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

## Problem Statement

Write a method in a `Circle` class which overrides a method in a `Shape` class i.e. `getArea() and returns the area of a circle`.

> The value of Pi is 3.14.

You are given a partially completed code in the editor. Modify the code so that the code prints the following:

### Input:
radius

### Output:
area of a circle

### Sample Input

```Java
       Shape circle = new Circle(2);
       System.out.println(circle.getArea());
```

### Sample Output
```Java
                  12.56
```



# Problem Statement

Write a method in a `Circle` class which overrides a method in a `Shape` class i.e. `getArea() and returns the area of a circle`.

> The value of Pi is 3.14.

You are given a partially completed code in the editor. Modify the code so that the code prints the following:

## Input:
radius

## Output:
area of a circle

## Sample Input

```Java
       Shape circle = new Circle(2);
       System.out.println(circle.getArea());
```

## Sample Output
```Java
                  12.56
```



Can you override the getArea() method in a derived class of the base class? A solution is placed in the "solution" section to help you, but we would suggest you try to solve it on your own first.

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

Challenge 2: Implement and Override the Method

Problem Statement #