How to extract wav file in specific time?

I can now play and record the wav file using java. However how can I edit the wav file and extract a specifc time period of the wav file? Which library or method should I use?
Thanks

Well, I'm not going to give you your code on a silver platter. You'll need to put some effort in it yourself.
So look at that available() method yourself an see if you can improve on that. Look at the api docs, there is loads of information there, and often it will give you pointers on why things are not working.

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