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Java’s Applet Skeleton

posted Oct 11 1 min read

An Applet Skeleton

All but the most trivial applets override a set of methods that provides the basic mechanism by which the browser or applet viewer interfaces to the applet and controls its execution. Four of these methods—init( ), start( ), stop( ), and destroy( )—are defined by Applet. Another, paint( ), is defined by the AWT Component class. Default implementations for all of these methods are provided. Applets do not need to override those methods they do not use. However, only very simple applets will not need to define all of them. These five methods can be assembled into the skeleton shown here:

public class AppletSkel extends Applet { 
            // Called first. 
           public void init() {
                           // initialization 
           } 
           /* Called second, after init(). Also called whenever the applet is restarted. */ 
           public void start() {
                           // start or resume execution 
           } 
           // Called when the applet is stopped.
            public void stop() { 
                          // suspends execution 
           } 
           /* Called when applet is terminated. This is the last method executed. */ 
           public void destroy() { 
                          // perform shutdown activities 
           } 
           // Called when an applet's window must be restored. 
           public void paint(Graphics g) {
                           // redisplay contents of window 
           }
   }

Although this skeleton does not do anything, it can be compiled and run

It is important to understand the order in which the various methods shown in the skeleton are called. When an applet begins, the AWT calls the following methods, in this sequence:
1. init( )
2. start( )
3. paint( )

When an applet is terminated, the following sequence of method calls takes place:
1. stop( )
2. destroy( )

Let’s look more closely at these methods.

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