How can I edit a .zip or .jar file?

I want to create an application that can edit files stored in a zip file on the fly? How can I do this?
Thanks.

Look at these and use the search across the user forums
http://java.sun.com/j2se/1.4.2/docs/api/java/util/zip/package-summary.html
http://java.sun.com/j2se/1.4.2/docs/api/java/util/zip/ZipEntry.html
http://java.sun.com/developer/onlineTraining/new2java/supplements/2004/apr04.html
rykk

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