9.1 Introduction
The idea of defining objects is quite natural to humans since we deal with objects in our day-to-day life. We understand an object as something that has
- a set of attributes and
- a related set of behaviors.
Early on, babies learn about objects in their environment. For example, as babies, we learn that a ball (object) has a color, shape, and size (attributes), and it rolls, skids, and bounces (behavior). In the early 1970s, Alan Kay at Xerox PARC (Palo Alto Research Center) worked on the concept of object-oriented programming (OOP)
[1]. While working ...
