…

        // Example list of Ric to delete
        ArrayList<String> ricToDelete = new ArrayList<String>();
        ricToDelete.add("AAPL.O");
        ricToDelete.add("IBM.N");
        ricToDelete.add("FCHA.MI");
        ArrayList<String> instrumentListItemKeys = new ArrayList<String>();
        
        // Obtain the list of InstrumentListItemKey from the list of Ric
        instrumentListItemKeys = dss2.getInstrumentListItemKeys_AllInstruments(myListId2, ricToDelete);
        promptEnterKey();
        
                
        //* Delete the list of InstrumentsListItemKey from the list id
        if(instrumentListItemKeys!=null && instrumentListItemKeys.size()>0) {
           dss2.deleteInstrumentsFromList(myListId2,instrumentListItemKeys);            
        }





    public ArrayList<String> getInstrumentListItemKeys_AllInstruments(String listID, ArrayList<String> ricToDelete) {

       
       ArrayList<String> instrumentListItemKeys=new ArrayList<String>();
       
        try {
             
                    
            String urlGet = urlHost + "/Extractions/InstrumentLists('" + listID + "')/ThomsonReuters.Dss.Api.Extractions.InstrumentListGetAllInstruments";

            HttpGet request = new HttpGet(urlGet);
            request.addHeader("Authorization", "Token "+sessionToken);

            HttpResponse response = httpclient.execute(request);

            System.out.println("Get all instruments. HTTP status: " 
                + response.getStatusLine().getStatusCode());

            BufferedReader rd = new BufferedReader(
                new InputStreamReader(response.getEntity().getContent()));

            StringBuffer result = new StringBuffer();
            String line = "";
            while ((line = rd.readLine()) != null) {
                result.append(line);
            }

            System.out.println("JSON results received:\n"+result);

            JSONObject jsonGetResponse = new JSONObject(result.toString());

            String userDetail = jsonGetResponse.get("value").toString();
            System.out.println("All Instruments: " +userDetail);
            
            
            JSONArray valueJArray = jsonGetResponse.getJSONArray("value");

            for (int j = 0; j < ricToDelete.size(); j++) {
                   for (int i = 0; i < valueJArray.length(); i++){
                   

                   if( valueJArray.getJSONObject(i).getString("IdentifierType").equalsIgnoreCase("Ric") && valueJArray.getJSONObject(i).getString("Identifier").equals(ricToDelete.get(j)) ) {
                          instrumentListItemKeys.add(valueJArray.getJSONObject(i).getString("InstrumentListItemKey"));
                           System.out.println("\nFind Ric "+ricToDelete.get(j)+" . InstrumenListItemKeys: "+valueJArray.getJSONObject(i).getString("InstrumentListItemKey"));  
                           break;
                   }                      
                         
                   }
             }
            
            

        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        return instrumentListItemKeys;
        
    }





    public void deleteInstrumentsFromList(String listId, ArrayList<String> instrumentListItemKeys) {

        try {
            HttpPost httppost = new HttpPost(urlHost + "/Extractions/InstrumentLists('"+listId+"')/ThomsonReuters.Dss.Api.Extractions.InstrumentListDeleteItemsById");

            httppost.addHeader("content-type", "application/json;odata.metadata=minimal");
            httppost.addHeader("Authorization", "Token " + sessionToken);

            //String instrumentKey = "VjF8MHgwNzQ4ZWUxYWY3YjZmNzRhfDU";

            
            JSONArray jsArray = new JSONArray();
               for (int j = 0; j < instrumentListItemKeys.size(); j++) {
                     jsArray.put(instrumentListItemKeys.get(j));
               }
               
                
           JSONOrderedObject instListJSONObject = new JSONOrderedObject()
                   .put("InstrumentListItemKeys", jsArray);           


            System.out.println("Instrument addition JSON request content:\n"+ instListJSONObject.toString());
            StringEntity requestBody = new StringEntity(instListJSONObject.toString());

            httppost.setEntity(requestBody);

            ResponseHandler<String> responseHandler = new BasicResponseHandler();


            HttpResponse response2 = httpclient.execute(httppost);
            
            
                for (int j = 0; j < instrumentListItemKeys.size(); j++) {
                     System.out.println("Deleting InstrumentListItemKey: "+ instrumentListItemKeys.get(j));
                }
                                  

            System.out.println("HTTP status: " 
                + response2.getStatusLine().getStatusCode());
            
            
          // It will receive response code 204 with no content
          if (response2.getStatusLine().getStatusCode() == 204){
              System.out.println("Delete InstrumentListItemKey  completed.");
          }
          else if (response2.getStatusLine().getStatusCode() == 404){
              System.out.println("InstrumentListItemKey not found.");
          }             
            
            

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }