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Password protect existing zip file in java

 
cle tan
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I have an existing zip file and I want to run a java application, after which, it's password protected.
People opening the zip file would have to enter the correct password to unzip the file.

Currently using zip4j http://www.lingala.net/zip4j/
but i noticed it does not have a method to password protect an existing zip file.
 
Ulf Dittmer
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There is no standard method to password-protect a zip file. Each archigin utility that offers it would implement its own way. The most common one is probably WinZip's method, but even that is not universal. So - you're largely out on your own for this.
 
cle tan
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wonder anyone has faced and solved this problem before?

doesn't look like winzip has its own java library to password protect an existing zip file.
 
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