ArgumentCaptor vs doAnswer

ArgumentCaptor

ArgumentCaptor<UserChangedCallBack> userCapture = ArgumentCaptor.forClass(UserChangedCallBack.class);
doNothing().when(dialogBoxPresenter).showDialog(any(User.class), userCapture.capture());

usersListPresenter.onAddButtonClicked();

userCapture.getValue().onChanged(user);

doAnswer

doAnswer(new Answer() {
    @Override
    public Void answer(InvocationOnMock invocationOnMock) throws Throwable {
        UserChangedCallBack callBack = (UserChangedCallBack) invocationOnMock.getArguments()[1];
        callBack.onChanged(userForDeleting);
        return null;
    }
}).when(dialogBoxPresenter).showDialog(any(User.class), any(UserChangedCallBack.class));

usersListPresenter.onAddButtonClicked();