What Is an Entity in Object Oriented Programming?


Larry Thompson

An entity is a fundamental concept in object-oriented programming (OOP). It represents a real-world object or concept that has attributes (data) and behaviors (methods). In OOP, entities are used to model and organize the code in a way that closely resembles the real-world.

What is an Entity?
An entity can be anything that exists in the real world. It can be a person, a car, a bank account, or even an abstract concept like a university course.

In OOP, entities are represented as classes. A class is a blueprint or template for creating objects. Objects are instances of classes that have their own unique set of attributes and behaviors.

Attributes of an Entity
Attributes define the characteristics of an entity. For example, if we consider the entity “Car,” its attributes could include color, brand, model, and price.

These attributes determine the state of an object. In OOP terminology, attributes are also known as instance variables or properties.

Behaviors of an Entity
Behaviors define what an entity can do or how it can interact with other entities. Continuing with our “Car” example, behaviors could include starting the engine, accelerating, braking, and turning. Behaviors are implemented as methods in OOP.

Example: Car Entity

Let’s take a closer look at how we can define a “Car” entity using HTML styling elements:

class Car {

    // Attributes

  • color
  • brand
  • model
  • price

    // Behaviors

  • startEngine()
  • accelerate()
  • brake()
  • turn(direction)


In this example, the class “Car” represents the entity “Car.” It has attributes such as color, brand, model, and price.

These attributes define the state of a car object. The class also has behaviors like startEngine(), accelerate(), brake(), and turn(direction). These behaviors define what a car object can do.

Benefits of Using Entities in OOP

Using entities in OOP provides several benefits:

  • Modularity: Entities allow us to break down complex systems into smaller, more manageable pieces. Each entity represents a specific functionality or concept.
  • Code Reusability: By defining entities as classes, we can create multiple instances (objects) of the same class.

    This promotes code reusability and reduces duplication.

  • Maintainability: Entities help make code more organized and easier to understand. Changes or updates to an entity can be made independently without affecting other parts of the code.

In conclusion, entities are an essential concept in object-oriented programming. They represent real-world objects or concepts and are implemented as classes with attributes (data) and behaviors (methods).

By using entities in our code, we can create modular, reusable, and maintainable systems. So next time you’re designing a program or application, think about the entities involved and how they can be modeled using classes in OOP.

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