You can work with existing BlueJ projects in the following two ways in the NetBeans IDE with BlueJ Module:
The advantage of this approach is that you can continue working much as you have in BlueJ, but with the benefit of features in the NetBeans IDE editor.
The advantage of this approach is that the NetBeans IDE project system is more suitable for large projects. For example, you have more features in the IDE for managing the classpath (such as for adding JAR files or the output of another project to your classpath) and managing the way the application is built and packaged. In addition, sources, unit tests, and classes are placed in different folder.
To import an existing BlueJ project into NetBeans IDE:
The project opens up in the IDE. You can view the project in either the BlueJ View window or the IDE's standard Projects window.
To convert a BlueJ project into a NetBeans IDE project:
When you convert a BlueJ project into a standard Java SE project, the IDE copies the sources from your existing project and places them into a new project, where sources and compiled classes are separated into different folders. Your BlueJ project remains, but is separate from the newly created project. The converted project is not visible in the BlueJ view and can not be opened in BlueJ.
In the converted project, you can easily manage the classpath through the Libraries node. You can manage the way the application is built and packaged through the Project Properties dialog box, which you can open by right-clicking the project's node and choosing Properties.