Don't know how to assign array values ​​to another one?

Question

Java

Please explain, I have two arrays long[] id and String[] users,
The task is that I need to assign an ID to each user, so that later I can find it by it, thanks to
the User[] users field, which acts as a conditional base data.
In the class, write the
getUserNameById(long id) method - to get the username by its id

Answer 1

the logic of matching id and User is incomprehensible.
and so

HashMap <int,String>usersDict = new HashMap<int, String>();
i = 0;
for(String singleUser: users){

usersDict.put(id.get(i),singleUser);
i++;
}
Это создаст HashMap с ключами id - User.
Соответсвие будет по номеру элемента массива. Id(0) элемент массива, User(0) Элемент массива.

Answer 2

the User[] users field, which acts as a conditional database.
In the class, write the
getUserNameById(long id) method - to get the username, by its id
, there is only this

According to this description, you need something like this:

public User getUserNameById(long id) {
   for (User user : users) {
       if (id.equals(user.getId())) {
         return user;
       }
    }
   return null;
}