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The JavaTM Archive (JAR) file format enables you to bundle multiple files into a single archive file. Typically a JAR file will contain the class files and auxiliary resources associated with applets and applications.
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Note: The JAR file format was introduced in version 1.1 of the Java Development Kit, and version 1.2 includes several enhancements to JAR file functionality. Unless otherwise noted, features covered in this trail pertain to both versions 1.1 and 1.2. If a feature description or example pertains only to one version, you'll be alerted with an annotation such as "version 1.2."
The JAR file format provides many benefits:
Java 3D TM
JavaMail
This trail has three lessons:
Using JAR Files: The Basics
shows you how to perform basic JAR-file operations, and how
to run software that is bundled in JAR files. This lesson also
introduces you to the concept of the JAR file's manifest, which
plays an important role in more advanced JAR functionality.
Signing and Authenticating JAR Files
shows you how to use the JDKTM tools to
digitally sign JAR files and verify the signatures of signed JAR files.
Using JAR-related APIs Introduced in 1.2 introduces
you to some of the new JAR-handling features in version 1.2 of
the Java platform.
The JAR file format is an important part of the
Java platform's extension mechanism. You can learn more about
that aspect of JAR
files in the
The Extension Mechanism
trail of this tutorial.
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