How to Update Jar Files

Can u tell me how to update an JAR file .
I have a jar file ,I would like to add a class in that jar.
I am able to add it but it goes
into the root folder where as i want it go in one of the sub folder.
Eg
TEST.JAR
The structure is
Server\a.class
Server\folder1\b.class
Server\folder2\c.class
Now when i add the class it goes to
Server\a.class
Server\folder1\b.class
Server\folder2\c.class
my.class
where as i want it to go in
Server\folder1\my.class

Show the code you use to add it to the JAR, and we will attempt to fix it. Don't forget to put it around [code]  tags

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