Cursos /

Java OOP

1. How to Work With IDE?

Installing IntelliJ IDEA (MacOS)

Installing IntelliJ IDEA (Windows)

Code Editor Main Features

Debugger

Packages

How to do Tasks?

2. OOP

Finally, we can start learning Object-Oriented Programming (OOP) in Java. It will be challenging, but I'm confident that you'll succeed! In this section, we'll cover all the principles of OOP, explain why OOP is important. You'll learn how to inherit classes, overload and override methods, encapsulate data from other classes, and work with abstraction. Moreover, you'll reinforce all these theoretical concepts with practical exercises, working on assignments in your IDE. You'll gain a wealth of knowledge, both practical and theoretical, so let's get started!

What is OOP?

OOP Principles: Inheritance

Challenge: Inheritance

OOP Principles: Polymorphism

Challenge: Polymorphism

OOP Principles: Encapsulation

OOP Principles: Abstraction

Challenge: Abstraction

3. Interface

In the previous section, we concluded that all Object-Oriented Programming is mainly built on abstraction. However, an abstract class has one significant limitation – you can inherit from only one abstract class. But what if we need more? Interfaces come to the rescue. In this section, you will learn what an interface is, why it's necessary, how to use it correctly, and you will continue practicing Object-Oriented Programming. Let's turn you into a professional!

What is Interface?

Challenge: Interface

Abstract Class vs Interface

Default Methods

Static Methods

Summary

Challenge: Inheritance

Task

Let's start with your first task. The assignment is posted on GitHub, and your task is to fork the repository and clone it to your IntelliJ. You can find instructions on how to do this in this chapter .

Link to the task: GitHub

There are several classes in the animals package. The Dog class has its own fields and methods, and there are three classes for different dog breeds: Bulldog, Doberman, and Beagle. The breed classes currently don't have their own fields and methods, but I need them to have the fields and methods from the Dog class. Inherit the Dog class in each of the breed classes and run the test to check if you have completed the task correctly.