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A User service which we rest enable from the
public class UserService {
    // use a tree map so they become sorted
    private final Map<StringUserusers = new TreeMap<StringUser>();
    public UserService() {
        .put("123"new User(123, "John Doe"));
        .put("456"new User(456, "Donald Duck"));

Gets a user by the given id

id the id of the user
the user, or null if no user exists
    public User getUser(String id) {
        return .get(id);

List all users

the list of all users
    public Collection<UserlistUsers() {
        return .values();

Updates or creates the given user

user the user
    public void updateUser(User user) {
        .put("" + user.getId(), user);
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