Based on available resources for mastering Java, particularly with a focus on Object-Oriented Programming (OOP) in 2026, the key focus is on foundational keywords and concepts. Understanding these is essential for building, scaling, and maintaining Java applications. Core Object-Oriented Principles & Keywords
Encapsulation: Combines data and methods and safeguards data through the use of private variables and public methods.
Abstraction: Conceals intricate implementation details and reveals only necessary information to the user via abstract classes and interfaces.
Inheritance: Enables a class to inherit properties from another class using the extends keyword, establishing an “is-a” relationship.
Polymorphism: Allows a single method to exhibit varied behavior through method overloading (compile-time) and method overriding (runtime).
This video explains the four fundamental principles of OOP in Java:
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