diff --git a/src/main/java/io/codelex/assignments/restcountries/Country.java b/src/main/java/io/codelex/assignments/restcountries/Country.java new file mode 100644 index 0000000..eb1d7b1 --- /dev/null +++ b/src/main/java/io/codelex/assignments/restcountries/Country.java @@ -0,0 +1,72 @@ +package io.codelex.assignments.restcountries; + +import java.util.HashSet; +import java.util.Set; + +public class Country { + private final String name; + private String capital; + private int population; + private double area; + private Set currencies = new HashSet<>(); + + + public Country(String name) { + this.name = name; + } + + public String getName() { + return name; + } + + public String getCapital() { + return capital; + } + + public void setCapital(String capital) { + this.capital = capital; + } + + public int getPopulation() { + return population; + } + + public void setPopulation(int population) { + this.population = population; + } + + public double getArea() { + return area; + } + + public void setArea(double area) { + this.area = area; + } + + public Set getCurrencies() { + return currencies; + } + + public void addCurrency(Currency currency) { + currencies.add(currency); + } + + public double getDensity() { + if (getPopulation() != 0 && getArea() != 0) { + return (getPopulation() / getArea()); + } + return 0.0; + } + + @Override + public String toString() { + return "Country{" + + "name='" + name + '\'' + + ", capital='" + capital + '\'' + + ", population=" + population + + ", area=" + area + + ", currencies=" + currencies + + '}'; + } + +} diff --git a/src/main/java/io/codelex/assignments/restcountries/Currency.java b/src/main/java/io/codelex/assignments/restcountries/Currency.java new file mode 100644 index 0000000..45ea83a --- /dev/null +++ b/src/main/java/io/codelex/assignments/restcountries/Currency.java @@ -0,0 +1,61 @@ +package io.codelex.assignments.restcountries; + +import java.util.Objects; + +public class Currency { + private final String code; + private final String name; + private final String symbol; + + public Currency(String code, String name, String symbol) { + this.code = code; + this.name = name; + this.symbol = symbol; + } + + public String getCode() { + return code; + } + + public String getName() { + return name; + } + + public String getSymbol() { + return symbol; + } + + @Override + public String toString() { + return code + " \"" + name + "\" " + symbol; + } + + @Override + public boolean equals(Object o) { + if (this == o) { + return true; + } + if (o == null || getClass() != o.getClass()) { + return false; + } + + Currency currency = (Currency) o; + + if (!Objects.equals(code, currency.code)) { + return false; + } + if (!Objects.equals(name, currency.name)) { + return false; + } + return Objects.equals(symbol, currency.symbol); + } + + @Override + public int hashCode() { + int result = code != null ? code.hashCode() : 0; + result = 31 * result + (name != null ? name.hashCode() : 0); + result = 31 * result + (symbol != null ? symbol.hashCode() : 0); + return result; + } + +} diff --git a/src/main/java/io/codelex/assignments/restcountries/README.md b/src/main/java/io/codelex/assignments/restcountries/README.md new file mode 100644 index 0000000..4554555 --- /dev/null +++ b/src/main/java/io/codelex/assignments/restcountries/README.md @@ -0,0 +1,24 @@ +## Task +--- +
+

1. Using restcountries.eu create a text data file in JSON format, containing only the +following data about countries in the European Union: name, capital, currencies, population, +area.

+
+

2. Read and process this file with your java program to get the following results:
+

    +
  1. top 10 countries with the biggest population
    2. +
  2. top 10 countries with the biggest area
    3. +
  3. top 10 countries with the biggest population density (people / square km)


+

3a. Add the ability to consume the data about countries directly from the restcountries.eu and +process it (keep the code that processes data from the text file as well!)
+3b. Convert your application to Spring Boot application and expose results via REST API

+4. Add unit tests

+Additional info:
+1. and 2. are mandatory.
+3a. and 3b. are very good to have, can be done in any order
+4. is optional, but nice to have. do not be shy to try :)

