Spring Boot Dependency Injection Mock Test

Question 1: CORE SPRING BOOT - Dependency Injection Concept

What is the main purpose of Dependency Injection (DI) in Spring Boot?

Question 2: CORE SPRING BOOT - Constructor Injection

Which of the following best describes constructor-based dependency injection?

Question 3: CORE SPRING BOOT - Setter Injection

Which of the following best describes setter-based dependency injection?

Question 4: CORE SPRING BOOT - Field Injection

What is a key drawback of field injection using @Autowired directly on fields?

Question 5: CORE SPRING BOOT - Constructor Injection Example

What will happen when this Spring Boot code runs?

@Component
public class ServiceA {}

@Component
public class ServiceB {
    private final ServiceA serviceA;

    @Autowired
    public ServiceB(ServiceA serviceA) {
        this.serviceA = serviceA;
    }
}

Question 6: CORE SPRING BOOT - Setter Injection Example

In the following code, how is ServiceA injected into ServiceB?

@Component
public class ServiceA {}

@Component
public class ServiceB {
    private ServiceA serviceA;

    @Autowired
    public void setServiceA(ServiceA serviceA) {
        this.serviceA = serviceA;
    }
}

Question 7: CORE SPRING BOOT - Field Injection Example

Identify the injection type in the following code:

@Component
public class ServiceA {}

@Component
public class ServiceB {
    @Autowired
    private ServiceA serviceA;
}

Question 8: CORE SPRING BOOT - Benefits of Constructor Injection

Which of the following is a key advantage of constructor injection over setter or field injection?

Question 9: CORE SPRING BOOT - Optional Dependencies

How can you mark a dependency as optional in Spring Boot DI?

Question 10: CORE SPRING BOOT - Circular Dependency Handling

Which DI type is least prone to circular dependency issues in Spring Boot?