Explain jar archives, JAVA Programming

Explain JAR Archives ?

HTTP 1.0 uses a separate connection for every request. When you're downloading several small files, the time required to set up and tear down the connections can be a significant fraction of the total amount of time needed to load a page. It would be better if you could load all the HTML documents, images, applets, and sounds a page required in one connection.

One way to do this without changing the HTTP protocol is to pack all those various files into a single archive file, perhaps a zip archive, and just download that.

We aren't quite there yet. Browsers do not yet understand archive files, other than applets do. You can pack all the images, sounds, and .class files an applet needs into one JAR archive and load which instead of the individual files. Applet classes do not have to be loaded directly. They can also be stored in JAR archives. To do this you use the ARCHIVES attribute of the APPLET tag
< applet code="HelloWorldApplet"
width="200" height="100"
archives="HelloWorld.jar">
< hr>
Hello World!
< hr>
< /applet>

In this example, the applet class is still HelloWorldApplet. Therefore, there is no HelloWorldApplet.class file to be downloaded. Instead the class is stored inside the archive file HelloWorld.jar.
Sun provides a tool for creating JAR archives with its JDK. For example,
$ jar cf HelloWorld.jar *.class

This puts all the .class files in the current directory in the file named "HelloWorld.jar". The syntax of the jar command is deliberately same to the Unix tar command.

Posted Date: 5/16/2013 6:05:00 AM | Location : United States







Related Discussions:- Explain jar archives, Assignment Help, Ask Question on Explain jar archives, Get Answer, Expert's Help, Explain jar archives Discussions

Write discussion on Explain jar archives
Your posts are moderated
Related Questions
An object that having the data being transferred among JMS clients.

What are the different points where weaving can be applied? Ans) There are three points ? Compile Time ? Classload Time ? Runtime

Explain what is Local Variable ? Declaring variables (using the var keyword) inside a function forms them local. They are available only inside the function and hold no meaning


A preconfigured JMS object (a resource manager connection factory or a destination) formed by an administrator for the use of JMS clients and placed in a JNDI namespace


1. Create a text file (you can name it sales.txt) that contains in each line the daily sales of a company for a whole month. Then write a Java application that: a. asks the user fo

Execution Process of Java bytecode JVM are available for almost every operating system. Java bytecode is executed by employing any operating system's JVM. Hence achieve port

1. The purpose of this problem is to practice using ArrayLists.Write a Java client file containing a mainmethod plus other methods as needed to solve the following problem (no clas

List down the names of two array techniques available in JavaScript. The two techniques thata rae available in java script is: 1. sort( ) [sorts elements within alphabetical