ProfilePresenter.java

public void ProfilePresenter {
  private final ProfileInteractor interactor;
  private ProfileView view;
  
  public ProfilePresenter(ProfileInteractor interactor) {
    this.interactor = interactor.
  }
  
  public void attachView(ProfileView view) {
    this.view = view;
    fetchAndDisplay();
  }
  
  public void dettachView() {
    // Not covered by this example:
    // You should handle the subscription
  }
  
  public void fetchAndDisplay() {
    // Not covered by this example:
    // You should handle the subscription
    // You should also check if view is not null
    // You should also handle the onError
    interactor.getUserProfile().subscribe(userProfile -> view.display(userProfile));
  }
}