A free Java Development Environment designed for beginners

BlueJ for Mac
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BlueJ for Mac

  -  171 MB  -  Open Source
Free Download

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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.

How to Use
  • Open the .dmg file and drag BlueJ to Applications
  • Launch BlueJ from the Applications folder
  • Configure preferences in the BlueJ settings
  • Create a new project to start coding
  • Write and compile Java classes
  • Run your program using the main method
  • Use the object bench for object testing
  • Save your work and export if needed
  • Check for updates regularly
System Requirements

macOS 10.13 (High Sierra) or later

At least 2 GB of RAM

200 MB of available disk space

Java Development Kit (JDK) 11 or higher

Intel or Apple Silicon processor

PROS
  • Easy to use for Java beginners
  • Built-in editor with syntax highlighting
  • Interactive object creation and testing
  • Simple interface with clear layout
  • Integrated debugger and terminal
CONS
  • Limited to Java programming only
  • Lacks support for advanced features
  • Outdated UI design compared to modern IDEs
  • Not ideal for large-scale projects
  • Fewer extensions and plugins available
Note: Requires Java for Mac and 64-bit processor.

Also Available: Download BlueJ for Windows

Download BlueJ for Mac Latest Version

  • BlueJ 5.4.1 Screenshots

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

    BlueJ 5.4.1 Screenshot 1
  • BlueJ 5.4.1 Screenshot 2
  • BlueJ 5.4.1 Screenshot 3

What's new in this version:

- Fixed a bug where errors would sometimes not show as red underlines in the editor. The side bar would indicate an error on the line but it was impossible to see the error message.
- Fixed a bug where the Windows MSI installer would allow multiple per-machine installations of different versions (in the same directory). BlueJ 5.4.1 will correctly remove all prior per-machine installations of earlier BlueJ versions.
- Fixed a missing message in the Stride editor.
- Fixed a bug where the right-click menu for the Java editor side bar (which let you turn on line numbers) would not appear on Windows.

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