Additional Notes
Why is constructor injection preferred for required dependencies?
Track: Java
Topic: Dependency Injection
Focus: Constructor vs Field Injection
Java: Constructor vs Field Injection
Answer
It makes collaborators visible and ensures the bean is valid when created.
Constructor injection forces the class to declare what it needs up front. That improves readability, supports immutability, and makes unit tests simpler because the object can be instantiated directly with mocks.
Constructor injection forces the class to declare what it needs up front. That improves readability, supports immutability, and makes unit tests simpler because the object can be instantiated directly with mocks.
Topics: Constructor vs Field Injection Dependency Injection Java