Abstraction & Polymorphism in Depth | Abstract Class vs Interfaces | Java Full Course #17

In this lecture of the Java Full Course, we dive deep into two of the most important Object-Oriented Programming concepts : Abstraction and Polymorphism.

You will learn how abstraction hides complexity, how abstract classes and interfaces work internally, and how Java achieves polymorphism using method overloading and method overriding.

We will also understand the difference between abstraction and encapsulation, and explore how static and final methods behave in polymorphism.

This lecture builds the core foundation of OOP used in real-world Java development, system design, and backend engineering.

Topics Covered
✔What is Abstraction in Java
✔ Types of Abstraction
✔ Low Level vs High Level Abstraction
✔ Abstract Classes Explained
✔ Interfaces in Java
✔ Abstract Class vs Interface (Interview Favourite)
✔ Abstraction vs Encapsulation
✔ What is Polymorphism
✔ Static Polymorphism (Method Overloading)
✔ Dynamic Polymorphism (Method Overriding)
✔ Static & Final Methods in Polymorphism

Why Learn Java?
Java is one of the most powerful and widely used programming languages in the world.
It is used in:
Backend development
Enterprise applications
Android development
Banking systems
Large-scale distributed systems

If you want to master Data Structures, Spring Boot, Microservices, or System Design, Java fundamentals are essential.

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Code and Notes: Github : https://github.com/adityatandon15/Java-Full-Course

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Timestamps:

00:00 Intro
00:53 Abstraction
11:44 Types of Abstraction
13:22 Low level Abstraction
17:28 High level Abstraction
28:29 Abstract classes
43:40 Interfaces
49:55 Abstract class vs Interfaces
01:02:14 Abstraction vs Encapsulation
01:04:24 Polymorphism
01:05:23 Static Polymorphism
01:09:55 Dynamic Polymorphism
01:16:21 Static & final methods in Polymorphism
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