JavaObject-Oriented Programming (OOP)

Introduction to Object-Oriented Programming in Java

Understand the fundamentals of Object-Oriented Programming in Java, including why OOP is used and how it models real-world problems.

Introduction to Object-Oriented Programming (OOP)Link to this section

Object-Oriented Programming (OOP) is a programming paradigm that organizes code using objects and classes. Java is a purely object-oriented language (except for primitives).

OOP helps developers write clean, reusable, scalable, and maintainable code by modeling real-world entities.

What is an Object?Link to this section

An object is a real-world entity that has state (data) and behavior (methods).

Examples:
  1. Car (state: color, speed | behavior: drive, brake)
  2. Student (state: name, rollNo | behavior: study, attendExam)

tip

Objects are created at runtime and occupy memory.

What is a Class?Link to this section

A class is a blueprint or template used to create objects. It defines properties and behaviors common to all objects of that type.

Why Java Uses OOP?Link to this section

Java follows OOP to make software development easier and more efficient.

Key benefits:
  1. Code reusability
  2. Better data security
  3. Easy maintenance
  4. Scalability

note

Large applications rely heavily on OOP principles.

OOP vs Procedural ProgrammingLink to this section

In procedural programming, the focus is on functions and logic. In OOP, the focus is on objects and data.

warning

Using procedural style in large Java applications leads to poor maintainability.
Introduction to OOP in Java
Question 1 of 5

What does OOP stand for?

Introduction to OOP

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  1. Identify objects and classes from a real-world banking system.
  2. Create a simple class representing a Mobile Phone.
  3. Explain the difference between a class and an object in your own words.
  4. List advantages of OOP over procedural programming.
  5. Find a real-life example where OOP improves code reuse.