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Example: As a family car, it’s equipped with extra seats and space for luggage, making it
suitable for personal trips. When used as a taxi, it features a fare meter and a taxi sign for
transporting passengers. As a pool car for students, it includes extra safety seats and a schedule
to manage shared transportation. Despite these different uses, the car remains fundamentally
the same, demonstrating how one object can fulfil multiple roles.
INTRODUCING BLUEJ
Earlier, we used basic text editors like Notepad to write Java programs.
However, with technological advancements, there are now several free
Integrated Development Environments (IDEs) available, such as NetBeans,
Eclipse, and BlueJ.
BlueJ is an IDE specifically designed for beginners. It provides a simple
and intuitive interface for learning object-oriented programming concepts. It includes a built-
in editor for writing code, a debugger to help find and fix errors, and a viewer to display your
program’s output. BlueJ also has a user-friendly interface that makes it easier to manage and run
Java programs.
You can download BlueJ for free from https://www.bluej.org/. After downloading, follow the
installation instructions to set it up on your computer. BlueJ’s simplicity and integrated tools
make it an excellent choice for learning and developing Java programs.
INTERFACE OF BLUEJ
After installing the BlueJ IDE, double-click on the BlueJ application shortcut icon on the Desktop.
The BlueJ application window appears.
Menu Bar
Title Bar
New Class
Button
Compile
Button
Project Icon
Object Bench
Program Coding 51

