Jar file is used to archive most files in one file. It is commonly used for distributing Java classes and metadata. Jar file make use of a type of.zip file format to make archive file. To make or extract a jar file, user should have Java JDK. JDK is available to download and use free from Sun Microsystems.

• Run command prompt in Windows or Terminal window in Linux and Mac OSX depending on your Operating System.

• Enter "cd jar_directory" to move to directory where.jar file is kept. Modify "jar_directory" to reflect path to the jar file.

• Enter "jar xf file.jar" to take out contents of.jar file.

• Enter "exit" to close command prompt or terminal window.