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.

cpp17.tar.gz

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 multiple inheritance?
When a class is derived from more than a single base class, i.e. when a class has more than one immediate parent classes, it is an instance of **Multiple Inheritance**.
**Example:**
* A Hyundai `Elantra` **IS A** `Car`
* A Hyundai `Elantra` **IS A** `Sedan` as well

# Implementation
In Java, a class can't extend from more than one class. So the question arises, "*how can we implement multiple inheritance?*" 

The answer to the above question is ***Interfaces***. In Java, *multiple inheritance* can be implemented using interfaces.
>A class can `implement` more than one interfaces and an interface can `extend` from more than one interfaces.

So in this way, we can achieve multiple inheritance in Java.

# An example

Let's implement the example of Elantra given at the start of the lesson. This example can be implemented using:
* A base *class* named `Car`
* An *interface* named `IsSedan`
* An `Elantra` class derived from `Car` and implementing `IsSedan`

The above illustration then becomes:


Learn what multiple inheritance is and how it can be implemented 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

Multiple Inheritance

What Is multiple inheritance?

Implementation