Oops Intro

on

🧠 OOP (Object-Oriented Programming) – 

Object & Instantiation

📌 What is OOP?

  • OOP stands for Object-Oriented Programming.

  • In OOP, everything revolves around objects.

  • To perform any operation, we use objects — without objects, no real interaction with class data is possible.

🧱 What is an Object?

  • An object is an instance of a class.

  • It represents a real-world entity.

🔹 Examples

  • Bus 🚍

  • Pen 🖊️

  • Ball ⚽

🔍 Entity Concept

  • Any entity that has:

    • Identity

    • State

    • Behavior
      👉 is called an object/entity.

⚙️ Characteristics of an Object

1️⃣ State

  • Represents data (variables)

  • Example: color, size, speed

2️⃣ Behavior

  • Represents methods (functions)

  • Example: run(), write(), move()

⏱️ Runtime Object

  • A runtime object is created during program execution.

  • It comes into existence when the program runs and memory is allocated.

🏗️ Instantiation

  • Instantiation means creating an object and allocating memory to it.

✅ Syntax

Class_Name <object_name> = new Class_Name();

📌 Explanation

  • Class_Name → Class

  • <object_name> → Object (instance)

  • new → Allocates memory and creates object

⚠️ Important Points

  • When a class is defined → ❌ No memory is allocated

  • When an object is created (instantiated) → ✅ Memory is allocated

  • new keyword → Memory allocation operator

🧠 Key Takeaways

  • Object = Instance of a class

  • Objects represent real-world entities

  • Instantiation = Object creation + memory allocation

  • new keyword is mandatory to create objects

  • Objects enable access to data and behavior defined in class

This forms the core foundation of OOP, essential for mastering concepts like encapsulation, inheritance, and polymorphism.

Comments

Post a Comment