Example

The following example is made simple enough to illustrate the essential use of Java applets through its java.applet package. It also uses classes from the Java Abstract Window Toolkit (AWT) for producing actual output (in this case, the "Hello, world!" message).

import java.applet.Applet; import java.awt.*; // Applet code for the "Hello, world!" example. // This should be saved in a file named as "HelloWorld.java". public class HelloWorld extends Applet { // This method is mandatory, but can be empty (i.e., have no actual code). public void init { } // This method is mandatory, but can be empty.(i.e.,have no actual code). public void stop { } // Print a message on the screen (x=20, y=10). public void paint(Graphics g) { g.drawString("Hello, world!", 20,10); // Draws a circle on the screen (x=40, y=30). g.drawArc(40,30,20,20,0,360); } }

Additional simple applets are available at Wikiversity.

For compiling, this code is saved on a plain-ASCII file with the same name as the class and .java extension, i.e. HelloWorld.java. The resulting HelloWorld.class applet should be placed on the web server and is invoked within an HTML page by using an or an