You could use JFreeChart:

www.object-refinery.com/jfreechart/index.html

JFreeChart is free software under the terms of the GNU LGPL.

If it is for schooling, then you will have to learn a
long hardway of java. But if it is for work, any
third party would do such as sitraka, infragistics,
jinfonet, etc... If your company not nippicking use
JReport??? from the same house created JCreator IDE.

Correction. JReport was not came from the same house
with JCreator. I did not see the creator e-mail
responded to you earlier.

and now I will try JFreeChart that David Gilbert recommended to me :)
JReport ??? it's for creating report ... that's right ?