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    <p>You have to update the text in a separate thread every second. </p> <p>Ideally you should update swing component only in the EDT ( event dispatcher thread ) but, after I tried it on my machine, using <a href="http://java.sun.com/javase/6/docs/api/java/util/Timer.html#scheduleAtFixedRate%28java.util.TimerTask,%20long,%20long%29" rel="noreferrer">Timer.scheduleAtFixRate</a> gave me better results:</p> <p><a href="http://img175.imageshack.us/img175/8876/capturadepantalla201006o.png" rel="noreferrer">java.util.Timer http://img175.imageshack.us/img175/8876/capturadepantalla201006o.png</a></p> <p>The javax.swing.Timer version was always about half second behind:</p> <p><a href="http://img241.imageshack.us/img241/2599/capturadepantalla201006.png" rel="noreferrer">javax.swing.Timer http://img241.imageshack.us/img241/2599/capturadepantalla201006.png</a></p> <p>I really don't know why.</p> <p>Here's the full source:</p> <pre><code>package clock; import javax.swing.*; import java.util.*; import java.text.SimpleDateFormat; class Clock { private final JLabel time = new JLabel(); private final SimpleDateFormat sdf = new SimpleDateFormat("hh:mm"); private int currentSecond; private Calendar calendar; public static void main( String [] args ) { JFrame frame = new JFrame(); Clock clock = new Clock(); frame.add( clock.time ); frame.pack(); frame.setVisible( true ); clock.start(); } private void reset(){ calendar = Calendar.getInstance(); currentSecond = calendar.get(Calendar.SECOND); } public void start(){ reset(); Timer timer = new Timer(); timer.scheduleAtFixedRate( new TimerTask(){ public void run(){ if( currentSecond == 60 ) { reset(); } time.setText( String.format("%s:%02d", sdf.format(calendar.getTime()), currentSecond )); currentSecond++; } }, 0, 1000 ); } } </code></pre> <p>Here's the modified source using javax.swing.Timer</p> <pre><code> public void start(){ reset(); Timer timer = new Timer(1000, new ActionListener(){ public void actionPerformed( ActionEvent e ) { if( currentSecond == 60 ) { reset(); } time.setText( String.format("%s:%02d", sdf.format(calendar.getTime()), currentSecond )); currentSecond++; } }); timer.start(); } </code></pre> <p><sub><em>Probably I should change the way the string with the date is calculated, but I don't think that's the problem here</em></sub></p> <p>I have read, that, since Java 5 the recommended is: <a href="http://java.sun.com/javase/6/docs/api/java/util/concurrent/ScheduledExecutorService.html" rel="noreferrer">ScheduledExecutorService</a> I leave you the task to implement it.</p>
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    1. COInteresting, I wonder why it is a whole .5 seconds behind.
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    2. COI don't know, probably it was the startup time ( to get into the EDT or something ) but I couldn't recover them.
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