Summary

We have reached the end of the first chapter. Let us summarize some of what we have learned.

Object-oriented programming is not simply features added to a programming language. Rather, it is a new way of thinking
Object-oriented programming views a program as a community of agents, termed objects. Each object is responsible for a specific task.
An object is an encapsulation of state (data values) and behavior (operations).
The behavior of objects is dictated by the object class.
An object will exhibit its behavior by invoking a method in response to a message.
A method differs from a procedure in having a receiver, and in that the interpretation of the method differs for different receivers.
Objects and classes extend the concept of abstract data types by adding the notion of inheritance.