Spring Framework Spring Core & Dependency Injection

Question 1

Which Spring annotation is used to mark a class as a Spring-managed component?

Accepted Answer

@Component

Answer

@Component is the generic stereotype annotation that marks a class as a Spring-managed bean eligible for component scanning.

Question 2

What is the default bean scope in Spring Framework?

Accepted Answer

singleton

Answer

By default, Spring beans are singletons, meaning the IoC container creates exactly one instance of the bean per Spring container.

Question 3

Which annotation is used to inject dependencies in Spring?

Accepted Answer

@Autowired

Answer

@Autowired is Spring's annotation for automatic dependency injection by type into fields, constructors, or setter methods.

Question 4

What does the @Configuration annotation indicate in Spring?

Accepted Answer

The class is a source of bean definitions

Answer

@Configuration marks a class as a source of bean definitions, allowing @Bean methods to be declared inside it for the Spring IoC container.

Question 5

In Spring, what is the difference between constructor injection and setter injection?

Accepted Answer

Constructor injection enforces mandatory dependencies at creation time; setter injection allows optional wiring

Answer

Constructor injection makes dependencies mandatory and supports immutability, while setter injection is used for optional dependencies that can be changed after object creation.

Spring Framework Practice Test

Spring Framework Practice Test

Spring Framework Spring Core & Dependency Injection