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JFreeChart is Java chart library that makes it easy for developers to display professional quality charts in their applications. JFreeChart's extensive feature set includes:

• a consistent and well-documented API, supporting a wide range of chart types
• a flexible design that is easy to extend, and targets both server-side and client-side applications support for many output types, including Swing components, image files (including PNG and JPEG), and vector graphics file formats (including PDF, EPS and SVG);
• JFreeChart is "open source" or, more specifically, free software.

It is distributed under the terms of the GNU Lesser General Public Licence (LGPL), which permits use in proprietary applications.

Model–view–controller (MVC) is a software architecture pattern which separates the representation of information from the user's interaction with it. The model consists of application data, business rules, logic, and functions. A view can be any output representation of data, such as a chart or a diagram. Multiple views of the same data are possible, such as a bar chart for management and a tabular view for accountants. The controller mediates input, converting it to commands for the model or view. The central ideas behind MVC are code reusability and separation of concerns.