Session 9

Session 9

Saturday, 2 desember 2017

Today is my group's turn to present today's topic "Object Oriented Programming" but because Miss Yanfi made a mistake and list us to present session 7's topic "Abstract Data Type" so Miss Yanfi gave us option to choose between session 7 "Abstract Data Type" or session 8 "Object Oriented Programming". My group chose to present session 7 "Abstract Data Type". Today we discuss about The Concept of Abstraction, Introduction to Data Abstraction, Language Examples, Parameterized Abstract Data Types, Encapsulation Constructs, and Naming Encapsulations. After we explain the topics, there were some questions. We were a little confused about the answers for the questions and ask some of it to Miss Yanfi. On this session there's also mind map that Miss Yanfi made for us.

This session talks about the introduction, Object-Oriented Programming, Design Issues for Object-Oriented Languages, Support for Object-Oriented Programming in C++, and The Implementation of Object-Oriented Constructs.

3 major language features :

• Abstract data type.
• Inheritance.
• Polymorphism.

Inheritance allows new classes defined in terms of existing ones, i.e., by allowing them to inherit common parts. Inheritance addresses both of the above concerns--reuse ADTs after minor changes and define classes in a hierarchy.

Three ways a class can differ from its parent:
1. The parent class can define some of its variables or methods to have private access, which means they will not be visible in the subclass.
2. The subclass can add variables and/or methods to those inherited from the parent.
3. The subclass can modify the behavior of one or more of its inherited methods.

A polymorphic variable can be defined in a class that is able to reference (or point to) objects of the class and objects of any of its descendants.

Design Issues for OOP Language :

•The Exclusivity of Objects.
•Are Subclasses Subtypes?
•Single and Multiple Inheritance.
•Object Allocation and Deallocation.
•Dynamic and Static Binding.
•Nested Classes.
•Initialization of Objects.

That's all for this session.