How do aggregation and composition guide your class design in LLD for an Order module?

Problem Statement

Explanation

Use composition when an Order strictly owns its OrderItems. Deleting the Order deletes its items. This encodes lifecycle rules in the model itself and prevents orphan records. Use aggregation for looser ties, like Order referencing a Customer that exists independently. This keeps identity boundaries clear and avoids unintended cascading deletes.

Code Solution

SolutionRead Only

Order ◼─ OrderItem (composition)
Order ◇─ Customer (aggregation)

Practice Sets

This question appears in the following practice sets:

UML Essentials for System Design

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How do aggregation and composition guide your class design in LLD for an Order module?

Problem Statement

Explanation

Code Solution

Practice Sets

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Master Interviews Anywhere, Anytime

How do aggregation and composition guide your class design in LLD for an Order module?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which statement best describes the Single Responsibility Principle?

Open–Closed Principle encourages what practice when adding features?

High-Level Design (HLD) typically focuses on which artifacts?

Which UML diagram best captures interactions over time between components?

Which pairing describes a healthy design goal?

More from System Design

Master Interviews
Anywhere, Anytime