Study sheet: Foundations of Object-Oriented Programming

📋 Course Outline

1. Programming Paradigms and Procedural Programming
2. Limits of Procedural Programming
3. Object-Oriented Programming and Its Purpose
4. Classes, Objects, and Members
5. Core Principles of OOP
6. Binding and Message Passing
7. Benefits of Object-Oriented Programming

📖 1. Programming Paradigms and Procedural Programming

🔑 Key Concepts & Definitions

• Programming language : a language used to write instructions and tell a computer how to perform specific tasks
• Procedural programming : a programming approach in which a program is written as a sequence of steps or procedures to solve a problem and instructions execute from top to bottom

Real Example of Procedural Programming Language:

• The procedural sequence for making tea is:

  • boil water
  • add tea powder
  • add milk
  • add sugar
  • serve

📖 2. Limits of Procedural Programming

• The main limitations of procedural programming are:
  • poor code reusability
  • difficult error checking in large programs
  • dependent code
  • unsuitability for real-world applications
  • lack of data security
  • difficult maintenance of large programs

📖 3. Object-Oriented Programming and Its Purpose

🔑 Key Concepts & Definitions

• Object-oriented programming : an approach that designs software using classes and objects, combining data and the functions that operate on it into objects representing real-world entities

NeEDS OF OOP:

• The need for object-oriented programming includes: code reusability through inheritance, code security through access control, binding data to its functions, hiding unnecessary details through abstraction and encapsulation, managing complexity level by level, reducing code duplication

📖 4. Classes, Objects, and Members

🔑 Key Concepts & Definitions

• Class : a user-defined data type and blueprint that contains data members and member functions used to create objects
• Object : an identifiable instance of a class that represents a real-world entity through its state and behaviour
• Data member : a variable declared inside a class, such as a student's roll number, name, or marks
• Method : a block of code defined inside a class that performs a specific task or action

📖 5. Core Principles of OOP

🔑 Key Concepts & Definitions

• Encapsulation : the wrapping of data and the functions that operate on it into a single unit, with access controlled through the unit's methods
• Inheritance : the capability of a class to derive properties and characteristics from another class, promoting code reuse and reducing duplication
• Polymorphism : the ability of a message or operation to appear in more than one form and produce different behaviour in different situations

📖 6. Binding and Message Passing

🔑 Key Concepts & Definitions

• Binding : the process of associating a method call with the actual method or code that will be executed
• Message passing : an object-oriented mechanism in which one object sends a request to another object to invoke one of its methods and perform an operation

📖 7. Benefits of Object-Oriented Programming

🔑 Key Concepts & Definitions

• Code reusability : writing code once and using it multiple times, mainly through inheritance and reusable classes or methods
• Data redundancy : the condition in which the same piece of data is stored in two separate places; reusable common class definitions can reduce repeated functionality across classes

Difference :

Procedural vs Object-Oriented Programming

Dimension	Procedural programming	Object-oriented programming
Program structure	Procedures or functions	Classes containing data and code
Design approach	Top-down	Bottom-up
Emphasis	Program logic	Data and code built around data
Data access	Data flows freely	Data is bound within classes
Security	Almost no access control	Multiple access levels
Features	Does not provide inheritance or polymorphism	Provides inheritance and polymorphism