How to call function in jar file?

First, I can't write english well.(I'm korean.. ) sorry about that.
I have known function in jar file.
but I don't know how to call function in jar file.
how can I this work?
My project and another project are respectively developing D-project with me and other man.
so i need it. or I can't do this work.
I will paste other's source code in my source code.
and then recomplie , build it.. but it is not my wish!
thanks for reading my sentence.

If you have a jar file with a class that you wish to use, then you must add the jar file to your class path ($CLASSPATH on unix, linux, etc. and %CLASSPATH% on Windows).
Then you can use the class normally, just as you would if it were not in the jar.
If you meant something else, you'll need to explain what you meant.

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