public Optional<User> show(long userId)
    {
        return HTTP.GET(String.format("/v2/users/%d.json", userId), USER);
    }
public Optional < User > show ( long userId ) { return HTTP . GET ( String . format ( "/v2/users/%d.json" , userId ) , USER ) ; }
Returns the user for the given user id.
@param userId The id for the user to return
@return The user