Ví dụ về System Tray đáp ứng chọn lựa từ user

import java.awt.AWTException; import java.awt.Image; import java.awt.MenuItem; import java.awt.PopupMenu; import java.awt.SystemTray; import java.awt.Toolkit; import java.awt.TrayIcon; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; public class ActiveTray { public static void main(String args[]) throws Exception{ if (SystemTray.isSupported() == false) { System.err.println("No system tray available"); return; } final SystemTray tray = SystemTray.getSystemTray(); PropertyChangeListener propListener = new PropertyChangeListener() { public void propertyChange(PropertyChangeEvent evt) { TrayIcon oldTray[] = (TrayIcon[]) evt.getOldValue(); TrayIcon newTray[] = (TrayIcon[]) evt.getNewValue(); System.out.println(oldTray.length + " / " + newTray.length); } }; tray.addPropertyChangeListener("trayIcons", propListener); Image image = Toolkit.getDefaultToolkit().getImage("jpgIcon.jpg"); PopupMenu popup = new PopupMenu(); MenuItem item = new MenuItem("Hello, World"); final TrayIcon trayIcon = new TrayIcon(image, "Tip Text", popup); ActionListener menuActionListener = new ActionListener() { public void actionPerformed(ActionEvent e) { trayIcon.displayMessage("Good-bye", "Cruel World", TrayIcon.MessageType.WARNING); } }; item.addActionListener(menuActionListener); popup.add(item); ActionListener actionListener = new ActionListener() { public void actionPerformed(ActionEvent e) { tray.remove(trayIcon); } }; trayIcon.addActionListener(actionListener); tray.add(trayIcon); } }