Asymptotic notation is a way to describe

the efficiency of algorithms by representing their growth rate as the input size becomes very large. The main notations are Big O (upper bound/worst-case), Omega (lower bound/best-case), and Theta (tight bound/average-case)

2. Any real world entity which can have some
characteristics or which can perform some
tasks is called as Object.
Example:

3. A class is a group of objects having similar
properties and behavior.
We call it a blueprint of how the object should
be represented. Mainly a class would consist of
a name, attributes, and operations [1].
Example:

4. Class
Object

6. Object-
oriented Programming is a way to construct a
programme using classes or artifacts. Object-
oriented Programming.  
It simplifies the development and maintenance 
of software through certain principles:
Object
Class
Inheritance
Polymorphism
Abstraction
Encapsulation

7. Object Oriented features [2]

8. When one object acquires all the properties
and behaviors of a parent object, it is known as
inheritance. It provides code reusability. It is
used to achieve runtime polymorphism.

9. It is known as polymorphism if one job is done in various ways. 
For example , in order to persuade the client differently, draw s
omething such as the form, triangle, rectangle, etc.

10. Hiding internal details and showing functionality is known as
abstraction. For example phone call, we don't know the internal
processing.
In Java, we use abstract class and interface to achieve
abstraction.

11. The encapsulation is defined as the joining (or wrapping) of cod
e and data together into one structure. A capsule is filled, 
for example, with various medicines. The example of encapsulat
ion is a java class. 
Java bean is the fully encapsulated class because every data me
mber here is private.
Encapsulation in java [3]

12. [1] Michael R Blaha, James R Rambaugh, “Object
Oriented Design and Modeling with UML” , Pearson,
2005
[2] Java OOPs Concepts, 2018,
https://www.javatpoint.com/java-oops-concepts.
[3] Encapsulation in Java with Realtime Example and
its Advantages, 2020
https://data-flair.training/blogs/encapsulation-in-java

13. Thanks