The Dependency Injection Principle — Roadmap Step & Resources
Depending on abstractions instead of concrete implementations — the idea Spring is built around
- Level: intermediate
- Estimated time: 1 days
- Roadmap: Java + Spring Boot
Before this step
Interview questions
- Why does depending on interfaces instead of concrete classes make code easier to test?
Study resources
- Dependency Injection Explained (Article) — Baeldung's clear explanation of the dependency injection principle underlying Spring.
- Dependency Injection Explained (Video) — A conceptual explanation of why depending on abstractions makes code easier to test.
Part of
- Object-Oriented Design & Design Patterns — section
- Java + Spring Boot roadmap — the full learning path