Problem in importing jar file in libraries of netbeans

[dataprofiling]

I am using Netbeans IDE 6.8 for creating my project.I want to import jfreechart jar file in to my project, for that i right click on the libraries and click on the 'Add Library' and added the jar file.Now my problem is that i want to use classes of that jar file.so how can i use that classes. I used import in my class file but it won't work. Please reply.

[Eranga]

First of all you have to import that jar package in your class file.

import jfreechart.*;