How is class registration in the Spring container for dependency injection performed?

In Spring, class registration in the container for dependency injection is usually done using annotations. The main methods:

• The @Component annotation (and its specialized variants @Service, @Repository, @Controller) on a class — Spring will automatically detect such a class during package scanning (component scanning) and register it as a bean.
• Using a configuration class with the @Configuration annotation and a method annotated with @Bean, which returns an instance of the required class.

Example with @Component:

@Component
public class MyService {
    // service logic
}

Example with @Bean:

@Configuration
public class AppConfig {
    @Bean
    public MyService myService() {
        return new MyService();
    }
}

Thus, the Spring container manages the lifecycle of these objects and injects them where needed through autowiring (@Autowired).