Junior — Middle
How can components be extracted from an inversion of control container?
sobes.tech AI
Answer from AI
Extraction of components from an inversion of control container (for example, Spring IoC Container) usually occurs through:
- Automatic dependency injection using annotations
@Autowired,@Inject, or through the constructor. - Explicitly obtaining a component from the container using the
getBean()method.
Example of obtaining a component from Spring ApplicationContext:
ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
MyService myService = context.getBean(MyService.class);
Or through automatic injection:
@Component
public class MyComponent {
private final MyService myService;
@Autowired
public MyComponent(MyService myService) {
this.myService = myService;
}
}
Thus, components are either retrieved automatically by the container or manually through the container's API.