Inbox Manager

package com.company;

import java.util.*;

public class products {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        HashMap<String, ArrayList> namesAndEmails = new HashMap<>();
        LinkedHashMap<String, Integer> usersCount = new LinkedHashMap<>();
        String line = scanner.nextLine();

        while (!"Statistics".equals(line)) {
            String[] tokens = line.split("->");
            String command = tokens[0];
            switch (command) {
                case "Add":
                   String userName = tokens[1];
                    if (namesAndEmails.containsKey(userName)) {
                        System.out.printf("%s is already registered%n", userName);
                    } else {
                        namesAndEmails.put(userName, new ArrayList());
                        usersCount.put(userName, 0);
                        int count = usersCount.get(userName) + 1;
                        usersCount.put(userName, count);
                    }
                    break;
                case "Send":
                    String username = tokens[1];
                    String eMail = tokens[2];
                    namesAndEmails.get(username).add(eMail);
                    break;
                case "Delete":
                    String user = tokens[1];
                    if (namesAndEmails.containsKey(user)) {
                        namesAndEmails.remove(user);
                    } else {
                        System.out.printf("%s not found!%n", user);
                    }
                    break;
            }

            line = scanner.nextLine();
        }usersCount.entrySet().forEach(entry ->System.out.println("Users count: " + entry.getValue()));

        namesAndEmails.entrySet().stream().sorted((f, s) -> {
            int sum = s.getValue().size() - f.getValue().size();
            if (sum == 0) {
                f.getKey().compareTo(s.getKey());
            }
            return sum;
        }).forEach(entry -> {
            System.out.println(entry.getKey());
            System.out.print("- ");

                System.out.printf(String.join( "- %n", entry.getValue()));

        });
    }
}