How can a user create a jar file?

The format of the command for creating a JAR file is:    jar cf jar-file input-file (s)

The options and arguments used in this command are:

•   The c option indicates to create a JAR file.

•   The f option indicates that it wants the output to go to a file rather than to stdout.

• jar-file  is the name that you want the resulting JAR file to have. You can
use any filename for a JAR file. By convention, JAR filenames are given a . jar extension, though this is not required.

•   The input - file ( s) argument is a space-separated list of one or more files
that you want to include in your JAR file. The input - file ( s ) argument can
contain the wildcard * symbol. If any of the "input-files" are directories, the contents of those directories are added to the JAR archive recursively.
This command will generate a compressed JAR file and place it in the current directory.
The command will also generate a default manifest file for the JAR archive.