How do I change a folder to a jar?
Compress the contents of the folder then rename the .zip to .jar
From terminal use:
jar -cvf filename.jar ./foldername
jar works much the same as the unix archive command tar, the parameters cvf mean essentially Create Verbosely Filename which will just display the contents of foldername as they are added into filename.jar.
Instead of create you can use x for extract or t for test extract (aka list).