Here are Four Pillars of OOPs (Object-Oriented Programming) 1. Abstraction 2. Encapsulation 3. Inheritance 4. Polymorphism Abstraction Data abstraction refers to providing only necessary information about the data to the outside world, hiding the background info or implementation. Encapsulation Encapsulation is defined as binding together the data and the functions that manipulate them. Inheritance Inheritance is the process in which two classes have a relationship with each other, and objects o

Abstract Classes in Java Explained | Java OOP Concepts Tutorial