+Deliverables:
+1. source code
+2. description how to run your program - i.e. how do you run it yourself. it might be using IDE, or +a using command line, whatever works diff --git a/src/main/java/io/codelex/assignments/restcountries/RestCountries.java b/src/main/java/io/codelex/assignments/restcountries/RestCountries.java new file mode 100644 index 0000000..6b76d5a --- /dev/null +++ b/src/main/java/io/codelex/assignments/restcountries/RestCountries.java @@ -0,0 +1,104 @@ +package io.codelex.assignments.restcountries; + +import org.json.JSONArray; +import org.json.JSONObject; + +import java.io.BufferedReader; +import java.io.IOException; +import java.io.InputStreamReader; +import java.net.HttpURLConnection; +import java.net.URL; +import java.nio.file.Files; +import java.nio.file.Path; +import java.util.ArrayList; +import java.util.Comparator; +import java.util.List; + +public class RestCountries { + public static void main(String[] args) throws IOException { + String jsonData = getRestCountriesJsonData(); + List countries = parseRestCountriesJsonData(jsonData); + + System.out.println("Top 10 by population:"); + List top10pop = countries.stream() + .sorted(Comparator.comparing(Country::getPopulation).reversed()) + .limit(10L) + .toList(); + top10pop.forEach(System.out::println); + + System.out.println(); + System.out.println("Top 10 by area:"); + List top10area = countries.stream() + .filter(country -> country.getArea() != 0) + .sorted(Comparator.comparing(Country::getArea).reversed()) + .limit(10L) + .toList(); + top10area.forEach(System.out::println); + + System.out.println(); + System.out.println("Top 10 by density"); + List top10density = countries.stream() + .filter(country -> country.getDensity() != 0.0) + .sorted(Comparator.comparing(Country::getDensity).reversed()) + .limit(10L) + .toList(); + top10density.forEach(System.out::println); + + System.out.println(); + System.out.println("Listing all Countries"); + countries.forEach(System.out::println); + } + + private static String getLocalRestCountriesJsonData() throws IOException { + Path fileName = Path.of(Country.class.getResource("eu-countries.json").getPath()); + return Files.readString(fileName); + } + + private static String getRestCountriesJsonData() { + try { + URL url = new URL("https://restcountries.com/v2/regionalbloc/eu?fields=name,capital,currencies,population,area"); + HttpURLConnection connection = (HttpURLConnection) url.openConnection(); + connection.setRequestMethod("GET"); + connection.connect(); + int responseCode = connection.getResponseCode(); + if (responseCode != 200) { + throw new RuntimeException("HttpResponseCode: " + responseCode); + } else { + StringBuilder builder = new StringBuilder(); + BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream())); + String inputLine; + while ((inputLine = reader.readLine()) != null) { + builder.append(inputLine); + } + return builder.toString(); + } + } catch (Exception e) { + throw new RuntimeException(e.getMessage()); + } + } + + private static List parseRestCountriesJsonData(String jsonData) { + List countries = new ArrayList<>(); + JSONArray jsonArr = new JSONArray(jsonData); + for (Object countryObj : jsonArr) { + JSONObject countryJson = (JSONObject) countryObj; + Country country = new Country(countryJson.getString("name")); + country.setCapital(countryJson.getString("capital")); + country.setPopulation(countryJson.getInt("population")); + if (countryJson.has("area")) { + country.setArea(countryJson.getDouble("area")); + } + for (Object currencyObj : countryJson.getJSONArray("currencies")) { + JSONObject currencyJson = (JSONObject) currencyObj; + String code = currencyJson.getString("code"); + String name = currencyJson.getString("name"); + String symbol = currencyJson.getString("symbol"); + Currency currency = new Currency(code, name, symbol); + country.addCurrency(currency); + } + countries.add(country); + } + return countries; + } + +} diff --git a/src/main/resources/io/codelex/assignments/restcountries/eu-countries.json b/src/main/resources/io/codelex/assignments/restcountries/eu-countries.json new file mode 100644 index 0000000..53f6994 --- /dev/null +++ b/src/main/resources/io/codelex/assignments/restcountries/eu-countries.json @@ -0,0 +1,440 @@ +[ + { + "name": "Åland Islands", + "capital": "Mariehamn", + "population": 28875, + "area": 1580.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Austria", + "capital": "Vienna", + "population": 8917205, + "area": 83871.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Belgium", + "capital": "Brussels", + "population": 11555997, + "area": 30528.