Need Help: Adding a day in a variable using Jasper Reports

I'm a newbie in java programming and I would like to ask solutions to my development problem.

I would to ask if I could possibly add one day to a date variable or date field in Jasper Report?
and my date format is 'yyyy-MM-d'.
ex.
2009-11-6 + 1 day = 2009-11-7


Thank you.

How would you do it in Java?
Jasper reports supports some Java syntax so if you get it right in Java you're almost there.