Read Other Jars

I understand how to read classes of other jars by importing them. But how would a jar access files from another jar that is inside of it? Like I have a jar that just holds directories and text file which is inside of the main jar, so how do I read those files?
[267 byte] By [blackmagea] at [2007-11-27 8:48:32]
# 1
JarInputStream
cotton.ma at 2007-7-12 20:55:47 > top of Java-index,Java Essentials,Java Programming...
# 2
Is there any example code of how to use this?
blackmagea at 2007-7-12 20:55:47 > top of Java-index,Java Essentials,Java Programming...
# 3
And better yet, since I'm using mutilple jars inside on jar, is there anyway those other jars can be modified?
blackmagea at 2007-7-12 20:55:47 > top of Java-index,Java Essentials,Java Programming...