Cities by Continent and Country

package SetsAndMaps;

import java.util.*;

public class CitiesByContinentAndCountry {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int number = Integer.parseInt(scanner.nextLine());

        Map<String, Map<String, List<String>>> nestedMap = new LinkedHashMap<>();

        for (int index = 0; index < number; index++) {
            String[] tokens = scanner.nextLine().split("\\s+");
            String continent = tokens[0];
            String country = tokens[1];
            String city = tokens[2];

            nestedMap.putIfAbsent(continent, new LinkedHashMap<>());

            if (nestedMap.containsKey(continent)) {
                nestedMap.get(continent).putIfAbsent(country, new ArrayList<>());

                if (nestedMap.get(continent).containsKey(country)) {
                    nestedMap.get(continent).get(country).add(city);
                }
            }
        }
        System.out.println();
        nestedMap.forEach((key, value) -> {

            System.out.printf("%s:%n",key);

            for (Map.Entry<String, List<String>> country : value.entrySet()) {
                System.out.printf("%s -> ", country.getKey());
                for (int i = 0; i < country.getValue().size(); i++) {
                    System.out.printf("%s", country.getValue().get(i));
                    if (i < country.getValue().size() - 1) {
                        System.out.print(", ");
                    }
                }
                System.out.println();
            }
        });
    }
}