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

`Composition` is the practice of creating other class objects in your class. In such a scenario, the class which creates the object of the other class is known as the *owner* and is responsible for the lifetime of that object.

 Composition relationships are **Part-of** relationships where the *part* must constitute part of the whole object. We can achieve composition by adding smaller parts of other classes to make a complex unit.

So, what makes the composition so unique? 

> In **composition**, the lifetime of the owned object depends on the lifetime of the owner. 

# Example

A `car` is composed of an *engine*, *tires*, and *doors*. In this case, a `Car` owns these objects so a `Car` is an *Owner* class and `tires`,`doors` and `engine` classes are *Owned* classes. 

In this lesson, you'll learn how to achieve composition 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

Composition