System call fom Java code

Hi all
I hope someone over here might answer my problem.
I need to run a Shell script form my Java code, which does perform some operations like writing/copying files to a specific directory and my Java code then starts reading the files and do necessary stuff like parsing it for some info inside the file.
If I make a system call from my Java code, how do I know when the shell script is done executing completely? Just to make sure that my Java code execution starts only after the shell script has executed.
If anyone has come across such a scenario, please reply to this topic. A sample code wud be a bonus for me :)
Thanks
-Uday

If you've never used Runtime.exec, read this carefully first:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
MOD

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