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BlueJ Logo.png
BlueJ screenshot.png
Screenshot of BlueJ
Original author(s) Michael Kölling & John Rosenberg
Developer(s) BlueJ Team
Stable release 3.1.5 / March 29, 2015 (2015-03-29)[1]
Development status Active
Written in Java
Operating system Cross-platform
Platform Java
Available in Multilingual
Type Integrated development environment
License GNU General Public License

BlueJ is an integrated development environment (IDE) for the Java programming language, developed mainly for educational purposes, but also suitable for small-scale software development. It runs with the help of JDK(Java Development Kit)

BlueJ was developed to support the learning and teaching of object-oriented programming, and its design differs from other development environments as a result.[2] The main screen graphically shows the class structure of an application under development (in a UML-like diagram), and objects can be interactively created and tested. This interaction facility, combined with a clean, simple user interface, allows easy experimentation with objects under development. Object-oriented concepts (classes, objects, communication through method calls) are represented visually and in its interaction design in the interface.[3]


The development of BlueJ was started in 1999 by Michael Kölling and John Rosenberg at Monash University, as a successor to the Blue system. BlueJ is an IDE. Blue was an integrated system with its own programming language and environment. BlueJ implements the Blue environment design for the Java programming language.

BlueJ is currently being maintained by a joint team at the University of Kent, Canterbury, England – where Kölling now lectures, and La Trobe University in Melbourne, Australia.

In March 2009, the BlueJ project became free and open source software, and licensed under GNU GPL with the classpath exception.

The latest version of BlueJ is 3.1.5 released on 29 March 2015.

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