Buttons on the toolbar let you create a class, define an inheritance relationship, or compile a class. Open a project in BlueJ and you’re presented with a refreshingly sparse window: menu bar across the top, toolbar to the left of a large workbench area, and a smaller object bench pane below. I later learned that BlueJ had been installed on the Raspberry Pi since 2015. I first became aware of BlueJ (and Greenfoot) when I found them pre-installed on a Raspberry Pi 4 that I had gotten last year. Earlier, 32-bit versions exist, but they are no longer being developed. The current version of BlueJ (4.2.2 at the time of this writing) requires JDK 11 or later, and as such must be run on a 64-bit operating system. BlueJ also comes in a generic form: packaged as a JAR file so that BlueJ can be installed on any system that supports Java. When Java appeared, the tool was rebuilt using Java as the language and the name was changed to BlueJ.Įditions of BlueJ exist for Linux, MacOS, and Windows. At that time, it was both a development environment and a language. Learn Java with BlueJīlueJ first appeared in 1999, named simply Blue. Consequently, both provide an easy introduction not only to the Java language, but to the tools and techniques needed to build applications in that language.

In fact, as Neil Brown, the lead developer explains, BlueJ’s and Greenfoot’s features are “.revealed as users come to them.” You are not thrown into the deep end of the pool. The creators of BlueJ and Greenfoot selected the feature set and interface design to not overwhelm beginners. They are the product of a team based at King’s College in London (though team members have, at times, been affiliated with universities in Australia and Denmark). Your chosen development tool is as impenetrable as the language it’s supposed to help you with.Įnter BlueJ and Greenfoot, two IDEs very specifically designed for beginners. You choose one, download and install it, and in a very short time you realize that you now have two things to learn: Java and the IDE. Several popular, free Java IDEs are available: Eclipse, NetBeans, and the community edition of IntelliJ, for example.

A single application in which you can edit, build, run, debug, and deploy your soon-to-be-written Java application. Ok, first things first: You need one of those integrated development environments (IDEs) you’ve read about. But, you take a deep breath and resolve to give it a go. It might even seem impenetrable if you’re a new programmer.

Adding sound greenfoot