Threads - JavaTech: An Introduction to Scientific and Technical Computing with Java - page 277

Figure 8.7 Output of the
DataSyncApplet program
with Sensor and
DataGetter classes.

floor and gradually comes to a rest (see Figure 8.8). The interface consists of a
subclass of JPanel called Drop2DPanel and a button to initiate a new drop of
the ball. Drop2DPanel displays the ball and calculates its position.
The applet implements Runnable and in the start() method it creates
a thread to which it passes a reference to itself. The applet's run() method
first does some initialization and then enters a loop that draws each frame of the
animation. The loop begins with a 25 millisecond pause using the static sleep()
method in the Thread class. Then the Drop2DPanel is told to paint the next
frame. If the drop is done, the process jumps from the loop and exits the run()
method, thus killing this thread.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

Figure 8.8 The
Drop2DApplet program
demonstrates how to
create a simple
animation by simulating
a dropped ball that
bounces when it hits the
floor and gradually
comes to rest.

/** This applet implements Runnable and uses a thread
*tocreate a simple dropped ball demonstration.**/
public class Drop2DApplet extends JApplet
implements Runnable, ActionListener

{

// Will use thread reference as a flag