Key Insights and Tips: Designing ATM
Discover how to design a robust ATM system by understanding key object-oriented design principles and patterns. Learn to avoid frequent design errors like poor state modeling and hardcoded logic. Gain insights into secure authentication, transaction validation, and modular design approaches. Test your knowledge with a quiz and explore related case studies to strengthen your practical understanding of OOD in real-world systems like vending machines and online banking portals.
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Congratulations on completing the case study for designing an ATM system. This lesson builds on your learning by highlighting common design mistakes, offering key interview tips, and including a short quiz to assess your understanding. You’ll also find related case studies that strengthen your grasp of modular, state-driven object-oriented design.
Common mistakes
Avoiding these common mistakes will help you create a more reliable and scalable ATM:
Poor state modeling: Using conditionals instead of concrete states like
IdleState,HasCardState, orCashWithdrawalStateleads to tangled logic. ...