Code@Pig Home

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class HelloTray {
    static Image image = Toolkit.getDefaultToolkit().getImage("images/tray.gif");
    static TrayIcon trayIcon = new TrayIcon(image, "Tooltip!");
    public static void main(String[] args) {
        // check support
        if (!SystemTray.isSupported()) {
            System.out.println("Your system not support SystemTray");
        }
       
        // init menu
        MenuItem msgItem  = new MenuItem("ÏûÏ¢");
        MenuItem exitItem = new MenuItem("Í˳ö");
       
        msgItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(null, "ÎÒÊÇÒ»¸ö´óÏûÏ¢~~");
            }
        });
       
        exitItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
       
        PopupMenu popup = new PopupMenu();
        popup.add(msgItem);
        popup.add(exitItem);

        // init tray
        trayIcon.setPopupMenu(popup);
        trayIcon.setImageAutoSize(true);
        trayIcon.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.out.println("in here");
                trayIcon.displayMessage("Tester!", "Some action performed",
                    TrayIcon.MessageType.INFO);
            }
        });

        SystemTray tray = SystemTray.getSystemTray();
        try {
            tray.add(trayIcon);
        } catch (AWTException e) {
            System.err.println("TrayIcon could not be added.");
        }
    }
}
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static TrayIcon trayIcon = new TrayIcon(image, "Tooltip!");    // µÚ¶þ²ÎÊýÊÇ tips

trayIcon.displayMessage("Tester!", "Some action performed", TrayIcon.MessageType.INFO);

trayIcon.setPopupMenu(popup);