Controllers does not show when i use them in URL

In the Docs in this page

https://codeigniter.com/user_guide/incom...llers.html

the first example , i created the controller

PHP Code:

<?php namespace App\Controllers;

use CodeIgniter\Controller;

class Helloworld extends Controller
{
    public function index()
    {
        echo 'Hello World!';
    } 
} 


then i visited this URI 

https://localhost/www/igniterTest/public/helloworld

But what is get was this

   

a 404 page

So where is the problem ? is it possible to access controllers without going through routes first ?

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