How do I make a JAR from a .java file?

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Open a command prompt.

Go to the directory where you have your .java files

Create a directory build

Run java compilation from the command line

javac -d ./build *.java

if there are no errors, in the build directory you should have your class tree

move to the build directory and do a 

jar cvf YourJar.jar *

For adding manifest check jar command line switches

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