);
                 menu.add(new JMenuItem(rf.getAction()));
         JMenuBar bar = new JMenuBar();
         JFrame f = new JFrame("FileMenu");
         f.setSize(480, 320);

class RecentFile {

    private final File file;
    private final Action action;

    public RecentFile(final File file) {
        this.file = file;
        this.action = new AbstractAction(file.getPath()) {
            public void actionPerformed(ActionEvent ae) {
                    + " " + file.getAbsolutePath());

    public Action getAction() {
        return action;

thanks Johne I will try this to undertstand the mechanism first ; in my case I store the files used and opened in a properrties file for later use ; when a file is selectee and no more exist I remove it from the list and I update the menu as the user can retry very likely with another vone from the list but that should not be a problem to refactor the code for this.

What is the use of the EventQueue.invokeLater(new Runnable() ; is this a thread ?


Daniel Moyne (Nulix) \\|||// Machine : x86_64
Distribution : Ubuntu Feisty Fawn / --- \ ATI Radeon X300
kernel : 2.6.20-16-generic (' o-o ') KDE 3.5.7

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