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Hackrank test sample api consumption java code sample


import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.*;

import java.util.regex.Matcher;

import java.util.regex.Pattern;


public class TransactionFetcher {


    public static List<double[]> getTransaction(int locationId, String txnType) {

        int page = 1;

        List<double[]> transactions = new ArrayList<>();


        while (true) {

            try {

                String urlString = "https://jsonmock.hackerrank.com/api/transactions/search?" +

                        "txnType=" + txnType + "&page=" + page;

                URL url = new URL(urlString);

                HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                connection.setRequestMethod("GET");


                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));

                String inputLine;

                StringBuilder content = new StringBuilder();


                while ((inputLine = in.readLine()) != null) {

                    content.append(inputLine);

                }


                in.close();

                connection.disconnect();


                // Convert the response to JSON object

                Map<String, Object> response = new Gson().fromJson(content.toString(), Map.class);


                int totalPages = ((Double) response.get("total_pages")).intValue();

                List<Map<String, Object>> data = (List<Map<String, Object>>) response.get("data");


                for (Map<String, Object> value : data) {

                    Map<String, Object> location = (Map<String, Object>) value.get("location");

                    if (((Double) location.get("id")).intValue() == locationId) {

                        int userId = ((Double) value.get("userId")).intValue();


                        // Removing any non-numeric characters from the amount string

                        String amountString = (String) value.get("amount");

                        Pattern pattern = Pattern.compile("[^0-9.]");

                        Matcher matcher = pattern.matcher(amountString);

                        String amountCleaned = matcher.replaceAll("");

                        double amount = Double.parseDouble(amountCleaned);

                        amount = Math.round(amount * 100.0) / 100.0;


                        boolean found = false;

                        for (double[] transaction : transactions) {

                            if (transaction[0] == userId) {

                                transaction[1] += amount;

                                found = true;

                                break;

                            }

                        }


                        if (!found) {

                            transactions.add(new double[]{userId, amount});

                        }

                    }

                }


                if (page >= totalPages) {

                    break;

                }


                page++;

            } catch (Exception e) {

                e.printStackTrace();

            }

        }


        if (transactions.isEmpty()) {

            return Arrays.asList(new double[]{-1, -1});

        }


        transactions.sort(Comparator.comparingDouble(a -> a[0]));


        return transactions;

    }


    public static void main(String[] args) {

        List<double[]> result = getTransaction(1, "debit");


        for (double[] transaction : result) {

            System.out.println("UserId: " + (int) transaction[0] + ", Amount: " + transaction[1]);

        }

    }

}


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