Android : HttpPost and HttpGet object to url so as to be able to use with Volley?

Volley gives us better efficiency, however it uses the "url"

JsonObjectRequest j = new JsonObjectRequest((int method, String url, JSONObject jsonRequest, Listener<JSONObject> listener, ErrorListener errorListener);

But if I have to use HttpPost or HttpGet object as I have to set Header and Entity etc. How can I do it while still using Volley.

HttpGet httpGet = new HttpGet(url);
httpGet.setHeader("String", "something" );
httpGet.setHeader("Content-Type","application/json");
...
httpPost.setEntity(new StringEntity("whatever"));

basically after these lines of code I get HttpPost / HttpGet object; is there a way to use this object in volley instead of using HttpClient to execute the request.

Or is there a some different way to set header etc and then use it with Volley.