June 2001
Intermediate to advanced
888 pages
21h 1m
English
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Running an Applet with a JDK
Problem
You want to use an applet on an intranet or the Internet, but it needs a modern JDK to run.
Solution
Use the Java Plug-in.
Discussion
Sun’s Java Plug-in allows your applet to run with a modern JDK even if the user has an ancient browser (Netscape 2, 3, or 4), or an anti-standard-Java browser (Microsoft Explorer might come to mind). For Netscape, the plug-in runs as a Netscape Plug-in. For Microsoft, the plugin runs as an ActiveX control. The Java Plug-in was previously a separate download, but is included in the Java Runtime Environment (JRE) in all modern JDK versions.
The HTML code needed to make a single applet runnable in either of those two modes rather boggles the mind. However, there is a convenient tool (which Sun provides for free) that converts a plain applet tag into a hairy mess of HTML that is “bilingual”: both of the major browsers will interpret it correctly and do the right thing. Note that since browser plug-ins are platform-dependent, the Plug-in is platform-dependent. Sun provides versions for Solaris and MS-Windows; other vendors provide it ported to various platforms. Learn more at Java’s Plug-in page, http://java.sun.com/products/plugin/.
To try it out, I started with a simple JApplet
subclass, the
HelloApplet
program from Section 25.9. Since this is a JApplet,
it requires
Swing support, which is not available in older Netscape versions or newer MSIE versions. Here are some screenshots, and the “before and after” versions ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.