A free Java Development Environment designed for beginners

BlueJ for Mac

BlueJ for Mac

  -  173 MB  -  Open Source
BlueJ for Mac is a development environment that allows you to develop Java programs quickly and easily. Its main features are that it is:
  • Simple - BlueJ has a deliberately smaller and simpler interface than professional environments like NetBeans or Eclipse. This allows beginners to get started more quickly, and without being overwhelmed.
  • Designed for teaching - BlueJ is deliberately designed with good pedagogy in mind. There is a popular textbook designed for teaching introductory university/college courses with BlueJ, and a site full of teaching resources.
  • Interactive BlueJ - allows you to interact with objects. You can inspect their value, call methods on them, pass them as parameters and more. You can also directly invoke Java expressions without compiling. Thus BlueJ for macOS is a powerful graphical shell/REPL for Java.
  • Portable BlueJ - runs on Windows, macOS, Linux and other platforms which run Java. It can also run without installation from a USB stick.
  • Mature BlueJ - is over fifteen years old, but continues to be updated and supported by a full-time team. "We aim to respond to all technical support requests within one working day."
  • Innovative BlueJ - has several features not seen before in other IDEs. Its object bench, code pad, and scope coloring were all original BlueJ features.
BlueJ's editor features unique scope highlighting, where the background of each code block is colored to allow you to visually scan the code much faster. It also helps in spotting misplaced curly brackets. Objects can be inspected while the program is running. The contents of fields are displayed to aid understanding and debugging. As well as allowing inspection of objects while the program is running, objects can be dynamically created, and their methods can be invoked. You can also invoke Java code directly, without compilation, just by typing it in. The result is printed out, and can then be inspected, manipulated, or passed as a parameter to another method call.

Note: Requires Java for Mac and 64-bit processor.

Also Available: Download BlueJ for Windows

  • BlueJ 5.3.0 Screenshots

    The images below have been resized. Click on them to view the screenshots in full size.

    BlueJ 5.3.0 Screenshot 1
  • BlueJ 5.3.0 Screenshot 2
  • BlueJ 5.3.0 Screenshot 3

What's new in this version:

- Stopped Terminal showing blank stderr pane when you run a JavaFX application
- Added JavaFX doc link to help menu
- Fixed issue with same-day commits sometimes being sorted wrong in Git history due to sorting by 12-hour clock time
- Fixed Git history to only show files changed in that commit (rather than all files present in the repository then)
- Some slight speed-ups to Java editor performance
- Added code completion for local variable names (incl parameters, for-each loops and instanceof vars)
- Added section boundaries in the terminals, to group together output from each method callm and added tooltip showing the method call that produced each section (even if you aren't logging method calls)
- Clear the stderr pane in Terminal on each method call
- Updated the Git library we use
- Changed backspace behaviour after if/else in Stride to only remove the else, not the whole if
- Fixed a bug where Stride didn't save when you added/removed a default clause in a switch frame
- Fixed a bug which could prevent compiler errors being shown when a stale class file was present
- Fixed a bug where BlueJ would endlessly compile blank files
- Changed debugger split pane to be 3-way
- Stopped object highlight enlarging as you step through code
- Added user-contributed Chinese translations