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1. Object-Oriented Programming
(OOP) in Java
• An overview of OOP principles with examples.

2. Agenda
• 1. What is OOP?
• 2. Why OOP in Java?
• 3. Classes and Objects
• 4. Four Pillars of OOP
• 5. Advanced Features
• 6. Real-Life Applications
• 7. Conclusion

3. What is OOP?
• OOP is a programming paradigm based on the
concept of objects, which contain data and
methods.

4. Why OOP in Java?
• • Code reusability
• • Easier maintenance
• • Real-world modeling
• • Scalability

5. Classes and Objects
• • Class: Blueprint for creating objects
• • Object: Instance of a class

6. Example: Class and Object
• class Car {
• String color;
• int speed;
• void drive() {
• System.out.println("Car is driving at speed "
+ speed);
• }
• }

7. Encapsulation - Concept
• Encapsulation is wrapping data (variables) and
code (methods) together into a single unit.

8. Encapsulation - Example
• Getters and setters are used to control access
to private data members.

9. Inheritance - Concept
• Inheritance allows one class to acquire the
properties and methods of another.

10. Example: Inheritance
• class Animal {
• void sound() { System.out.println("Animal
makes a sound"); }
• }
• class Dog extends Animal {
• void sound() { System.out.println("Dog
barks"); }
• }

11. Polymorphism - Concept
• Polymorphism means the ability of an object
to take many forms.

12. Polymorphism - Types
• 1. Compile-time (Method Overloading)
• 2. Run-time (Method Overriding)

13. Abstraction - Concept
• Abstraction hides implementation details and
shows only functionality.

14. Abstraction - Analogy
• Example: You drive a car without knowing the
internal engine details.

15. Constructors in Java
• Special methods used to initialize objects.
Types: Default and Parameterized.

16. Method Overloading vs Overriding
• • Overloading: Same method name, different
parameters
• • Overriding: Redefining parent method in
child class

17. Interfaces in Java
• Interfaces provide a way to achieve
abstraction and multiple inheritance.

18. OOP in Real Life
• Example: Banking system, Library system, E-
commerce applications.

19. Advantages of OOP
• • Reusability
• • Flexibility
• • Modularity
• • Easy Maintenance

20. Conclusion
• Java OOP helps model real-world problems
effectively.
• Thank you!