Why is constructor injection with @Autowired generally preferred over field injection in Spring Boot?

hard📝 Conceptual Q10 of 15

Spring Boot - Inversion of Control and Dependency Injection

Why is constructor injection with @Autowired generally preferred over field injection in Spring Boot?

AField injection requires public fields which is unsafe

BConstructor injection makes dependencies explicit and supports immutability

CConstructor injection is faster at runtime

DField injection does not work with @Component classes

Step-by-Step Solution

Solution:

Step 1: Compare constructor and field injection
Constructor injection requires dependencies to be passed in, making them clear and allowing final fields.
Step 2: Benefits of constructor injection
This approach supports immutability and easier testing, improving code quality.
Final Answer:
Constructor injection makes dependencies explicit and supports immutability -> Option B
Quick Check:
Constructor injection = explicit dependencies + immutability [OK]

Quick Trick: Constructor injection clarifies dependencies and allows final fields [OK]

Common Mistakes:

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