What Object Oriented Programming Is and Why It Is Important?


Heather Bennett

Object Oriented Programming (OOP) is a programming paradigm that organizes code into objects, each representing an instance of a class. It is an approach to software development that focuses on creating reusable, modular, and maintainable code. OOP has gained popularity over the years because of its numerous benefits and advantages.

Why OOP is Important?

1. Code Reusability: One of the key advantages of OOP is code reusability.

With the use of classes and objects, you can create reusable code modules. This means that once you have defined a class, you can create multiple instances (objects) of that class without having to rewrite the entire code again. This saves time and effort in developing new applications as existing code can be reused.

2. Modularity: OOP promotes modularity by breaking down large programs into smaller, more manageable modules called classes.

Each class encapsulates data and functionality related to a specific task or concept. This modular approach makes it easier to understand, maintain, and update code as each module can be developed independently.

3. Encapsulation: Encapsulation is the practice of hiding internal details and providing only necessary information through well-defined interfaces (methods). By encapsulating data within objects, OOP ensures data integrity and protects it from unauthorized access or modification.

4. Inheritance: Inheritance allows the creation of new classes based on existing ones.

It enables the reuse of common attributes and behaviors from parent classes in child classes, reducing redundancy in code. Inheritance promotes code organization, extensibility, and flexibility.

5. Polymorphism: Polymorphism allows objects to take on multiple forms or behave differently depending on the context or situation.

It enables flexibility by allowing different objects to respond differently to the same message or method call. Polymorphism enhances code readability and maintainability.

Defining Objects and Classes

To understand OOP, it is important to understand the concepts of objects and classes. An object is an instance of a class, while a class is a blueprint or template for creating objects. Let’s consider an example of a class called “Car”:

class Car {
private String make;
private String model;
private int year;

public Car(String make, String model, int year) {
this.make = make;
this.model = model;
this.year = year;

public void startEngine() {
System.out.println(“Engine started!”);

public void accelerate() {

// Other methods and properties.


In the above example, we have defined a class named “Car” with three private attributes (make, model, year) and two methods (startEngine and accelerate). The constructor initializes the object when it is created.

To create an instance of the “Car” class:

Car myCar = new Car(“Toyota”, “Camry”, 2020);

Here, we create an object named “myCar” using the constructor of the “Car” class. We can then access its methods and properties using dot notation:

myCar.startEngine(); // Output: Engine started!
myCar.accelerate(); // Output: Accelerating.


Object Oriented Programming is an important approach to software development that offers numerous benefits like code reusability, modularity, encapsulation, inheritance, and polymorphism. By organizing code into objects and classes, OOP allows for more efficient development, easier maintenance, and greater flexibility in creating complex applications.

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