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Demonstrating a System Tray That Responds to Selection

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);   } }