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Learn OOPs (Object Oriented Programming System) Free Java OOPs Course

free java oops programming course

Learn OOPs (Object Oriented Programming System) Free Java OOPs Course

Learn OOPs (Object Oriented Programming System) Free Java OOPs Course

Learn OOPs (Object Oriented Programming System) Free Java OOPs Course

Overview of OOPs Concepts, What is OOPs, Learn OOPs?

What is OOPs?

OOPs stands for Object Oriented Programming systems.

OOP is a programming concept that is the core of Java. It works on the principle that objects are the most important part of your program. It allows users create the objects that they want and then create methods to handle those objects. Manipulating these objects to get results is the goal of Object Oriented Programming.

Core OOPs concepts are-

  1. OOPs Class

The class is a group of similar entities. It is only a logical component and not the physical entity.

A class is a template for multiple objects with similar features. They represent all the features of a particular set of objects.

Example- If you had a class called “Expensive Cars” it could have objects like Mercedes, BMW, Toyota, etc. Its properties(data) can be price or speed of these cars. While the methods may be performed with these cars are driving, reverse, braking etc.

  1. Object

An object is the representation of real world entities. It can be defined as an instance(example) of a class, and there can be multiple instances of a class in a program. An Object contains both the data and the function, which operates on the data.

Example – chair, bike, marker, pen, table, car, etc

  1. Abstraction

An abstraction is an act of representing essential/relevant features and hiding background details. It is a technique of creating a new data type that is suited for a specific application.

Abstraction is the concept of hiding the internal details and describing things in simple terms. There are many ways to achieve abstraction in object oriented programming, such as encapsulation and inheritance.


  • While driving a car, you do not have to be concerned with its internal working. Here you just need to concern about parts like steering wheel, Gears, accelerator, etc.
  • In java program, java takes care of converting simple statements to machine language and hides the inner implementation details from outer world.
  • A method that adds two integers. The method internal processing is hidden from outer world.
  1. Encapsulation

Encapsulation is the mechanism of wrapping the data and code together; and keeps both safe from outside interference and misuse. In Java, the basis of encapsulationhttps://www.certstore.in/best-complete-full-java-training-course.html is the ‘class’. The variables of a class are always hidden from other classes.

Example – in school, a student cannot exist without a class.

  1. Polymorphism

Polymorphism refers to the ability of a variable, object or function to take on multiple forms.

Example– In English, the verb “run” has a different meaning if you use it with “a laptop,” “a foot race”, or ”business”.  Here, we understand the meaning of “run” based on the other words used along with it. The same also applied to Polymorphism.

  1. Inheritance

Inheritance is an OOPS concept in which one object acquires the properties and behaviors of the other object(parent object). It’s creating a parent-child relationship between two classes.

Inheritance is the mechanism of code reuse. The object that is getting inherited is called superclass and the object that inherits the superclass is called subclass.

  1. Association

Association is a relationship between two objects. It defines the diversity/multiplicity between objects. In this OOP concept, all object have their separate lifecycle, and there is no owner.

Example- There is one to many relationship between a teacher and students. Similarly a student can have one to many relationship with teacher objects. However both student and teacher objects are independent of each other.

  1. Aggregation

Aggregation is a special type of association. In aggregation, objects have their own life cycle but there is an ownership. Whenever we have “HAS-A” relationship between objects and ownership then it’s a case of aggregation. The ownership is such that child object can’t belong to another parent object.

Example– consider class-objects department and teacher. Here, a single teacher can’t belong to multiple departments, but even if we delete the department, the teacher object will never be destroyed.

  1. Composition

Composition is a special case of aggregation. Composition is a more restrictive form of aggregation. When the contained object in “HAS-A” relationship can’t exist on it’s own, then it’s a case of composition.

It is also called “death” relationship. Child objects do not have their lifecycle so when parent object gets deletes all child objects will also get deleted automatically.

Example- House has-a Room. Here room can’t exist without house. One room can’t become part of two different houses. So, if you delete the house room will also be deleted.

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