Beginner

Object-Oriented Programming

Learn the core principles of OOP that make Java powerful and flexible.

Topics

What is OOP?

Object-Oriented Programming (OOP) organizes code around objects (things with data + behavior) instead of isolated functions. As a Java beginner, think about how you would describe a real-world thing—its characteristics and what it can do—and then capture that in code.

In Java, almost everything is defined inside a class. Understanding how classes, objects, and the four pillars work together will make the rest of the language feel much easier.

The Four Pillars

• Encapsulation - Bundling data and methods
• Inheritance - Reusing code from parent classes
• Polymorphism - Many forms of the same method
• Abstraction - Hiding complex implementation

Benefits of OOP

• Modular and organized code
• Easier to maintain and update
• Code reusability through inheritance
• Real-world modeling