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Overview

Copyright (c) A|iens. All rights reserved. — Quick Facts

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Property: Detail

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Concept Name: Class

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Category: Core Programming / Object-Oriented…

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Paradigm: Object-Oriented (OOP)

Topic 1

Infobox

📚 | Property | Detail | |---|---| | Concept Name | Class | | Category | Core Programming /…

Topic 2

Kya Hai Class

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Class = Cookie cutter…

🔑

Object = Actual cookie (real…

⚡

Kya data hoga…

🎯

Kya kaam kar sakti hai…

Topic 3

Class vs Object

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Ek class → Multiple objects

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Har object apna unique data rakhta…

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Saare objects same methods share…

Topic 4

Class Hierarchy Diagram

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Vehicle = Base/Parent class —…

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Car aur Truck = Vehicle se inherit…

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ElectricCar aur SportsCar = Car se…

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Engine = Car ke andar Composition…

Topic 5

Anatomy of a Class

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Unique naam jo class ko identify…

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Convention: PascalCase (e.g.,…

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Naam noun hona chahiye (class ek…

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Object ka data store karte hain

Topic 6

Access Modifiers

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Minimal access principle: Sabse…

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Attributes = private (almost…

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Public methods = class ka API…

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Protected = sirf inheritance ke…

Topic 7

OOP Ke Chaar Pillars via Class

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Private attributes + Public…

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Bahar se seedha object.balance =…

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Method ke through:…

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Analogy: ATM machine — tum PIN…

Topic 8

Types of Classes

🚀 | Type | Description | Instantiable? | Key Use | |---|---|---|---| | Concrete Class |…

Topic 9

Class Relationships

📚 Classes ek doosre se kaise interact karti hain: | Relationship | Strength | Meaning |…

Topic 10

Constructor Types

💡 Constructor object create hote waqt automatically call hota hai: | Constructor Type |…

Topic 11

Class in Different Languages

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Java/C#: Most structured OOP —…

🔑

Python: Flexible — multiple…

⚡

C++: Powerful but complex —…

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JavaScript: Class ES6+ me…

Topic 12

SOLID Principles via Classes

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Without SOLID: God classes…

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With SOLID: Small focused classes,…

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Trade-off: Over-engineering bhi…

Topic 13

Class vs Struct vs Interface vs Enum

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Class: Complex entity with…

🔑

Struct: Small value type, 2-3…

⚡

Interface: Define contract,…

🎯

Enum: Fixed set of values that…

Topic 14

Advanced Concepts

💡

Python me har cheez ek object hai…

🔑

Metaclass define karti hai ki…

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type Python ka default metaclass…

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Custom metaclass: class creation…

Topic 15

Best Practices

🌟 1. Single Responsibility Follow Karo — Ek Class, Ek Kaam Ek class ko sirf ek reason se…

Topic 16

Common Mistakes

🚀 1. God Class Banana — Sab Kuch Ek Class Me Ek class me 2000 lines, 50 methods, 30 fields…

Topic 17

Interview Deep Dive

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Attributes: accountNumber,…

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Methods: deposit(), withdraw(),…

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account1 = BankAccount("ACC001",…

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account2 = BankAccount("ACC002",…

Topic 18

Glossary

💡 | # | Term | Explanation | |---|---|---| | 1 | Class | Blueprint/template jo objects ke…

Comparison

Class vs Object

⚖️

Kya Hai: Blueprint / Template /…

⚖️

Memory: Koi memory allocate nahi hoti…

⚖️

Kitne: Ek class = ek definition

Comparison

Class vs Struct vs Interface vs Enum

⚖️

What: Blueprint with data + behavior

⚖️

Memory: Heap (reference type)

⚖️

Inheritance: ✅ Yes

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

Quick Quiz

Quiz — Question 2

Complete! 🎉

Aliens Wiki · HIEN · Cinematic Knowledge

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➡️

Copyright (c) A|iens. All rights reserved.

Copyright (c) A|iens. All rights reserved. — Quick Facts

Property: Detail

Concept Name: Class

Category: Core Programming / Object-Oriented…

Paradigm: Object-Oriented (OOP)

Infobox

Kya Hai Class

Class = Cookie cutter…

Object = Actual cookie (real…

Kya data hoga…

Kya kaam kar sakti hai…

Class vs Object

Ek class → Multiple objects

Har object apna unique data rakhta…

Saare objects same methods share…

Class Hierarchy Diagram

Vehicle = Base/Parent class —…

Car aur Truck = Vehicle se inherit…

ElectricCar aur SportsCar = Car se…

Engine = Car ke andar Composition…

Anatomy of a Class

Unique naam jo class ko identify…

Convention: PascalCase (e.g.,…

Naam noun hona chahiye (class ek…

Object ka data store karte hain

Access Modifiers

Minimal access principle: Sabse…

Attributes = private (almost…

Public methods = class ka API…

Protected = sirf inheritance ke…

OOP Ke Chaar Pillars via Class

Private attributes + Public…

Bahar se seedha object.balance =…

Method ke through:…

Analogy: ATM machine — tum PIN…

Types of Classes

Class Relationships

Constructor Types

Class in Different Languages

Java/C#: Most structured OOP —…

Python: Flexible — multiple…

C++: Powerful but complex —…

JavaScript: Class ES6+ me…

SOLID Principles via Classes

Without SOLID: God classes…

With SOLID: Small focused classes,…

Trade-off: Over-engineering bhi…

Class vs Struct vs Interface vs Enum

Class: Complex entity with…

Struct: Small value type, 2-3…

Interface: Define contract,…

Enum: Fixed set of values that…

Advanced Concepts

Python me har cheez ek object hai…

Metaclass define karti hai ki…

type Python ka default metaclass…

Custom metaclass: class creation…

Best Practices

Common Mistakes

Interview Deep Dive

Attributes: accountNumber,…

Methods: deposit(), withdraw(),…

account1 = BankAccount("ACC001",…

account2 = BankAccount("ACC002",…

Glossary

Class vs Object

Kya Hai: Blueprint / Template /…

Memory: Koi memory allocate nahi hoti…

Kitne: Ek class = ek definition

Class vs Struct vs Interface vs Enum

What: Blueprint with data + behavior

Memory: Heap (reference type)

Inheritance: ✅ Yes

Visual Flow

See Also

Object-oriented_programming

Inheritance_(object-oriented_progra…

Polymorphism_(computer_science).md)

Encapsulation_(computer_programming…