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BlueJ Java Download: What's New in Version 5.1.0 and How to Get It


How to Download and Use BlueJ for Java Programming




If you are looking for a simple and interactive way to learn and teach Java programming, you might want to try BlueJ. BlueJ is a free integrated development environment (IDE) that allows you to create, compile, execute, and debug Java programs in an easy and intuitive way. In this article, we will show you how to download and install BlueJ on different platforms, how to create and run a Java project in BlueJ, and how to compare BlueJ with other popular Java IDEs.


What is BlueJ and why use it?




BlueJ is a simple and interactive IDE for Java




BlueJ was developed by the BlueJ team at Deakin University, Australia, and the University of Kent, UK, as a teaching tool for introductory Java courses. It is based on an earlier IDE called Blue, which was designed by Michael Kölling, one of the creators of BlueJ. BlueJ has a deliberately smaller and simpler interface than professional IDEs like Eclipse or NetBeans, which makes it easier for beginners to get started with Java programming. It also allows you to interact with objects directly, without having to write a main method or a test class. You can create objects, invoke methods, pass parameters, inspect values, and more, just by using the mouse. You can also execute Java expressions without compiling them, just by typing them in the code pad. This way, you can explore and experiment with Java concepts in a graphical and interactive way.




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BlueJ has features that support learning and teaching Java




BlueJ is not only a simple IDE, but also a pedagogical one. It has several features that are designed to help students learn and understand Java better, as well as to help teachers teach Java more effectively. Some of these features are:


  • The editor has syntax highlighting, auto-completion, auto-indentation, code formatting, error checking, scope coloring, line numbering, bookmarks, etc.



  • The debugger allows you to set breakpoints, step through code, watch variables, evaluate expressions, etc.



  • The object bench shows you the objects that you have created and their state. You can drag and drop objects from the bench to the code pad or the editor.



  • The class diagram shows you the classes that you have defined and their relationships. You can create new classes, edit existing ones, or delete them from the diagram.



  • The documentation generator creates HTML documentation for your classes based on Javadoc comments.



  • The teamwork support allows you to collaborate with other students or teachers using Git or SVN repositories.



  • The extensions add more functionality to BlueJ, such as testing tools, code analysis tools, GUI builders, etc.



How to download and install BlueJ on different platforms




Download BlueJ from the official website




To download BlueJ, you need to visit the official website at [1]( There you will find the latest version of BlueJ for different platforms. The current version is 5.1.0a (as of October 2022), which supports Java 17. You will also find previous versions of BlueJ if you need them.


Install BlueJ according to your operating system




To install BlueJ, you need to follow the instructions for your operating system. Here are the steps for the most common platforms:


Windows




  • Run the installer that you downloaded from the website.



  • Follow the wizard to choose the installation directory and the components to install.



  • If you don't have Java installed, the installer will download and install it for you.



  • Click Finish to complete the installation.



  • You can launch BlueJ from the Start menu or the desktop shortcut.



Mac OS X




  • Open the disk image that you downloaded from the website.



  • Drag and drop the BlueJ icon to the Applications folder.



  • If you don't have Java installed, you will be prompted to install it from the Apple website.



  • You can launch BlueJ from the Applications folder or the Dock.



Linux




  • Extract the archive that you downloaded from the website to a directory of your choice.



  • If you don't have Java installed, you need to install it from your package manager or from the Oracle website.



  • You can launch BlueJ by running the bluej script in the bin directory.



Other systems




If you are using a different platform, such as Solaris, BSD, or Raspberry Pi, you can find more information on how to download and install BlueJ on the [2]( page of the official website.


How to create and run a Java project in BlueJ




Create a new project and a new class




To create a new Java project in BlueJ, you need to do the following:


  • Click on the Project menu and select New Project...



  • Choose a name and a location for your project and click Create.



  • A new window will open with an empty class diagram.



  • To create a new class, click on the New Class button on the toolbar or right-click on an empty space and select New Class...



  • Type a name for your class and choose a type (class, interface, enum, or abstract class) and click OK.



  • A new class icon will appear on the diagram. You can drag and drop it to change its position.



Write and compile Java code in the editor




To write and compile Java code in BlueJ, you need to do the following:


  • Double-click on a class icon to open its editor window.



  • Type or paste your Java code in the editor. You can use the toolbar buttons or keyboard shortcuts to perform actions such as undo, redo, cut, copy, paste, find, replace, etc.



  • To compile your code, click on the Compile button on the toolbar or press Ctrl+K. If there are any errors or warnings, they will be shown in the status bar at the bottom of the window. You can click on them to jump to the corresponding line of code.



  • To save your code, click on the Save button on the toolbar or press Ctrl+S. You can also save all your classes at once by clicking on the Project menu and selecting Save Project.



Execute and debug Java code using the object bench and the code pad




To execute and debug Java code in BlueJ, you need to use two tools: the object bench and the code pad. The object bench is a panel at the bottom of the project window that shows you the objects that you have created and their state. The code pad is a panel at the right of the project window that allows you to type and execute Java expressions without compiling them. Here is how you can use them:



  • To create an object of a class, right-click on its icon and select New [classname]... A dialog box will appear where you can enter values for its constructor parameters. Click OK to create the object. A new object icon will appear on the object bench. You can rename it by right-clicking on it and selecting Rename...



  • To invoke a method on an object, right-click on its icon and select Call Method... A dialog box will appear where you can choose a method from a list and enter values for its arguments. Click OK to invoke the method. The return value (if any) will be shown in a pop-up window. You can also drag and drop an object from the bench to another object or to itself to invoke a method that takes an object as a parameter.




  • To debug your code, you can use the debugger tool on the toolbar or press Ctrl+D. This will open a new window where you can see the source code, the call stack, and the local variables of your program. You can set breakpoints, step through code, watch variables, evaluate expressions, etc. using the buttons or menus on the debugger window.



How to compare BlueJ with other Java IDEs




BlueJ is not the only IDE for Java programming. There are many other IDEs that offer different features and advantages for different purposes and levels of expertise. Here are some of the most popular Java IDEs and how they compare with BlueJ:


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