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Object-oriented programming - Wikipedia
What is object-oriented programming? OOP explained in depth
What Is Object-Oriented Programming? - Codecademy
Introduction of Object Oriented Programming - GeeksforGeeks
Object-oriented programming - Learn web development | MDN
What is Object-Oriented Programming (OOP)? - TechTarget
OOP Meaning – What is Object-Oriented Programming?
Object-Oriented Programming | Brilliant Math & Science Wiki
Best Online Object-Oriented Programming Courses & Programs
Learn Java: Object-Oriented Programming | Codecademy