How to make .jar file for a multiple class program

I have a code for a chat room that contains two folders , one for Server and one for Client
What I need is to create a jar file for the server and a jar file for the clients
but here the first problem , I have a file that named (SocketMessengerConstants.class) that is located outside the two folders and is being read by the two projects .
I mean the server uses it while running and the client uses it too .
the second problem is : I don't know how to create a jar file at all !
please tell me how to do it in detail
Thank you

ChuckBing wrote:[Packaging Programs in JAR Files|http://java.sun.com/docs/books/tutorial/deployment/jar/index.html]
I tried to read this tutorials before I come here but I couldn't understand it
can you please tell me a specific steps to follow instead of the explaining .. because I understand the explanation but I can't apply it

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>
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How to make .jar file for a multiple class program

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