P8_Company Users_Maps_Ex

package ex1_MapsLambdaStreamAPI_13March2019;

import java.util.*;

public class P8_CompanyUsers {
    public static void main(String[] args) {
        @SuppressWarnings("resource")

        Scanner sc = new Scanner(System.in);

        Map<String, List<String>> companyUser = new TreeMap<>();

        String line = "";

        while (!"End".equals(line = sc.nextLine())) {
            String input = line;
            String[] data = input.split(" -> ");
            String company = data[0];
            String userID = data[1];

            if (!companyUser.containsKey(company)) {
                companyUser.put(company, new ArrayList<>());
                companyUser.get(company).add(userID);
            } else {
                if (!companyUser.get(company).contains(userID)) {
                    companyUser.get(company).add(userID);
                }
            }
        }

        companyUser.entrySet().stream().forEach(kvp -> {
            System.out.println(kvp.getKey());
            for (String id : kvp.getValue()) {
                System.out.println(String.format("-- %s", id));
            }
        });
    }
}