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OOD - Stack Overflow

hardLast edited: December 31, 2025

Problem Statement
Solution
1. Requirements Analysis
Functional Requirements
Non-Functional Requirements
2. Use Case Diagram
3. Class Diagram
4. Activity Diagrams
Activity: Post New Question with Bounty
Activity: Vote on Question or Answer
Activity: Accept Answer (Question Owner)
5. Java Implementation
Enumerations and Value Objects
User Management with Strategy Pattern for Privileges
Content Models with Template Method Pattern
Gamification System
Supporting Classes
6. Python Implementation
7. Key Design Decisions
1. Reputation-Based Privilege System (Strategy Pattern)
2. Atomic Vote Counting with Thread Safety
3. Immutable Bounty Deduction (Event Sourcing)
4. Single Answer Acceptance with Reversal
5. Tag Frequency Tracking with Dual Metrics
6. Close Reason Enumeration with Descriptions
7. Edit History with Diff Tracking
8. Moderation Action Logging
9. Badge Award Automation with Rule Engine
10. Daily Reputation Cap with Exclusions

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