OOPS Concepts In Java

OOPS Concepts In Java: Object-oriented programming (OOP) is a popular programming paradigm for developing robust, modular, and maintainable software applications. In OOP, the code is organized around objects that interact with one another to perform tasks.

Java is one of the most widely used programming languages and is a prime example of an OOP language. It offers an extensive range of OOP concepts and features, including encapsulation, inheritance, polymorphism, and abstraction.

These concepts enable developers to write scalable, easy-to-maintain, and reusable code. In this context, this article will provide an overview of OOP concepts in Java, highlighting their benefits and how to implement them in software development.

What is Object Oriented Programming?

Object-oriented programming, or OOPs, is a programming approach that revolves around using objects. An object is like a container that holds both properties and behaviors. In programming, properties are represented as attributes, and behaviors are represented as methods. So, OOPs focus on building programs by creating objects with specific attributes and methods to perform actions.

In Object-Oriented Programming (OOP), programs are created by using objects that can interact with each other. One popular approach in OOP is class-based programming. Java is an example of a class-based, object-oriented programming language that follows the principle of “write once, run anywhere,” meaning that code written in Java can run on different platforms without needing to be rewritten.

Why are OOPs important?

We will explore its fundamental concepts and emphasize its advantages in the development process. By understanding the value of OOP, you can leverage its capabilities to build Java applications that are modular, easy to maintain, and capable of scaling effectively.

Reduces complexity: OOP simplifies the development process by allowing you to reuse code and avoid repetitive tasks. This reduces the complexity of writing and managing large programs, making them more manageable and easier to understand.

Reduces maintenance time: OOP’s modular approach helps isolate and address issues more efficiently. If there is a problem with a specific functionality or component, you can focus on that part without affecting the rest of the program. This saves time and effort during maintenance and debugging.

Widely applicable: OOPs are versatile and can be applied to various scenarios and industries. It provides a flexible framework to model and solve problems, making it valuable across business use cases. Whether you’re developing software for finance, healthcare, or any other domain, OOP can be applied effectively to address specific requirements.

OOPS Concepts

Let’s look into the object-oriented programming systems one by one so that you will not face difficulties understanding the OOPS concepts.

What is a Class?

A class is a blueprint or a template for creating objects with a common set of properties (data) and behaviors (methods). A class defines the structure and behavior of an object, including its attributes and operations.

For example, if we were to create a class for a car, we might define its attributes as make, model, color, and year. We could also define its operations or methods: start, stop, accelerate, and brake.

A Class also includes different components like:

  • Modifiers
  • Class Name
  • Super-class
  • Interfaces
  • Body

Also, the Classes are an essential aspect of object-oriented programming because they provide a way to organize and encapsulate code. They allow for creating of complex systems by breaking them into smaller, more manageable parts, making writing, maintaining, and reusing code easier.

class Class_Name
   member variables;

Once a class is defined, we can create instances of that class, known as objects. Each object created from the same class will have its own attributes and methods, but they will share the same structure and behavior defined in the class.

What is an Object?

An object is a class instance with its properties (data) and behaviors (methods). An object is created from a class and represents a specific entity or concept in the real world. Objects are essential to object-oriented programming because they provide a way to represent real-world entities and concepts in code.

They also allow for encapsulation, which means that the internal details of an object can be hidden from other parts of the code, making it easier to maintain and modify the codebase. Objects can interact with each other and perform tasks, allowing for the creation of complex systems by combining smaller, reusable objects.

For example, if we have a class for a car, an object of that class might represent a specific car with its own make, model, color, and year. Each object of the car class will have its own attributes, but they will share the same structure and behavior defined in the class.

What is a Constructor?

Constructors look like methods, but constructors are not methods. A constructor is a special method that is called when an object of a class is created. A constructor aims to initialize an object’s properties to a specific value or state.

There are some pre-defining rules for constructors, such as the name of constructors should be the same as the class name, and it does not return any value. Different types of constructors are present, like default constructors, no-args constructors, and parameterized constructors.


The main aim of abstraction is to hide the complexity from the user and show them the relevant information for the user. Let’s take a single example of a Phone, where you dial the number and talk to someone, but we are not worried about the inner implementation. Therefore, abstraction helps you reduce complexity.


Encapsulation is a mechanism where you bind the data member (Variables) and member function (Methods) together in a single unit. This mainly aims to hide your data to protect it from other modifications. Simply put, when creating a class, we are doing encapsulation.


The process of acquiring another class’s data member and member function is called inheritance. Because of inheritance, we can achieve the re-usability of the code of an existing class. If the subclass has some unique feature that needs to be implemented, then in the child class, we have defined the new features only, and the rest of the things you can inherit from the parent class.


Polymorphism means “many forms,” It’s another feature of Object-oriented programming by which we can do a single action differently. There are two various forms of Polymorphism. Is there


We hope the above explanations have given you a basic understanding of important Java OOPs concepts such as inheritance, encapsulation, abstraction, and polymorphism. If you want to know more about these topics, we have detailed posts dedicated to each concept for a more comprehensive understanding.

Applying these Java OOPs concepts in your programming can enhance your Java applications’ security, simplicity, and reusability. Start leveraging the power of OOPs in Java to create robust and efficient software solutions. Happy coding!

Ref: article

What are the OOPS concepts in Java?

OOPs stands for Object-oriented programming. OOPs in Java organize a program around the various objects and well-defined interfaces. The OOP concepts in Java are abstraction, encapsulation, inheritance, and polymorphism. These concepts aim to implement real-world entities in programs.

What are the four basics of OOP?

The four basics of OOP are abstraction, encapsulation, inheritance, and polymorphism. These are the main ideas behind Java’s Object-Oriented Programming.

What are the main features of OOPs?

The main features of OOPs concepts in Java are Classes, Objects, Encapsulation, Data Abstraction, Polymorphism, and Inheritance.

Why are OOPs concepts used?

Java OOPs concepts are useful for implementing real-world entities like abstraction, polymorphism, inheritance, and more into programming. Another reason for using OOPs concepts in Java is to ensure code security by combining data and functions together.

What are the advantages of OOPs?

There are several benefits of implementing OOP concepts in Java. A few of the major advantages are as follows: Reusability, Code maintenance, Data Redundancy, Security, Easy troubleshooting, Problem-Solving, Flexibility, and Design Benefits. Java OOP concepts are one of the core development approaches that is widely accepted.

What is the purpose of OOPs in Java?

OOPs in Java aim to enhance code readability and reusability by explaining a Java program efficiently. The OOPs concept in Java is useful for implementing real-world entities in programs.

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