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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.