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 Java **class** called `Calculator` with 

* `private` *fields*: 

  * `num1` and `num2` (**double** type)

And *methods*:

* `add()`, a *method* which returns the addition of two numbers

* `subtract()`, a *method* which returns the subtraction of num1 from num2
 
* `multiply()`, a *method* which returns the multiplication of numbers

* `divide()`, a *method* which returns the division of num2 by num1

* Define a parameterized constructor which takes two parameters `num1` and `num2` and assigns these variables to the respective fields in the class.

## Input
Pass double point numbers in the parameterized constructor

## Output
addition, subtraction, division, and multiplication

## Sample Input

``` java
Calculator obj = new Calculator(10, 94);
obj.add()
obj.subtract()
obj.multiply()
obj.divide()
```
## Sample Output
``` java
104
84
940
9.4
```

In this exercise, you have to implement a calculator which can perform addition, subtraction, multiplication, and division.

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

Project: Doctor on Call

Object Oriented Programming in Java - Exam II

Challenge 5: Implement a Calculator Class

Problem Statement