OOP_Java_Part1OOP_Java_Part1OOP_Java_Part1.pptx

OOP_Java_Part1OOP_Java_Part1OOP_Java_Part1.pptx

• 1.
  Title Slide • UnderstandingObject-Oriented Programming in Java – Part 1 • Presented by: [Your Name] • Institution: [Your Institution] • Date
• 2.
  What is OOP? •Object-Oriented Programming (OOP) is a paradigm based on objects. • Real-world analogy: Car, Bank Account, Library Book. • Goal: Reusable and scalable components.
• 3.
  Principles of OOP •Encapsulation: Wrapping data and code into one unit. • Inheritance: Derive new classes from existing ones. • Polymorphism: One interface, many implementations. • Abstraction: Hide internal details.
• 4.
  Class and Objectin Java • Class: Blueprint of an object. • Object: Instance of a class. • Example: • class Car { • int speed = 0; • void accelerate() { • speed += 10; • } • }
• 5.
  Encapsulation • Protects datafrom unauthorized access. • Use of private variables and public get/set methods. • Example: • class Student { • private int rollNo; • public void setRollNo(int r) { rollNo = r; } • public int getRollNo() { return rollNo; } • }
• 6.
  Access Modifiers • public:Visible everywhere. • private: Within class only. • protected: Package & subclass. • default: Within package only.
• 7.
  Constructors in Java •Called when object is created. • Can be overloaded. • Example: • class Book { • Book(String t) { title = t; } • }
• 8.
  Case Study: BankAccount • Encapsulation and methods. • Example: • class BankAccount { • private double balance; • public void deposit(double amt) {...} • }
• 9.
  Summary • OOP simplifiesdesign. • Key concepts: Class, Object, Encapsulation. • Practice helps understanding.
• 10.
  Q&A / Activity •Create class: Library with bookId, title. • Set and get data using methods.