September 2001
Intermediate to advanced
640 pages
31h 42m
English
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Java Applets
Java is an object-oriented programming language developed by Sun Microsystems (http://www.sun.com). It should be noted that it is not related to JavaScript, which is a scripting language developed by Netscape Navigator to run within an HTML document in a browser. Because Java is a full programming language (like C or C++), it can be used to create whole applications.
Java’s primary contribution to the Web, however, has been in
the form of Java applets, which are
self-contained, mini-executable programs. These programs, named with
the .class suffix, can be placed right on the
web page, like a graphic.
Advantages and Disadvantages
Applets are ideal for web distribution for the following reasons:
They are platform-independent.
They download completely and run on the client, so there is no continued burden on the server.
Applet files are generally quite compact and download quickly.
They don’t require a proprietary plug-in to be installed. All the major browsers are now Java-enabled, which means chances are good that users will be able to view the applet.
Of course, every utopian technology has its darker side, and unfortunately, in the real world, browsers can be temperamental in the way they handle Java applets. Browsers are notorious for crashing in the presence of a computation-hungry applet. In general, it also takes browsers a long time to initialize Java, which tends to chase users away. There was a great buzz among web developers when Java applets first hit the ...
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