Gain insights into OOP with C#. Delve into practical coding examples and exercises, exploring OOP concepts through a real-world vending machine project to understand and apply them effectively.

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Object-oriented programming (OOP) has been around for decades. As the original object-oriented language, C# is a mainstay in the world of computer programming.

All the concepts of object-oriented programming that C# developers love to have in their arsenal are explained in detail along with relevant coding examples and exercises in this course.

This course is unique in its nature as it follows a project-based learning approach. Throughout the course, a real-world example of vending machine is followed to help the learners develop a firm understanding of the stated OOP concepts.

The learners will not only be able to play around with the project,  they’ll also be able to see all the concepts in action in this project.

Learn Object-Oriented Programming in C#

// Class Rectangle
class Rectangle {

  // Private Fields
  private int _length;
  private int _width;


  // Parameterized Constructor
  public Rectangle(int length, int width) {
    this._length = length;
    this._width = width;
  }

  // Method to calculate Area of a rectangle
  public int GetArea() {
    return this._length * this._width; 
  }
  
}

class Program {
  public static void Main(){
    Rectangle obj = new Rectangle(2,2);
    System.Console.WriteLine(obj.GetArea());
  }
}

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.io.FileNotFoundException;

// Class Rectangle
class Rectangle {

  // Private Fields
  private int length;
  private int width;

  // Default Constructor
  public Rectangle() {
    this.length = 0;
    this.width = 0;
  }

  // Parameterized Constructor
  public Rectangle(int length, int width) {
    this.length = length;
    this.width = width;

  }

  // Method to calculate Area of a rectangle
  public int getArea() {
    return this.length * this.width; 
  }
}

## Explanation

The solution is straightforward.
* **Line 5-6:** Private fields are declared i.e. `length` and `width`.
* **Line 10-13:** Parameterized Constructor is implemented, and all the fields are set to respective parameters.
* **Line 17:** Provided the implementation of `GetArea()` method.
* **Line 24-25:** An object of `Rectangle` class is created and the `GetArea()` method is called.

This review provides a detailed analysis to solve the 'Implement the Rectangle Class using the Concepts of Encapsulation' challenge.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Abstract Classes and Interfaces

Composition, Aggregation and Association

Solution Review: Implement the Rectangle Class