How to protect my files in a jar from extraction

I want to protect my jar files (using a password )from extraction.
When a user wants to extract, password must be asked alike password protection in a zip file.
Can i do it using java itself or i need a external tool.
Thanx

i am trying to find it out

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Thanks sabre150,
sabre150 wrote:
You cannot update a running jar file. I am sorry. I didn't know about it. Thanks to point out.
There are two ways I approach this depending on my exact requirements -
1) use the java.util.prefs.Preferences APII will try this one
>
2) if not already present I copy the preferences file from the jar to a known place. I use a directory in the user's home directory and normally make the directory name the program with a '.' prefix.
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Thanks sabre150,
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>
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How to protect my files in a jar from extraction

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