Room type hierarchy in LLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a room type hierarchy in system design?

A room type hierarchy organizes different room categories in a structured way, showing parent-child relationships. It helps manage shared and specific properties efficiently.

beginner

Why use inheritance in a room type hierarchy?

Inheritance allows child room types to reuse common features from parent types, reducing duplication and making the system easier to maintain.

intermediate

How does polymorphism help in a room type hierarchy?

Polymorphism lets the system treat different room types uniformly while allowing each type to behave differently when needed.

intermediate

What is the benefit of using composition over inheritance in room type design?

Composition allows building room types by combining smaller parts or features, offering more flexibility and easier changes than rigid inheritance chains.

advanced

Name a common challenge when designing a room type hierarchy.

One challenge is balancing between too many specific types (which complicate the system) and too few (which reduce flexibility).

What does a room type hierarchy primarily represent?

A A structure showing relationships between room categories

B A list of all rooms in a building

C A database of room prices

D A schedule for room cleaning

A room type hierarchy organizes room categories by their relationships, not by lists or schedules.

Which principle helps avoid repeating common room features in multiple types?

A Encapsulation

B Inheritance

C Abstraction

D Polymorphism

Inheritance allows sharing common features from parent to child room types.

What is a downside of deep inheritance in room type hierarchies?

A It reduces code reuse

B It improves flexibility

C It makes the system rigid and hard to change

D It simplifies debugging

Deep inheritance can make the system rigid and difficult to modify.

Which design approach allows combining features to build room types?

A Polymorphism

B Inheritance

C Encapsulation

D Composition

Composition builds complex types by combining smaller parts or features.

Polymorphism in room types allows:

A Different room types to be treated the same way with specific behaviors

B Rooms to change their size automatically

C Rooms to share the same price

D Rooms to be cleaned faster

Polymorphism lets different room types respond differently while using the same interface.

Explain how you would design a room type hierarchy for a hotel system.

Think about shared features like size or amenities and specific ones like suite or deluxe.

What are the advantages and disadvantages of using inheritance in room type hierarchies?

Consider how inheritance helps and when it might cause problems.