Why this matters
- Layers — detailed pointwise breakdown in the section below.
- Dependency rule — detailed pointwise breakdown in the section below.
- Use cases — detailed pointwise breakdown in the section below.
- CampusOS module — detailed pointwise breakdown in the section below.
- Games and architecture patterns signal staff+ depth.
Inward dependencies
Frameworks & driversDB, web, UI
Interface adapterscontrollers, gateways
Applicationuse cases
Domainentities, value objects
Overview
Domain at the centre; frameworks at the edge. Study each section below in order — every list is interview-ready reference material.
Layers
Points to cover
- Definition — what Layers means in one clear sentence
- When to use — the force or smell that triggers this concept
- CampusOS example — where this appears in parking, booking, or library modules
- How to explain — pointwise bullets you can say aloud in an interview
- Common mistake — what weak candidates do instead
- Refactor move — one concrete change that improves the design
Dependency rule
Points to cover
- Definition — what Dependency rule means in one clear sentence
- When to use — the force or smell that triggers this concept
- CampusOS example — where this appears in parking, booking, or library modules
- How to explain — pointwise bullets you can say aloud in an interview
- Common mistake — what weak candidates do instead
- Refactor move — one concrete change that improves the design
Use cases
Points to cover
- Definition — what Use cases means in one clear sentence
- When to use — the force or smell that triggers this concept
- CampusOS example — where this appears in parking, booking, or library modules
- How to explain — pointwise bullets you can say aloud in an interview
- Common mistake — what weak candidates do instead
- Refactor move — one concrete change that improves the design
CampusOS module
Points to cover
- Definition — what CampusOS module means in one clear sentence
- When to use — the force or smell that triggers this concept
- CampusOS example — where this appears in parking, booking, or library modules
- How to explain — pointwise bullets you can say aloud in an interview
- Common mistake — what weak candidates do instead
- Refactor move — one concrete change that improves the design
// CampusOS — apply "Layers" on paper first, then in code
public final class CleanArchitectureExample {
// 1. Name entities from the problem statement
// 2. Draw relationships before writing methods
// 3. Introduce patterns only when a force appears
}
Quick recall
Everything you need if you only revisit this box.
- Layers — review this slice before mock interviews.
- Dependency rule — review this slice before mock interviews.
- Use cases — review this slice before mock interviews.
- CampusOS module — review this slice before mock interviews.
Test yourself
Answer these before moving on — recall is what makes it stick.