Here you can find the source of build(File appDir)
public static JMenu build(File appDir)
//package com.java2s; //License from project: Open Source License import java.awt.Desktop; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.net.URI; import javax.swing.JMenu; import javax.swing.JMenuItem; public class Main { public static JMenu build(File appDir) { JMenu helpMenu = new JMenu("Help"); JMenu manuals = buildManualsMenu(appDir); if (manuals.getItemCount() > 0) { helpMenu.add(manuals);/* w ww . j av a2 s.c om*/ helpMenu.addSeparator(); } helpMenu.add(buildWebsiteMenuItem()); helpMenu.add(buildForumMenuItem()); return helpMenu; } static JMenu buildManualsMenu(File appDir) { JMenu manuals = new JMenu("Manuals"); File manualsDir = new File(appDir.getPath() + File.separatorChar + "manual"); if (manualsDir.exists() && manualsDir.isDirectory()) { for (File manualDirContent : manualsDir.listFiles()) { if (manualDirContent.isDirectory()) { for (final File manual : manualDirContent.listFiles()) { if (manual.getName().contains(".pdf")) { JMenuItem manualAction = new JMenuItem( manualDirContent.getName()); manualAction .addActionListener(new ActionListener() { @Override public void actionPerformed( ActionEvent e) { try { Desktop.getDesktop().open( manual); } catch (Exception exception) { exception.printStackTrace(); } } }); manuals.add(manualAction); } } } } } return manuals; } static JMenuItem buildWebsiteMenuItem() { JMenuItem website = new JMenuItem("Website"); website.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if (Desktop.isDesktopSupported()) { Desktop desktop = Desktop.getDesktop(); try { desktop.browse(new URI("http://unitexgramlab.org")); } catch (Exception exception) { exception.printStackTrace(); } } } }); return website; } static JMenuItem buildForumMenuItem() { JMenuItem forum = new JMenuItem("Forum"); forum.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if (Desktop.isDesktopSupported()) { Desktop desktop = Desktop.getDesktop(); try { desktop.browse(new URI( "http://forum.unitexgramlab.org")); } catch (Exception exception) { exception.printStackTrace(); } } } }); return forum; } }