Creating a jar file, adding to, extracting and viewing the contents of...

To view the contents of a jar file:

jar tf jar-file.jar

To run a jar file:

java -jar jar-file.jar

To create a jar file and add files and directories to it:

jar cf jar-file.jar lib Launcher.jar Autoexec.jar

To update an existing jar file and add files and directories to it:

jar uf jar-file.jar new-app.jar

To extract files from a jar file:

jar xf jar-file.jar