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copied!<p>Your while loop is stopping the repaint manager from ever getting around to changing the colors.</p> <p>You need to, some how, execute the request in the background, something like this</p> <pre><code>public class TestLabel extends JLabel { private Timer timer; private int r = 0; private int g = 155; private int b = 12; public TestLabel() { setText("Hello world"); setOpaque(true); timer = new Timer(1000, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.out.println("tick"); r = (r + 1) % 255; g = (g + 1) % 255; b = (b + 1) % 255; Color color = new Color(r, g, b); setBackground(color); System.out.println(color); if (r == 0 && b == 0 && g == 0) { r = 0; g = 155; b = 12; } invalidate(); revalidate(); repaint(); } }); timer.setRepeats(true); timer.setCoalesce(true); timer.start(); } } </code></pre> <p>You might like to read up on</p> <ul> <li><a href="http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CFIQFjAA&url=http://docs.oracle.com/javase/tutorial/uiswing/concurrency/dispatch.html&ei=WZclUM9mppyIB8vFgLAB&usg=AFQjCNEV-IbRLqmbImNIyRXEWy5L7ZP9tw&sig2=VlMYjPURnV_J4TwKUbT7cw" rel="nofollow">The Event Dispatching Thread</a></li> <li><a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html" rel="nofollow">Concurrency in Swing</a></li> </ul> <p><strong>UPDATED with Extended Example</strong></p> <pre><code>public class TestLabel extends JLabel { private Timer timer; private Object[][] colors = {{"Black", Color.BLACK}, {"Blue", Color.BLUE}, {"Cyan", Color.CYAN}, {"Dark Gray", Color.DARK_GRAY}, {"Gray", Color.GRAY}, {"Green", Color.GREEN}, {"Light Gary", Color.LIGHT_GRAY}, {"Mangenta", Color.MAGENTA}, {"Orange", Color.ORANGE}, {"Pink", Color.PINK}, {"Red", Color.RED}, {"White", Color.WHITE}, {"Yellow", Color.YELLOW}}; public TestLabel() { setText("Hello world"); setOpaque(true); timer = new Timer(1000, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.out.println("tick"); int index = (int) Math.round((colors.length - 1) * Math.random()); Object[] group = colors[index]; setBackground((Color)group[1]); setText((String)group[0]); } }); timer.setInitialDelay(0); timer.setRepeats(true); timer.setCoalesce(true); timer.start(); } } </code></pre>

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