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    <p><img src="https://i.stack.imgur.com/Zgje9.png" alt="enter image description here"></p> <p>This uses a <code>JPopupMenu</code> to display information on a click, not the most recommended approach, as it's difficult to layout other components...but you could just as easily use a <code>JWindow</code> instead...</p> <pre><code>public class SystemTrayTest { public static void main(String[] args) { if (SystemTray.isSupported()) { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception ex) { } try { final JPopupMenu popup = new JPopupMenu(); popup.add(new JLabel("Charging (45%)", JLabel.CENTER)); popup.add(new JLabel("Charging", new ImageIcon(ImageIO.read(SystemTrayTest.class.getResource("/battery_connection.png"))), JLabel.LEFT)); popup.add(new JLabel("Power Saver", new ImageIcon(ImageIO.read(SystemTrayTest.class.getResource("/flash_yellow.png"))), JLabel.LEFT)); popup.add(new JSeparator()); JMenuItem exitMI = new JMenuItem("Exit"); exitMI.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.exit(0); } }); popup.add(exitMI); TrayIcon trayIcon = new TrayIcon(ImageIO.read(SystemTrayTest.class.getResource("/battery_green.png")), "Feel the power"); trayIcon.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { popup.setLocation(e.getX(), e.getY()); popup.setInvoker(popup); popup.setVisible(true); } }); SystemTray.getSystemTray().add(trayIcon); } catch (Exception ex) { ex.printStackTrace(); System.exit(0); } } }); } } } </code></pre> <p><strong>Updated with mouse over support</strong></p> <p>Cause I can't resist playing...</p> <p><img src="https://i.stack.imgur.com/uk2cm.png" alt="enter image description here"></p> <pre><code>public class SystemTrayTest { public static void main(String[] args) { new SystemTrayTest(); } public SystemTrayTest() { if (SystemTray.isSupported()) { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception ex) { } try { TrayIcon trayIcon = new TrayIcon(ImageIO.read(SystemTrayTest.class.getResource("/battery_green.png")), "Feel the power"); MouseHandler mouseHandler = new MouseHandler(); trayIcon.addMouseMotionListener(mouseHandler); trayIcon.addMouseListener(mouseHandler); SystemTray.getSystemTray().add(trayIcon); } catch (Exception ex) { ex.printStackTrace(); System.exit(0); } } }); } } public class MouseHandler extends MouseAdapter { private Timer popupTimer; private JWindow popup; private Point point; public MouseHandler() { popup = new JWindow(); ((JComponent)popup.getContentPane()).setBorder(new LineBorder(Color.LIGHT_GRAY)); popup.setLayout(new GridLayout(0, 1)); popup.add(new JLabel("Charging (45%)", JLabel.CENTER)); try { popup.add(new JLabel("Charging", new ImageIcon(ImageIO.read(getClass().getResource("/battery_connection.png"))), JLabel.LEFT)); popup.add(new JLabel("Power Saver", new ImageIcon(ImageIO.read(getClass().getResource("/flash_yellow.png"))), JLabel.LEFT)); } catch (IOException exp) { exp.printStackTrace(); } popup.pack(); popupTimer = new Timer(250, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if (point != null) { System.out.println(point); Rectangle bounds = getScreenViewableBounds(point); int x = point.x; int y = point.y; if (y &lt; bounds.y) { y = bounds.y; } else if (y &gt; bounds.y + bounds.height) { y = bounds.y + bounds.height; } if (x &lt; bounds.x) { x = bounds.x; } else if (x &gt; bounds.x + bounds.width) { x = bounds.x + bounds.width; } if (x + popup.getWidth() &gt; bounds.x + bounds.width) { x = (bounds.x + bounds.width) - popup.getWidth(); } if (y + popup.getWidth() &gt; bounds.y + bounds.height) { y = (bounds.y + bounds.height) - popup.getHeight(); } popup.setLocation(x, y); popup.setVisible(true); } } }); popupTimer.setRepeats(false); } @Override public void mouseExited(MouseEvent e) { System.out.println("Stop"); point = null; popupTimer.stop(); popup.setVisible(false); } @Override public void mouseMoved(MouseEvent e) { popupTimer.restart(); point = e.getPoint(); } @Override public void mouseClicked(MouseEvent e) { System.exit(0); } } public static GraphicsDevice getGraphicsDeviceAt(Point pos) { GraphicsDevice device = null; GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); GraphicsDevice lstGDs[] = ge.getScreenDevices(); ArrayList&lt;GraphicsDevice&gt; lstDevices = new ArrayList&lt;GraphicsDevice&gt;(lstGDs.length); for (GraphicsDevice gd : lstGDs) { GraphicsConfiguration gc = gd.getDefaultConfiguration(); Rectangle screenBounds = gc.getBounds(); if (screenBounds.contains(pos)) { lstDevices.add(gd); } } if (lstDevices.size() == 1) { device = lstDevices.get(0); } return device; } public static Rectangle getScreenViewableBounds(Point p) { return getScreenViewableBounds(getGraphicsDeviceAt(p)); } public static Rectangle getScreenViewableBounds(GraphicsDevice gd) { Rectangle bounds = new Rectangle(0, 0, 0, 0); if (gd != null) { GraphicsConfiguration gc = gd.getDefaultConfiguration(); bounds = gc.getBounds(); Insets insets = Toolkit.getDefaultToolkit().getScreenInsets(gc); bounds.x += insets.left; bounds.y += insets.top; bounds.width -= (insets.left + insets.right); bounds.height -= (insets.top + insets.bottom); } return bounds; } } </code></pre>
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    1. POHow do I add things to the system tray and add mouseOver() functionality?
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    1. CO`JWindow` is basically like a `JPanel` that can be shown on the screen, correct ?
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    2. CONo, not really. `JWindow` is more like an undecorated `JFrame` (`JFrame` extends from `JWindow`)
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    3. COI knew the hierarchy, was just giving a simile :) If you are still in the mood for some more Java: http://stackoverflow.com/questions/14375338/cannot-play-embedded-sound-in-a-jar-file
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