What are the features of dependency injection using…

Dependency injection into fields (field injection) with Dagger has the following features:

@Inject is required for each field: Each field that needs dependency injection must be annotated with @Inject.

// Example:
class MyFragment extends Fragment {

    @Inject
    MyService myService; // Field for injection

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Injection occurs here
        ((MyApplication) requireActivity().getApplication()).getAppComponent().inject(this);
    }
}

Injection of the owner object is required: The class containing the fields for injection (e.g., Activity, Fragment) is not created directly by Dagger. It needs to be "injected" from the component. For this, a method inject() is added to the component that accepts an instance of this class.
```
// Example component:
@Component(modules = ...)
public interface AppComponent {
    void inject(MyFragment fragment); // Method for injection into MyFragment
    // ... other injection or dependency provision methods
}
```
Injection occurs after construction: Field injection happens after the object has been created. This means that in the constructor of this object, fields annotated with @Inject will not yet be initialized.
Limited testability: Testing classes with field injection can be more difficult, as creating an instance of the class and subsequent use requires running the injection process (via the component), rather than simply passing mocks through the constructor.
Potential for null fields in constructor: If you try to use fields annotated with @Inject in the constructor, they will be null, which can lead to a NullPointerException.
Usage in Activity/Fragment: Field injection is often used in Android components (Activity, Fragment, Service) because their lifecycle is managed by the framework, and conventional constructor injection can be inconvenient.
Less explicit: Unlike constructor injection, where all dependencies are clearly visible in the constructor signature, dependencies injected into fields are less obvious at first glance of the class.

Overall, field injection is convenient for Android components but has drawbacks in terms of clarity and testability compared to constructor injection.

What are the features of dependency injection using Dagger in the field?