OOD Fundamentals — Codemia

Object-oriented design is the backbone of modern software engineering interviews and production codebases alike. Every large system is built from classes that encapsulate state, expose behavior through interfaces, and collaborate through well-defined patterns. This course fixes the backwards approach by teaching design thinking first, pattern mechanics second, and real-world application throughout.

Course Content — 8 Chapters • 27 Lessons

Chapter 1 — OOP Foundations (3 lessons)

• Classes, Objects, and Encapsulation
• Inheritance and Polymorphism
• Abstract Classes and Interfaces

Chapter 2 — SOLID Principles (5 lessons)

• Single Responsibility Principle
• Open/Closed Principle
• Liskov Substitution Principle
• Interface Segregation Principle
• Dependency Inversion Principle

Chapter 3 — Creational Patterns (3 lessons)

• Factory and Abstract Factory
• Builder Pattern
• Singleton and Object Pool

Chapter 4 — Structural Patterns (3 lessons)

• Adapter and Facade
• Decorator Pattern
• Composite and Proxy

Chapter 5 — Behavioral Patterns (4 lessons)

• Strategy and State
• Observer and Mediator
• Command and Chain of Responsibility
• Iterator and Template Method

Chapter 6 — Classic OOD Problems: Part 1 (3 lessons)

• Design a Parking Lot
• Design an Elevator System
• Design a Library Management System

Chapter 7 — Classic OOD Problems: Part 2 (3 lessons)

• Design a Restaurant Order System
• Design a Movie Ticket Booking System
• Design a Chess Game

Chapter 8 — Advanced OOD (3 lessons)

• Design a Card Game Framework
• Design a File System
• Design an Online Shopping Cart