Students can experiment with objects, try out what they do, gain experience with parameters and return values, and investigate a project or parts of a project.
The diagram conveys the message that an object-oriented program is represented by a set of cooperating classes, and that these parts of a program can be examined and understood separately. However, for beginners this is a fundamental problem—a much harder and more fundamental one than the question of where the semicolons go—and they get no help from the environment.An educational development environment must help learners develop the mental models needed, and it must put the important abstractions—classes, objects, and method calls—in front of the students’ eyes and let them think and talk about them.And this is exactly what BlueJ does. Macintosh: Note: BlueJ 3.0+ requires Java 6. (We will soon see how state is visualized. BlueJ is available for free! Once they have developed a good working model of object-oriented program execution, they are ready to leave BlueJ behind and switch to a professional environment. Most teachers have struggled with this. We will now discuss BlueJ’s interaction features in more depth—the first few here, and the rest in Part 2.The first, most obvious—and most fundamental—aspect of BlueJ’s functionality that is relevant here is its presentation of classes and objects.When opening BlueJ, the first thing shown to a user is a diagram of the classes in the project and their relationships. Java + BlueJ: Start learning the Java programming language today! Beginners need to Environments designed for professionals—NetBeans, Eclipse, and the like—work very well for experts. It was developed by the University of Kent and Deakin University to teach object orientation in a Java development environment. Interactivity and visualization help beginners learn and form mental models. The understanding developed through these activities will be very useful once students start writing code.Understanding object orientation is about understanding three big concepts that define objects: state, behavior, and identity. Understanding the difference is difficult.In BlueJ, the distinction is immediately clear: from a class, we can create objects. Presenting the classes in a diagram illustrates their relationship better than the simple list used in many other environments.Second, the difference between classes and objects is implicitly apparent. Beginners use only a small fraction of these tools, but they initially don’t know Choice, for people who don’t need it, is a bane, not a favor. The diagram’s arrows display inheritance and A user can then interactively create objects by right-clicking any of the classes and invoking a constructor from the class’ menu (see Once an object has been created, a menu offers all the object’s public methods, and any of them can be interactively invoked by selecting it from this menu (see Even the first few simple visualizations and interactions shown so far have a fundamental effect on the understanding of the principles of object orientation.First, the division of a program into classes is illustrated.
And this is hard.To do this effectively, it is crucial to have a well-developed mental model of object interactions—both how they work in general and how they are arranged in the particular program you are working on.And this is the crucial difference between beginners and experts: experts have a well-developed mental model of the fundamental principles of object orientation, while beginners do not. These are not well represented in professional environments. In fact, we can create as many objects as we like. But a programmer without a strong foundation in the fundamental principles is a dangerous thing.BlueJ is designed to offer just the right toolset for beginning programmers. To log in to BluJay Solutions, please choose your product as well as your region (North America, Europe, Australia or Africa). It is about designing algorithms and interacting object structures.
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