Let's Start Exploring OOP without saying OOPS. #Day1
Tags: oop, java, basic, webdev
Published: 2024-06-01 18:53:20

Think Like an Object: A Fresh Approach to Programming 
**Let Me Start with WHAT IS WHAT**

_**Object-Oriented Programming (OOP)** is a paradigm that uses "objects" to design applications and programs._

**An object** is a self-contained unit that combines data (attributes or properties) and behavior (methods or functions) into a **single entity**. For now, imagine an object as a blueprint for a real-world thing.

If you're new to OOP, the definition might seem confusing because of the unfamiliar terminology.
![Confusing](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/5qmbe2aq47cfo0iu0mow.jpg)

Let's simplify it by comparing it to a real-world example, like a movie.

**Understanding Domains in OOP**

You might wonder, why are we talking about domains? Well, a domain is a core building block in OOP. Think of a domain as a fundamental category or concept in the real world. For instance, let's consider the domain of "Movie."

**Breaking Down the Movie Domain**

A Movie is a domain. But what makes up a movie? Movies can be of various types, such as Action, Comedy, and Drama. Each type has its own unique properties and behaviors. Let's break it down:

- **Action Movie**: What makes an action movie unique? It has action sequences, stunts, and fast-paced scenes. These are its specific properties and behaviors.
- **Comedy Movie**: How about a comedy? It focuses on humor, funny dialogues, and entertaining plots.
- **Drama Movie**: And a drama? It emphasises emotional storytelling, complex characters, and serious themes.

**Connecting to OOP**

In OOP, we create objects that represent these real-world entities. Each object (like an Action Movie) will have its own attributes (like stunts, special effects) and methods (like `playActionSequence()`).

So, by thinking of a domain as a core concept and its types as specific variations with unique properties and behaviors, you can better understand how OOP models real-world scenarios.

### Key Points to Remember

- **Domain**: A core concept or category (e.g., Movie).
- **Types of Domain**: Specific variations within the domain (e.g., Action, Comedy, Drama).
- **Properties and Behaviors**: Unique characteristics and actions of each type (e.g., action sequences for Action Movies).

By comparing OOP concepts to real-world examples, it becomes easier to grasp how objects, domains, and their types work together to create complex and dynamic programs.

![cool right](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/uqrp4bzisfwqc912jslb.png)


**_Understanding the Four Pillars of Object-Oriented Programming (OOP) Through the Example of a Movie_**

Object-Oriented Programming (OOP) isn't just about creating objects; it's built on four main pillars that make it a powerful and widely-used programming paradigm. Without these pillars, OOP would lose its strength and structure. Let's explore these foundational concepts using the example of a movie.

**Why are these pillars important?**

You might wonder why we refer to them as the pillars of OOP. It's because, without these core concepts, OOP wouldn't be as robust and effective. These pillars give OOP its structure, making it a reliable and efficient way to design and build applications.


![Pillars of OOP](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/vh8ozw9acgjk8b0z4ihz.png)

**_The Four Pillars of OOP__**
**1. Encapsulation**

**What is Encapsulation?**
Encapsulation is about bundling the data (attributes) and methods (functions or behaviours) that operate on the data into a single unit, typically a class.

**Real-World Example:**
Think of a movie. "Epic Quest" has various details like the title, genre, duration, and cast. These details are encapsulated within the movie, and viewers interact with the movie as a whole rather than its individual parts. You don’t need to know all the production details to enjoy it; you just watch it.

**In Programming:**
In OOP, encapsulation bundles data and methods within a class. For example, a `Movie` class might have attributes like title, genre, and duration, and methods like play, pause, and stop. This hides the internal workings and exposes only necessary interfaces.

**Why is it needed and beneficial?**
Encapsulation protects the integrity of the data by preventing outside interference and misuse. It makes the code more modular and easier to maintain. By hiding complex details, it simplifies interaction and usage.

**_2. Abstraction_**

**What is Abstraction?**
Abstraction means hiding complex implementation details and showing only the necessary features of an object. This simplifies the interaction with the object.

**Real-World Example:**
When you watch a movie, you see the final product on the screen, not the behind-the-scenes work like editing, special effects, and direction. The complex details are hidden, and you can enjoy the movie through a simple interface.

**In Programming:**
In OOP, abstraction allows you to interact with objects at a high level. For example, a `StreamingService` class might have methods like watchMovie, browseMovie without exposing the complex logic behind these actions.

**Why is it needed and beneficial?**
Abstraction makes the code more readable and easier to understand. By exposing only the necessary details, it reduces complexity and enhances usability.

#### 3. Inheritance

**What is Inheritance?**
Inheritance allows a new class to inherit properties and behaviors (methods) from an existing class. This promotes code reuse and establishes a hierarchical relationship between classes.

**Real-World Example:**
Think of movie genres. A general class called `Movie` might have properties like title and duration, and behaviors like play and pause. Specific genres like `ActionMovie` and `DramaMovie` can inherit these properties and behaviors, and also have additional features.

**In Programming:**
In OOP, you can create an `ActionMovie` class that inherits from the `Movie` class. This way, `ActionMovie` will have all the properties and methods of `Movie`, plus any additional ones defined in `ActionMovie`.

**Why is it needed and beneficial?**
Inheritance allows for code reuse and a clear structure. It helps in creating a more organized and manageable codebase.

**4. Polymorphism**

**What is Polymorphism?**
Polymorphism allows objects to be treated as instances of their parent class rather than their actual class. This enables one interface to be used for a general class of actions, with specific behavior determined at runtime.

**Real-World Example:**
Consider different movie genres like Action, Comedy, and Drama. Each genre has a play method, but the experience is different. An action movie has thrilling sequences, a comedy has funny scenes, and a drama has emotional storytelling.

**In Programming:**
In OOP, polymorphism allows you to call the play method on any `Movie` object, whether it’s an `ActionMovie`, `ComedyMovie`, or any other genre, and the correct method for that genre will be executed.

**Why is it needed and beneficial?**
Polymorphism makes the code more flexible and scalable. It allows the same method to perform different tasks based on the object it is acting upon, enhancing the ability to extend and maintain the code.

**Conclusion**

The four pillars of OOP—Encapsulation, Abstraction, Inheritance, and Polymorphism—form the foundation that makes Object-Oriented Programming robust, efficient, and easy to use. By understanding and applying these principles, you can create well-structured and maintainable code, making software development more efficient and manageable.

Next time you watch a movie, think about it in terms of objects and OOP. How would you represent your favorite film as an object, and what attributes and behaviors would it have? By drawing parallels between real-world examples and OOP concepts, you can program and appreciate the elegance of this powerful paradigm.

I trust you now have a clear understanding of object-oriented programming (OOP) without explicitly mentioning "OOP." Feel free to provide feedback if there are any areas you believe could be improved.

![Happy Programming](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/pl0cd8otpgzk4z5b8okj.jpg)