What components are included in the Dagger dependency injection framework?

The main components of Dagger are:

• @Module — a class that provides dependencies through methods annotated with @Provides.
• @Component — an interface that connects modules and dependency injection sites. It is responsible for generating code for injection.
• @Inject — an annotation used to mark constructors, fields, or methods where dependencies should be injected.
• @Scope — an annotation to define the scope of dependencies (e.g., Singleton).

Example:

@Module
class NetworkModule {
    @Provides
    Retrofit provideRetrofit() {
        return new Retrofit.Builder()...build();
    }
}

@Component(modules = NetworkModule.class)
interface AppComponent {
    void inject(MainActivity activity);
}

class MainActivity {
    @Inject Retrofit retrofit;

    void onCreate() {
        DaggerAppComponent.create().inject(this);
    }
}