How to make jays killer cake


A free Java Development Environment designed for beginners, used by millions worldwide. Find out more ...

"One of my favorite IDEs out there is BlueJ"
- James Gosling, creator of Java.

    Created by
    Supported by

    Download and Install

    Version 5.0.1, released April 30, 2021 (text file support, bug fixes, and more)

    Grade: BlueJ now uses Java 11+, which requires a 64-bit operating system, which 95 +% of users will have.
    For 32-bit operating systems, download BlueJ 4.1.4 instead.

    Useful Resources


    "Objects First with Java: A Practical Introduction Using BlueJ" is a textbook co-written by the developers of BlueJ and has sold hundreds of thousands of copies worldwide.

    Teacher support

    Our free Blueroom website offers teaching resources and the chance to engage with other educators using BlueJ around the world.


    Tutorials and reference materials for working in BlueJ.


    We have several extensions available that add to BlueJ's base functionality.