Learning Object-Oriented Programming

Recognizing attributes/fields

We already know the information required for each of the shapes. Now, it is time to design the classes to include the necessary attributes that provide the required data to each instance. In other words, we have to make sure that each class has the necessary variables that encapsulate all the data required by the objects to perform all the tasks.

Let's start with the Square class. It is necessary to know the length of side for each instance of this class, that is, for each square object. Thus, we need an encapsulated variable that allows each instance of this class to specify the value of the length of side.

Tip

The variables defined in a class to encapsulate data for each instance of the class are known as attributes ...