e:
cd E:\com\mindprod\mypackage
javac *.java

rem jar {ctxu}[vfm0M] [jar-file] [manifest-file] [-C dir] files ...
rem -c create new archive
rem -v generate verbose output on standard output
rem -f specify archive file name
rem -m include manifest information from specified manifest file
cd \
jar.exe -cvfm com\mindprod\mypackage\helloworld.jar com\mindprod\mypackage\main.mft com\mindprod\mypackage\*.class