This repository contains resources to learn and practice Object-Oriented Design (OOD), with a focus on interview preparation. It covers OOP concepts, design principles, design patterns, and common design problems.

Introduction

• Introduction to Object-Oriented Design

Object Oriented Programming (OOP)

• Class & Object

Design Principles

• SOLID
• Don't Repeat Yourself (DRY)
• Keep It Simple, Stupid (KISS)
• You Aren't Gonna Need It (YAGNI)
• Separation of Concerns (SOC)
• Law of Demeter (LOD)

Design Patterns

Creational	Behavioral	Structural
Singleton	Strategy	Adapter
Factory	Observer	Proxy
Abstract Factory	Iterator	Facade
Builder	Command	Decorator
Prototype	State	Composite

Multithreading & Concurrency

• update soon

LLD Interview Problems

Object-Oriented Design Interview Delivery Framework

• Parking Lot
• Snake and Ladder
• Tic Tac Toe
• Vending Machine
• Elevator System
• ATM Machine
• Library Management System
• Notification Service
• Online Auction System
• In-Memory Cache
• Logging System
• Splitwise
• Chess Game
• File System
• Movie Booking System (BookMyShow)
• Ride Sharing App (Uber/Ola)
• Rate Limiter

Concurrency Interview Problems

• Producer Consumer Problem
• Print Zero Even Odd
• Fizz Buzz Multithreaded
• Design Bounded Blocking Queue
• Dining Philosophers
• Multithreaded Web Crawler