1. compile all your .java files
2. identify which class holds your main() eg. XYZ.class
3. create a manifest file (eg. named manifest with no extensions) with a line
specifying this class that holds main. Put a carriage return at the end
manifest
--------
Main-Class: XYZ
4. create the jar file run.jar specifying the manifest file and the class files to
add to the jar
> java -jar cmf manifest run.jar *.class
5. to run
> java -jar run.jar