Object-Oriented Design: Designing an ATM

Translating real-world machinery into clean, logical software architecture can be challenging for beginner programmers. This text-based course guides you step-by-step through solving a classic system design and free-response question: designing an ATM. You will learn how to gather system requirements, identify essential classes, map out relationships, and implement a robust object-oriented solution. What you'll learn: Understand core object-oriented principles like encapsulation and abstraction in a practical context; Identify key system entities such as Users, Accounts, Cards, and Transactions; Apply state management concepts to handle different ATM phases like card insertion, authentication, and dispensing; Analyze and draft clean class structures and relationship flows; Practice writing modular, readable code snippets to implement your design decisions. You will start with foundational definitions and requirements gathering before diving into class structures, state transitions, and clean code implementation. This course is designed for beginners in computer science, students preparing for free-response exam questions, and aspiring developers looking to build strong software design skills. No advanced programming experience is required. Begin reading today to master the essentials of object-oriented system design.