$ sudo apt-get update
$ sudo apt-get install libjfreechart-java 

libjfreechart-java is installed in your system.

Make ensure the libjfreechart-java package were installed using the commands given below,

$ sudo dpkg-query -l | grep libjfreechart-java *

You will get with libjfreechart-java package name, version, architecture and description in a table

libjfreechart-java package basic information: