import java.util.HashMap;

import java.util.Scanner;

/**

* Created by alex on 07/12/2016.

*/

public class UserManager {

/**

* Singleton

*/

private static UserManager userManager = new UserManager();

private UserManager() {

}

public static UserManager getInstance() {

return userManager;

}

private static HashMap<Integer, User> users = new HashMap<>();

private static int currentId = 0;

public int countUsers() {

return users.size();

}

public void addUser() {

Scanner scanner = new Scanner(System.in);

System.out.print("Enter username for new user: ");

String userName = scanner.nextLine();

User user = new User(userName);

users.put(currentId, user);

System.out.println("Added new user " + userName);

currentId++;

}

public User getUserById(Integer id) {

return users.get(id);

}

public void printAllUsers() {

users.forEach((k,v) -> {

System.out.println("[" + k + "]" + " \t " + v);

});

}

}