Software Engineering Architecture Lab

Encapsulation, Tell Don’t Ask & the Law of Demeter

Put behaviour next to the data it protects, and stop reaching through objects. Lesson 6 of Level 3: Object-Oriented Design.

Level 3 · Object-Oriented Design · Lesson 6 of 6

Put behaviour next to the data it protects, and stop reaching through objects.

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All lessons in OO Design

Single Responsibility: One Reason to Change
Open/Closed: Add Features Without Editing Old Code
Liskov Substitution: Subtypes That Keep Their Promises
Interface Segregation & Dependency Inversion
Composition Over Inheritance
Encapsulation, Tell Don’t Ask & the Law of Demeter

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