Flipkart LLD Round: Stack Overflow Clone - Complete Java Code Implementation | Part 2
7Welcome 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
https://github.com/deeppatel23/Youtube-LLD/tree/main/StackOverflow/srcYoutub...
📋 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