oops

1. Java OOP’s Concepts
By
Dr. Vipin Kumar

2. What is OOP’s
• OOP’s is the modern programming approach to
replace the older procedural or structural
programming approach. It is object based
programming approach to solve real life business
oriented problems.
• Its includes following techniques.
– Class
– Object
– Inheritance
– Polymorphism
– Abstraction
– Encapsulation

3. Class
• Class is a blueprint of an object.
• Class describes object properties and
behavior.

4. Object
• Object is an instance of class
• Object is the variable of user define data type
class

5. Inheritance
• It is the technique in OOP by which we make a
new class based on existing class, new class
extending the existing class and inheriting the
existing class attributes and methods.
• Existing class = super class/parent class
• New class = sub class/child class

6. Polymorphism
• It is the combination of two word poly +
morph
• Poly = many
• Morph = form
• It is the technique in OOP that refer to the
ability of an object to have many form.

7. Abstraction
• Abstraction is hiding internal implementation
and highlighting necessary information that is
required.
• In another way, we can say, It is the technique
in OOP that refer to the ability of an object to
show only necessary information of an object
to the client.
• Abstraction is the outcome of the
encapsulation

8. Encapsulation
• It is the technique in OOP by which we declare
private attributes in a class and access those
attributes by using public method. All
attributes are hiding from client access and
only access and modified by using getter and
setter method. Attributes can only be access
by getter method and can only be written by
setter method of that attribute.