How does RequestQueue works

Question

I've already know some of the inner workings of Volley network library.

            //Request a string response from the URL resource
            StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
                    new Response.Listener() {
                        @Override
                        public void onResponse(String response) {
                            // Display the response string.
                            txtView.setText("Response is: " + response.toString());
                        }
                    }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    txtView.setText("Oops! That didn’t work!");
                }
            });

            //Instantiate the RequestQueue and add the request to the queue
            RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
            queue.add(stringRequest);

I'm just wondering how does this 2 lines of codes work?

 RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
 queue.add(stringRequest);

It adds my request in the queue after StringRequest returns a request? and then the RequestQueue returns the result and throws it to the onResponse method?? is that the real flow?