android studio Custom ListView with Checkbox

i am working with custom listview with checkbox , so i did everything well , but now i am stuck in some point , my question is how to handle with the checked elements and how i get theire position

my mainActivity:

public class MainActivity extends AppCompatActivity{

ListView listView;
ArrayAdapter<Universities> adapter;
Button btn_done;


public static ArrayList<Universities> listOfuniversities ;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


   listOfuniversities = new ArrayList<Universities>(50);


   addUnivs(1); //this fuction add items on my list view

    listView = findViewById(R.id.myListView);

    adapter = new UniversityAdapter(this  ,listOfuniversities);




    listView.setAdapter(adapter);

    btn_done = findViewById(R.id.btndone);

    }

my array adapter :

public class UniversityAdapter extends ArrayAdapter<Universities> {


CheckBox mycheck_box;



Context context;
ArrayList<Universities> Univerisyyy;

TextView nom_uv , state_uv , spec_uv , req_rate_uv , duration_uv , reputation_uv , joboffers_uv
        , sholarchip_uv  , cost_uv;



String nom_univ ="--", satae_univ ="--", speciality_univ ="--",RequiredRate_univ ="--"
        , Duration_of_study_univ  ="--", Reputation_univ="--" ,JobOffers_univ="--"
        , Scholarshipoffers_univ="--";
float  Cost_univ = 1;

Universities myUniversity;

UniversityAdapter(Context context ,  ArrayList<Universities> Univerisyyy){
    super(context ,0, Univerisyyy );
    this.context = context;
    this.Univerisyyy= Univerisyyy;
}


Context mContext = context;







@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

    View listItemView = LayoutInflater.from(getContext()).inflate(R.layout.row , parent , false);

   myUniversity =  getItem(position);

   
    nom_univ = myUniversity.nom_univ;
    satae_univ = myUniversity.satae_univ;
    speciality_univ = myUniversity.speciality_univ;
    RequiredRate_univ = myUniversity.RequiredRate_univ;
    Duration_of_study_univ = myUniversity.Duration_of_study_univ;
    Reputation_univ = myUniversity.Reputation_univ;
    JobOffers_univ = myUniversity.JobOffers_univ;
    Scholarshipoffers_univ = myUniversity.Scholarshipoffers_univ;
    Cost_univ = myUniversity.Cost_univ;



 

    nom_uv = listItemView.findViewById(R.id.Name_univ);
    nom_uv.setText(nom_univ);

    state_uv = listItemView.findViewById(R.id.state_univ);
    state_uv.setText(satae_univ);


    spec_uv = listItemView.findViewById(R.id.Speciality_univ);
    spec_uv.setText(speciality_univ);

    req_rate_uv = listItemView.findViewById(R.id.Required_Rate_univ);
    req_rate_uv.setText(RequiredRate_univ);


    duration_uv = listItemView.findViewById(R.id.Duration_of_study_univ);
    duration_uv.setText(Duration_of_study_univ);


    cost_uv = listItemView.findViewById(R.id.Cost_univ);
    String c = String.valueOf(Cost_univ);
    cost_uv.setText(c);


    reputation_uv = listItemView.findViewById(R.id.Reputation_univ);
    reputation_uv.setText(Reputation_univ);


    joboffers_uv = listItemView.findViewById(R.id.Job_Offers_univ);
    joboffers_uv.setText(JobOffers_univ);




    sholarchip_uv = listItemView.findViewById(R.id.Scholarship_offers_univ);
    sholarchip_uv.setText(Scholarshipoffers_univ);


    mycheck_box = listItemView.findViewById(R.id.checkbox_univ);
    //this is mycheck box
  



 return listItemView;

} }

and, Is there a way to collect the check elements in Arraylist which contain their position ?