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Bulgaria", + "capital": "Sofia", + "population": 6927288, + "area": 110879.0, + "currencies": [ + { + "code": "BGN", + "name": "Bulgarian lev", + "symbol": "лв" + } + ], + "independent": false + }, + { + "name": "Croatia", + "capital": "Zagreb", + "population": 4047200, + "area": 56594.0, + "currencies": [ + { + "code": "HRK", + "name": "Croatian kuna", + "symbol": "kn" + } + ], + "independent": false + }, + { + "name": "Cyprus", + "capital": "Nicosia", + "population": 1207361, + "area": 9251.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Czech Republic", + "capital": "Prague", + "population": 10698896, + "area": 78865.0, + "currencies": [ + { + "code": "CZK", + "name": "Czech koruna", + "symbol": "Kč" + } + ], + "independent": false + }, + { + "name": "Denmark", + "capital": "Copenhagen", + "population": 5831404, + "area": 43094.0, + "currencies": [ + { + "code": "DKK", + "name": "Danish krone", + "symbol": "kr" + } + ], + "independent": false + }, + { + "name": "Estonia", + "capital": "Tallinn", + "population": 1331057, + "area": 45227.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Finland", + "capital": "Helsinki", + "population": 5530719, + "area": 338424.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "France", + "capital": "Paris", + "population": 67391582, + "area": 640679.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "French Guiana", + "capital": "Cayenne", + "population": 254541, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Germany", + "capital": "Berlin", + "population": 83240525, + "area": 357114.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Gibraltar", + "capital": "Gibraltar", + "population": 33691, + "area": 6.0, + "currencies": [ + { + "code": "GIP", + "name": "Gibraltar pound", + "symbol": "£" + } + ], + "independent": false + }, + { + "name": "Greece", + "capital": "Athens", + "population": 10715549, + "area": 131990.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Hungary", + "capital": "Budapest", + "population": 9749763, + "area": 93028.0, + "currencies": [ + { + "code": "HUF", + "name": "Hungarian forint", + "symbol": "Ft" + } + ], + "independent": false + }, + { + "name": "Ireland", + "capital": "Dublin", + "population": 4994724, + "area": 70273.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Isle of Man", + "capital": "Douglas", + "population": 85032, + "area": 572.0, + "currencies": [ + { + "code": "GBP", + "name": "British pound", + "symbol": "£" + }, + { + "code": "IMP[G]", + "name": "Manx pound", + "symbol": "£" + } + ], + "independent": false + }, + { + "name": "Italy", + "capital": "Rome", + "population": 59554023, + "area": 301336.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Latvia", + "capital": "Riga", + "population": 1901548, + "area": 64559.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Lithuania", + "capital": "Vilnius", + "population": 2794700, + "area": 65300.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Luxembourg", + "capital": "Luxembourg", + "population": 632275, + "area": 2586.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Malta", + "capital": "Valletta", + "population": 525285, + "area": 316.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Netherlands", + "capital": "Amsterdam", + "population": 17441139, + "area": 41850.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Poland", + "capital": "Warsaw", + "population": 37950802, + "area": 312679.0, + "currencies": [ + { + "code": "PLN", + "name": "Polish złoty", + "symbol": "zł" + } + ], + "independent": false + }, + { + "name": "Portugal", + "capital": "Lisbon", + "population": 10305564, + "area": 92090.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Romania", + "capital": "Bucharest", + "population": 19286123, + "area": 238391.0, + "currencies": [ + { + "code": "RON", + "name": "Romanian leu", + "symbol": "lei" + } + ], + "independent": false + }, + { + "name": "Slovakia", + "capital": "Bratislava", + "population": 5458827, + "area": 49037.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Slovenia", + "capital": "Ljubljana", + "population": 2100126, + "area": 20273.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Spain", + "capital": "Madrid", + "population": 47351567, + "area": 505992.0, + "currencies": [ + { + "code": "EUR", + "name": "Euro", + "symbol": "€" + } + ], + "independent": false + }, + { + "name": "Sweden", + "capital": "Stockholm", + "population": 10353442, + "area": 450295.0, + "currencies": [ + { + "code": "SEK", + "name": "Swedish krona", + "symbol": "kr" + } + ], + "independent": false + } +]