Threads - JavaTech: An Introduction to Scientific and Technical Computing with Java - page 283

*tocreate a digital clock. **/
public class ClockTimer1 extends Japplet
{

java.util.Timer fTimer;
// Need panel reference in run().
DateFormatPanel fClockPanel;

public void init () {
Container content - pane = getContentPane ();

// Create an instance of DrawingPanel
fClockPanel = new DateFormatPanel ();

// Add the DrawingPanel to the contentPane.
content - pane.add (fClockPanel);

}

public void start () {
// Create a timer.
fTimer = new java.util.Timer ();

// Start the timer immediately and then repeat calls
// to run in UpdateTask object every second.
fTimer.schedule (new UpdateTask (), 0, 1000);

}

/** Stop clock when web page unloaded. **/
public void stop () {
// Stop the clock updates.
fTimer.cancel ();

}

/** Use the inner class technique to define the
* TimerTask subclass to update the clock.**/
class UpdateTask extends java.util.TimerTask {
public void run () {
fClockPanel.repaint ();

}

}
} // class ClockTimer1

(Note that since we import both javax.swing.* and java.util.* it is
necessary to use the fully qualified type java.util.Timer when declaring the
fTimer variable. Without the full qualification, the compiler would not know
whether we wanted javax.swing.Timer or java.util.Timer .)