In particular, Netscape won't work with the MPG applet in problem 2.11. If your MPG applet works in Visual Cafe, but then you can get an error in Netscape after transferring the HTML and class files to a Web server, you've probably stumbled across this problem. If you've got the applet working in Visual Cafe, and you've moved the needed files to the Web server, don't worry. The problem is that there are really two versions of Java floating around. One of the big changes between JDK 1.0 and 1.1 is in the event handling model.
Event handling is programming-speak for how computers find out what's going on in the world.
Since the other applets in the assignment don't use event handling, they work okay in Netscape. The class documentation is a great source of information on Java. You'll find detailed information on all the classes and packages that are part of the Java language. Start with the Java Documentation . If you already happen to know that the Graphics class is part of the AWT package, you can click on package java.awt .