Design an Elevator Control System

Q: Design an Elevator Control System

This question evaluates object-oriented design, state modeling, and scheduling algorithm competencies for coordinating multiple elevators, including class responsibilities, state transitions, and request dispatching.

Q: How do I approach Software Engineering Fundamentals interview questions?

Software Engineering Fundamentals questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master software engineering fundamentals interviews.

Question

Design an object-oriented elevator control system for a building with multiple floors and multiple elevators.

The system should support:

Hall requests from each floor, where a user can request to go up or down
Cabin requests from inside an elevator, where a user selects a destination floor
Tracking each elevator's current floor, direction, door state, and pending stops
Assigning hall requests to an appropriate elevator
Moving elevators efficiently while avoiding obviously poor scheduling decisions

Focus on clean object-oriented design and the core scheduling logic. You do not need to model low-level motor hardware, networking, or a graphical UI.

Discuss the main classes, responsibilities, state transitions, and how requests are processed. If useful, also describe a simple dispatch algorithm and how you would extend the design later.

Design an Elevator Control System

Quick Overview

Solution

Comments (0)