callAPI.txt

private void getStockPricesOnline(final String companyCode){

        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                String inputLine;
                String result;
                
                boolean successful = false;
                while(!successful){
                    try{
                        String url = "https://www.alphavantage.co/query?function=TIME_SERIES_DAILY&symbol="
                                +companyCode+
                                "&apikey=demo&outputsize=compact";
                        System.out.println(url);
                        URL api = new URL(url);
                        HttpURLConnection connection =(HttpURLConnection) api.openConnection();
                        connection.connect();

                        InputStreamReader streamReader = new InputStreamReader(connection.getInputStream());
                        BufferedReader reader = new BufferedReader(streamReader);
                        StringBuilder stringBuilder = new StringBuilder();

                        while((inputLine = reader.readLine()) != null){
                            stringBuilder.append(inputLine);
                        }

                        reader.close();
                        streamReader.close();

                        result = stringBuilder.toString();

                        JSONObject jsonObject = new JSONObject(result);

                    } catch (Exception ex){
                        ex.printStackTrace();
                    }
                }

            }
        });
        thread.start();
        try{
            thread.join();
        }catch (Exception ex){
            ex.printStackTrace();
        }
    }