A JAR (Java Archive) is a package file format typically used to aggregate many Java class files and associated metadata and resources (text, images, etc.) into one file to distribute application software or libraries on the Java platform.
In simple words, a JAR file is a file that contains compressed version of .class files, audio files, image files or directories. We can imagine a .jar files as a zipped file(.zip) that is created by using WinZip software. Even , WinZip software can be used to used to extract the contents of a .jar . So you can use them for tasks such as lossless data compression, archiving, decompression, and archive unpacking.

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Let us see how to create a .jar file and related commands which help us to work with .jar files

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1. Create a JAR file: To create a .jar file , we can use jar cf command in the following way:

   Here, cf represents create the file. For example , assuming our package pack is available in C:directory , to convert it into a jar file into the pack.jar , we can give the command as:

   Download hibernate 5.3. Features.

   
   

   Now , pack.jar file is created

2. Viewing a JAR file: To view the contents of .jar files, we can use the command as:

   Here , tf represents table view of file contents. For example, to view the contents of our pack.jar file , we can give the command:

   Now , the contents of pack.jar are displayed as:

   where class1 , class2 etc are the classes in the package pack. The first two entries represent that there is a manifest file created and added to pack.jar. The third entry represents the sub-directory with the name pack and the last two represent the files name in the directory pack.

   When we create .jar files , it automatically receives the default manifest file. There can be only one manifest file in an archive , and it always has the pathname.

   This manifest file is useful to specify the information about other files which are packaged.

3. Extracting a JAR file: To extract the files from a .jar file , we can use:

   Here, xf represents extract files from the jar files. For example , to extract the contents of our pack.jar file, we can write:

   This will create the following directories in C:

4. Updating a JAR File The Jar tool provides a ‘u’ option which you can use to update the contents of an existing JAR file by modifying its manifest or by adding files. The basic command for adding files has this format:

   here uf represent update jar file. For example , to update the contents of our pack.jar file, we can write:

5. Running a JAR file: In order to run an application packaged as a JAR file (requires the Main-class manifest header) , following command can be used:

Related Article:Working with JAR and Manifest files In Java

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