//  A trivial applet that tests the StopWatchRunner component.
//  The applet just creates and shows a StopWatchRunner.
    
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
    
public class Stop extends JApplet 
{
    
	public void init() 
    	{
		StopWatchRunner watch = new StopWatchRunner();
		watch.setFont( new Font("SansSerif", Font.BOLD, 24) );
		watch.setBackground(Color.white);
		watch.setForeground( new Color(180,0,0) );
		watch.setOpaque(true);
		getContentPane().add(watch, BorderLayout.CENTER);
          
	}
}
    
//       A component that acts as a simple stop-watch.  When the user clicks
//       on it, this component starts timing.  When the user clicks again,
//       it displays the time between the two clicks.  Clicking a third time
//       starts another timer, etc.  While it is timing, the label just
//       displays the whole number of seconds since the timer was started.
    
    class StopWatchRunner extends JLabel implements MouseListener, ActionListener 
{

       private long startTime;   // Start time of stopwatch.
                                 //   (Time is measured in milliseconds.)

       private boolean running;  // True when the stopwatch is running.

       private Timer timer;  // A timer that will generate events
                             // while the stopwatch is running

       public StopWatchRunner() 
       {
             // Constructor.
          super("  Click to start timer.  ", JLabel.CENTER);
          addMouseListener(this);
       }

       public void actionPerformed(ActionEvent evt) 
       {
              // This will be called when an event from the
              // timer is received.  It just sets the stopwatch
              // to show the amount of time that it has been running.
              // Time is rounded down to the nearest second.
           long time = (System.currentTimeMillis() - startTime) / 1000;
           setText("Running:  " + time + " seconds");
       }

       public void mousePressed(MouseEvent evt) 
       {
              // React when user presses the mouse by
              // starting or stopping the stopwatch.  Also start
              // or stop the timer.
          if (running == false) 
          {
                // Record the time and start the stopwatch.
             running = true;
             startTime = evt.getWhen();  // Time when mouse was clicked.
             setText("Running:  0 seconds");
             if (timer == null) 
             {
                timer = new Timer(100,this);
                timer.start();
             }
             else
                timer.restart();
          }
          else 
          {
                // Stop the stopwatch.  Compute the elapsed time since the
                // stopwatch was started and display it.
             timer.stop();
             running = false;
             long endTime = evt.getWhen();
             double seconds = (endTime - startTime) / 1000.0;
             setText("Time: " + seconds + " sec.");
          }
       }

       public void mouseReleased(MouseEvent evt) { }
       public void mouseClicked(MouseEvent evt) { }
       public void mouseEntered(MouseEvent evt) { }
       public void mouseExited(MouseEvent evt) { }

}  // end StopWatchRunner

(Applet "Stop" would be displayed here
if Java were available.)