The unfortunate problem here is that java Zip is incompatible with regular Zip algorithms. You can only open Zip files that have been made by a java Zip file writer - not Winzip archives. Hopefully this will be corrected in a later version of the JDK
The Eagle sneers at the Peacock<p>Systems Administrator<br />OrderWare Solutions Ltd<br /><a href="http://www.orderware.net" target="_blank" rel="nofollow">http://www.orderware.net</a>
Which version of JDK are you using? In JDK 1.3 it is possible to open zip files which are created using Winzip or any other archiving tool. I am not sure about older versions but your program should work fine on JDK1.3.
Snigdha<br />Sun Certified Programmer for the Java™ 2 Platform