Getting Ready: The ATM System
Explore the design of an ATM system by breaking down its core components like card readers and cash dispensers. Learn to model transactions including withdrawals, deposits, and balance inquiries, while ensuring secure access and managing cash limits. This lesson guides you through a bottom-up design approach using class and sequence diagrams, preparing you to discuss requirements, handle edge cases, and apply design patterns effectively.
Problem definition
An automated teller machine (ATM) is a self-service terminal that enables bank customers to perform financial transactions without interacting with a human teller or visiting a physical bank branch. Through ATMs, users can perform essential banking operations such as depositing cash, withdrawing money, checking account balances, and transferring funds between accounts. ATMs are typically placed in accessible public locations like banks, malls, airports, and convenience stores to provide round-the-clock banking services.
In this LLD interview case study, you’ll focus on:
Enabling secure card-based access and PIN verification for users.
Supporting core transactions: cash withdrawal, deposit, balance inquiry, and fund transfer.
Managing cash inventory within the ATM, including ...