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

# Introduction

In *OOP*, objects and classes are the basic entities.  Objects are created using classes. One can observe that classes contain data members and objects are created to manipulate and access this data. To make this object-oriented system more reliable and error free, it is a good practice to limit access to the class members.
> In layman's terms, *data hiding* refers to the concept of **hiding the inner workings of a class** and simply providing an **interface** through which the outside world can interact with the class without knowing what's going on inside.

The purpose is to implement classes in such a way that the instances (objects) of these classes should not be able to cause any unauthorized access or change in the original contents of a class. One class does not need to know anything about the underlying algorithms of another class. However, the two can still communicate.

# A Real Life Example

Let's apply this to a real-world scenario. Take the doctor-patient model. In case of an illness, the patient consults the doctor, after which he or she is prescribed the appropriate medicine.

The patient only knows the process of going to the doctor. The logic and reasoning behind the doctor's prescription of a certain medicine are unknown to the patient. A patient will not understand the medical details the doctor uses to reach his/her decision on the treatment.

This is a classic example of the patient class interacting with the doctor class without knowing the inner workings of the doctor class.



In this lesson, you will get familiar with a very important aspect of Object Oriented Programming called data hiding.

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

What is Data Hiding?

Introduction