Flipkart LLD Round: Stack Overflow Clone - Complete Java Code Implementation | Part 2

Welcome to Part 2! Time to bring our Stack Overflow design to life with complete Java implementation. This is the EXACT code that can help you crack Flipkart's machine coding round!

🎯 What You'll See in Part 2:
✅ Complete Java code implementation from scratch
✅ All design patterns in action (Strategy, Factory, Observer)
✅ Working demo with multiple test cases
✅ Proper error handling and validations
✅ Clean, modular, and extensible code structure
✅ Driver class with comprehensive testing
✅ Concurrent request handling
✅ In-memory data storage implementation

🏗️ Code Structure Covered:
- Model classes (User, Topic, Question, Answer, Post)
- Service layer (AuthService, UserService, PostService, FeedService)
- Enums and Constants (FilterType, PostType, QuestionStatus)
- Design Patterns implementation
- Exception handling
- Data storage with Maps and Lists

💡 Key Features Implemented:
- User signup, login, logout
- Topic subscription/unsubscription
- Question posting with multiple topics
- Answer system with acceptance mechanism
- Upvoting system for questions and answers
- Advanced feed filtering (topic-based, status-based)
- User profile management
- Question details view

🔥 Design Patterns in Action:
- **Strategy Pattern:** Feed filtering logic
- **Factory Pattern:** Post creation (Question/Answer)
- **Observer Pattern:** Notification system
- **Decorator Pattern:** Advanced filtering

Github: https://github.com/deeppatel23/Youtube-LLD/tree/main/StackOverflow/src
📋 Features Demonstrated:
- Multiple users interacting simultaneously
- Complex filtering scenarios
- Edge case handling
- Error scenarios and validations
- Real-world usage patterns

💼 Perfect for:
- Machine coding round preparation
- Learning practical design pattern implementation
- Understanding clean code architecture
- System design interview practice
- Java developers wanting to improve code quality

🔧 Technologies Used:
- Core Java (Collections, OOP concepts)
- Design Patterns
- In-memory data structures
- Exception handling
- Multithreading concepts

📝 Code Available:
- GitHub link in comments (star the repo!)
- All files organized and well-documented
- Ready to run and test

🔔 What's Next?
- Advanced features implementation
- Database integration version
- Microservices architecture approach
- Performance optimization techniques

🏆 This implementation follows industry best practices and can be directly used in coding interviews!

💬 Drop your questions in comments - I'll personally answer each one!

#JavaImplementation #LowLevelDesign #StackOverflow #FlipkartInterview #DesignPatterns #JavaCode

Core Implementation & Code:

#JavaImplementation
#JavaCode
#JavaProgramming
#CodeImplementation
#LiveCoding
#JavaTutorial
#CodeWalkthrough
#JavaProject
#PracticalCoding
#HandsOnCoding
#CodeDemo
#WorkingCode
#JavaDevelopment
#CodeExample
#RealWorldCoding

LLD & System Design:

#LowLevelDesign
#LLD
#SystemDesign
#LLDImplementation
#SystemDesignCode
#LowLevelSystemDesign
#DesignToCode
#SoftwareDesign
#CodeArchitecture
#SoftwareArchitecture
#SystemImplementation
#DesignPatternImplementation
#ObjectOrientedDesign
#CleanArchitecture
#ModularCode

Interview & Career:

#FlipkartInterview
#MachineCodingRound
#CodingInterview
#TechInterview
#InterviewPrep
#CodingRound
#InterviewCoding
#LiveCodingInterview
#PracticalInterview
#TechInterviewPrep
#SoftwareEngineerInterview
#InterviewQuestions
#FAANG
#ProductCompanies
#InterviewSuccess

Design Patterns in Action:

#DesignPatterns
#StrategyPattern
#FactoryPattern
#ObserverPattern
#DecoratorPattern
#DesignPatternJava
#PatternImplementation
#PracticalPatterns
#DesignPatternCode
#PatternInAction
#SoftwarePatterns
#CodePatterns
#ArchitecturalPatterns
#ObjectOrientedPatterns
#DesignPatternDemo

Specific Project Features:

#StackOverflow
#StackOverflowClone
#QASystem
#ForumImplementation
#UserManagement
#AuthenticationSystem
#FeedSystem
#VotingSystem
#FilteringSystem
#TopicSubscription
#QuestionAnswer
#UpvoteSystem
#InMemoryDatabase
#DataManagement
#CRUDOperations

Educational & Learning:

#JavaLearning
#LearnJava
#ProgrammingTutorial
#CodingTutorial
#JavaEducation
#TechEducation
#ProgrammingEducation
#CodingEducation
#SoftwareTutorial
#TechTutorial
#SkillDevelopment
#ProfessionalDevelopment
#DeveloperEducation
#TechTraining
#CodingSkills

Code Quality & Best Practices:

#CleanCode
#CodeQuality
#BestPractices
#CodingBestPractices
#JavaBestPractices
#SoftwareBestPractices
#CodeStandards
#ProfessionalCode
#IndustryStandards
#CodeReview
#SoftwareQuality
#MaintainableCode
#ExtensibleCode
#ScalableCode
#ReadableCode

Technical Concepts:

#JavaCollections
#OOPConcepts
#ExceptionHandling
#Multithreading
#ConcurrentProgramming
#DataStructures
#Algorithms
#JavaOOP
#Inheritance
#Polymorphism
#Abstraction
#Encapsulation
#JavaFeatures
#CoreJava
#AdvancedJava

Видео Flipkart LLD Round: Stack Overflow Clone - Complete Java Code Implementation | Part 2 канала Deep Tech