Basic structure of an applet

Contents
Introduction
Basic structure of an applet
Move a ball
Double buffering
Ball bouncing and change the direction
Using sound in applets
Using pictures in applets
Mouse events
Keyboard events
The first complete game
Artificial intelligence for a pong like game
Generation of random 2D landscapes

Well, this is very simple and the basic structure of an applet will be the same for every applet you will program. The major difference between an applet and an application is that there is no public static void main (String[]args) - method in an applet! Instead every applet should implement the following methods:

// import necessary packages
import java.applet.*;
import java.awt.*;

// Inherit the applet class from the class Applet
public class FirstApplet extends Applet
{

    // Now you should implement the following methods

    // init - method is called the first time you enter the HTML site with the applet
    public void init() {... }

    // start - method is called every time you enter the HTML - site with the applet
    public void start() {... }

    // stop - method is called if you leave the site with the applet
    public void stop() {... }

    // destroy method is called if you leave the page finally (e. g. closing browser)
    public void destroy {... }

    /** paint - method allows you to paint into your applet. This method is called e.g. if you move your browser window or if you call repaint() */
    public void paint (Graphics g) { }

}

To insert an applet to a HTML - site you have to add the following lines to your HTML document.

<html>
<body>
<p><applet code ="FirstApplet.class" width=700 height=400>
</applet></p>
</body>
</html>

This is the most important line: <p><applet code ="FirstApplet.class" width=700 height=400> .

  1. applet code ="FirstApplet.class" tells the browser where to find the "extends Applet" - class.
  2. width and height tell the browser how big the applet should be

To learn other html - tags please search for a tutorial in the internet.

Next chapter

Moving a ball

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