Additional Notes
Why use ‘final’ with constructor-injected dependencies?
Track: Java
Topic: Dependency Injection
Focus: Constructor vs Field Injection
Java: Constructor vs Field Injection
Answer
It enforces immutability of dependencies. Frame the concept in practical terms so you can explain it during interview discussion.
Marking dependencies as 'final' ensures they cannot be reassigned after object construction. This guarantees that the dependencies remain consistent throughout the object's lifecycle. In a PaymentProcessor class, marking its dependencies as 'final' means they cannot change, preventing unexpected behavior.
Marking dependencies as 'final' ensures they cannot be reassigned after object construction. This guarantees that the dependencies remain consistent throughout the object's lifecycle. In a PaymentProcessor class, marking its dependencies as 'final' means they cannot change, preventing unexpected behavior.
Topics: Constructor vs Field Injection Dependency Injection Java