set classpath in runtime, is it possible?

hi experts,

my program has a function that allow user set their library at runtime of application, i know we can set classpath in bat file but i want set classpath at runtime and my application will set classpath in java code, is it possible? if yes, how can i do that job, please give me an url or example code to do that, thanks  
khacduystAsked:
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SirCroftyCommented:
Possibly you are looking for something like this:

http://forum.java.sun.com/thread.jspa?forumID=32&threadID=300557
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khacduystAuthor Commented:
cool resource, thanks
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