Explore the fundamentals of OOP in Java. Gain insights into inheritance, polymorphism, and more to write clean, modular, reusable code through interactive exercises and practical challenges.

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Object-oriented programming (OOP) has been around for decades. As the original object-oriented language, Java is a mainstay in the world of computer programming. 

Having a foundation in OOP Java concepts will allow you to write cleaner, more modular, and more reusable code, as well as make it easier for you to understand the codebases of different companies you might be interested in joining.

Starting with the basics and reviewing complex topics like inheritance and polymorphism, this course is filled with illustrations, exercises, quizzes, and hands-on challenges. You’ll walk away with an understanding of classes and objects behavior and be able to easily create simple, efficient, reusable and secure code.

Learn Object-Oriented Programming in Java

# What is the `super` keyword?

`this` keyword in Java is used to refer to the *instance* of the current class.

In a similar fashion, the `super` keyword in Java is used to refer to the *SuperClass* members from inside the immediate *Subclass*. The use of `super` comes into play when we implement inheritance.

# Use cases of the `super` keyword

The super keyword is used in *three* major contexts:

## Accessing parent class fields

Consider the fields named as `fuelCap` defined inside a `Vehicle` class to keep track of the *fuel capacity* of a vehicle. Another class named as `Car` *extends* from this `Vehicle` class. We declare a field inside the `Car` class with the same name i.e. `fuelCap` but different value. Now if we want to refer to the `fuelCap` field of the *SuperClass* inside the *Subclass,* we will then have to use the `super` keyword.

Let's understand this using a bit of code.

Learn about the uses of the super keyword in Java.

Introduction to Object-Oriented Programming

Classes and Objects

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Data Hiding

Composition, Aggregation and Association

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Object Oriented Programming in Java - Exam I

Inheritance

Polymorphism

Abstract Classes and Interfaces

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Object Oriented Programming in Java - Exam II

Super Keyword

What is the `super` keyword?

Use cases of the `super` keyword

Accessing parent class fields