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copied!<p>I'm not sure why you're changing the label's <a href="https://stackoverflow.com/a/2234020/230513">transparency</a>. Making the label <a href="http://java.sun.com/products/jfc/tsc/articles/painting/index.html#props" rel="nofollow noreferrer">opaque</a> and adjusting it's background <a href="https://stackoverflow.com/questions/2123841/javax-swing-timer-repeats-fine-but-actionlistener-doesnt-do-anything/2124507#2124507">saturation</a> may be sufficient, as shown below.</p> <p>A few notes on your implmentation:</p> <ul> <li>Kudos for using the <a href="http://download.oracle.com/javase/tutorial/uiswing/concurrency/initial.html" rel="nofollow noreferrer">event dispatch thread</a>.</li> <li>Let the layout do the work; use <code>setSize()</code> <a href="https://stackoverflow.com/a/7229662/230513">sparingly</a>.</li> <li>Don't mix AWT and Swing components needlessly. </li> <li>Don't swallow exceptions.</li> </ul> <p><img src="https://i.stack.imgur.com/MnBKC.png" alt="enter image description here"></p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextArea; import javax.swing.SwingUtilities; public class MouseTester extends JFrame { private static MouseTester mt; private static Color labelBackgroundColor = Color.gray; private static Color labelForegroundColor = Color.white; private JLabel mouseLocation; public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { MouseTester.createMouseTester(); } }); } public static void createMouseTester() { mt = new MouseTester(); mt.setVisible(true); } private MouseTester() { this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); mouseLocation = new JLabel("Lat/Long", JLabel.CENTER); mouseLocation.setOpaque(true); mouseLocation.setBackground(labelBackgroundColor); mouseLocation.setForeground(labelForegroundColor); mouseLocation.setToolTipText("The MGRS coordinates."); JTextArea textArea = new JTextArea( "Move mouse here to see mouse motion info..."); textArea.addMouseMotionListener(new MouseMotionAdapter() { @Override public void mouseMoved(MouseEvent me) { mouseLocation.setText("Mouse moved [" + me.getX() + ", " + me.getY() + "]"); } }); this.add(textArea, BorderLayout.CENTER); this.add(mouseLocation, BorderLayout.SOUTH); this.pack(); this.setSize(320, 240); // content placeholder this.setLocationRelativeTo(null); } } </code></pre>

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