hai!

i created jar file that will be extractable in any way...

but what i need is don't to be extractable...

how do seal it from others seeing by extracting it...

any general idea please.....

I'm not aware of any lock option for JAR

ok..

is there any way make jar to more complicate like obfuscation ..

There is no need to. Noone wants to "steal your code", it's not worth it.

By definition, anyone with a genuine need to protect his code from theft has the knowledge to prevent such theft.
Anyone else doesn't produce code worth stealing.