Problems

11 design problems across 5 categories. Work through them in order or jump to any topic.

Getting Started

—
OOP Fundamentals — Design Review
SOLIDOOP
Easy
—
What is an OOD Interview?
Interview Prep
Easy
—
A Framework for the OOD Interview
Interview Prep
Easy

Real World Systems

1
Design a Parking Lot
SingletonFactoryStrategy
Medium
2
Design a Movie Ticket Booking System
ObserverFactorySingleton
Medium
9
Design a Restaurant Management System
ObserverFactoryState
Hard
10
Design a Grocery Store System
ObserverStrategyFactory
Medium
11
Design a Shipping Locker System
StrategyObserverSingleton
Medium

State Machines

3
Design a Vending Machine
StateSingleton
Medium
4
Design an Elevator System
StateStrategyObserver
Hard

Financial Systems

5
Design an ATM System
StateSingletonChain of Responsibility
Medium

Games

6
Design a Tic Tac Toe Game
StrategyObserver
Easy
7
Design a Blackjack Game
StrategyObserverFactory
Medium

File Systems

8
Design a Unix File Search System
CompositeChain of ResponsibilityBuilder
Medium