March 1999
Intermediate to advanced
600 pages
16h 25m
English
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JAR Files
Java 1.1 added support for Java ARchive
files, JAR files for short. JAR files bundle the many different
classes, images, and sound files an applet requires into a single
file. It is generally faster for a web browser to download one JAR
file than to download the individual files the archive contains,
since only one HTTP connection is required. An applet stored in a JAR
file, instead of as merely loose .class files,
is embedded in a web page with an <applet>
tag with an archive attribute pointing to the JAR
file. For example:
<applet code=NavigationMenu archive="NavigationMenu.jar" width=400 height=80> </applet>
The code attribute still says that the main class
of this applet is called NavigationMenu. However,
a Java 1.1 web browser, rather than asking the web server for the
file NavigationMenu.class as a Java 1.0 web
browser would, asks the web server for the file
NavigationMenu.jar. Then the browser looks
inside NavigationMenu.jar to find the file
NavigationMenu.class. Only if it doesn’t
find NavigationMenu.class inside
NavigationMenu.jar does it then go back to the
web server and ask for NavigationMenu.class. Now
suppose the NavigationMenu applet tries to load an
image called menu.gif. The applet will look for
this file inside the JAR archive too. It only has to make a new
connection to the web server if it can’t find
menu.gif in the archive.
Sun wisely decided not to attempt to define a new file format for JAR files. Instead, they stuck with the tried-and-true zip format. ...
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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.