[Solved] You have a Spring Boot service class that uses field injection:public class OrderService { @Autowired private PaymentService... } }How would switching to constructor injection improve this class? | Spring Boot

Spring Boot - Inversion of Control and Dependency Injection

You have a Spring Boot service class that uses field injection:

public class OrderService {
  @Autowired
  private PaymentService paymentService;

  public boolean processOrder(Order order) {
    return paymentService.charge(order.getAmount());
  }
}

How would switching to constructor injection improve this class?

AIt makes dependencies explicit and improves testability

BIt removes the need to annotate fields with <code>@Autowired</code>

CIt automatically creates new instances of dependencies

DIt allows Spring to inject dependencies without a constructor

Step-by-Step Solution

Solution:

Step 1: Understand constructor injection benefits
Constructor injection requires dependencies to be passed in explicitly, making them visible and clear in the class design.
Step 2: Analyze testability improvements
Explicit dependencies allow easy replacement with mocks or stubs during testing, improving testability and code clarity.
Final Answer:
It makes dependencies explicit and improves testability -> Option A
Quick Check:
Constructor injection = explicit dependencies + better tests [OK]

Quick Trick: Constructor injection shows dependencies clearly, aiding tests [OK]

Common Mistakes:

Thinking constructor injection removes @Autowired completely
Believing constructor injection creates new instances automatically
Assuming Spring injects without constructor or annotations

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More Spring Boot Quizzes

You have a Spring Boot service class that uses field injection:

Step 1: Understand constructor injection benefits

Step 2: Analyze testability improvements

Final Answer:

Quick Check:

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