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Animal
Cat Tiger Dog
All the animals in the animal class have similar behaviours such as eating, drinking, and they also
have similar properties, such as colour, size, and number of legs.
In the same way, a class in Java contains different types of objects that have similar properties
and behaviour. After declaring a class, we can create many number of objects from it.
i + INTRODUCING BLUEJ
Previously, we used simple text editors such as Notepad to develop Java programs. With the
advancement in technology, there are different types of Integrated Development Environment
(IDE) available free of cost. Some of the IDEs are Netbeans, Eclipse, and BlueJ. In this chapter, we
are using BlueJ.
BlueJ is an IDE designed for beginners. It has a built-in editor,
debugger, and viewer. An editor gives us an area where we can
write programs, and a debugger allows us to find errors in the
programs. On the other hand, the viewer shows the output of
the program.
BlueJ is a freely downloadable application. We can download it
from https://www.bluej.org/. After downloading the application,
we need to install it on our computer.
i + INTERFACE OF BLUEJ
After installing the BlueJ IDE, double click on the BlueJ application icon. The BlueJ application
window appears.
Menu Bar
New Class
Button
Compile
Button
Project Icon
Object Bench
51
Program Coding

