oop c1

• Object


  A person, place or thing (a noun)
• Method


  An action performed by an object (a verb)
• Attribute


  Description of objects in a class
• Class


  A category of similar objects (such as automobiles), does not hold any values of the object's attributes
• Object

  • Has state - descriptive characteristics
  • Has behaviors - what it can do (or what can be done to it)
• State


  The descriptive characteristics of an object
• Behavior


  What an object can do or what can be done to it
• Class


  The blueprint of an object, uses methods to define the behaviors of the object, represents a concept
• Object


  The embodiment of a concept represented by a class, an instance of a class
• Characteristics/concepts of OOP


  • Abstraction
  • Encapsulation
  • Inheritance
  • Polymorphism
• Abstraction


  Designing classes by focusing only on the important facts about the problem at hand
• Encapsulation


  All data members (fields) of a class are declared private, some methods may be private too
• Inheritance


  Ability to create new classes from existing classes
• Polymorphism


  One single statement is used as a call to various methods, the exact method to be called is only known during runtime
• Object-oriented programming languages can be pure OO (Smalltalk, Eiffel, Actor, Java) or hybrid OO (C++, Objective-C, Object-Pascal)
• Review: Introduction to Object Orientation

  • What are the four basic principles of object orientation? Provide a brief description of each.
  • What is an Object and what is a Class? What is the difference between them?
  • What is an Attribute?
  • What is an Operation?
  • What is inheritance?
  • What is polymorphism?
  • Describe the strengths of object orientation.