كيف أستدعي مصفوفةـ json بال java؟

أنا مبتدئ في تعلّم أندرويد كنت أتابع هذا الدرس حيث استخدم كود json من غير عنوان
كود json:

[
    {
        "title": "Dawn of the Planet of the Apes",
        "image": "http://api.androidhive.info/json/movies/1.jpg",
        "rating": 8.3,
        "releaseYear": 2014,
        "genre": ["Action", "Drama", "Sci-Fi"]
    },
    ....
    ....
]

كود الجافا الأساسي الذي تُستدعى المصفوفة منه:

package info.androidhive.customlistviewvolley;
 
import info.androidhive.customlistviewvolley.adater.CustomListAdapter;
import info.androidhive.customlistviewvolley.app.AppController;
import info.androidhive.customlistviewvolley.model.Movie;
 
import java.util.ArrayList;
import java.util.List;
 
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
 
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.ListView;
 
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
 
public class MainActivity extends Activity {
    // Log tag
    private static final String TAG = MainActivity.class.getSimpleName();
 
    // Movies json url
    private static final String url = "http://api.androidhive.info/json/movies.json";
    private ProgressDialog pDialog;
    private List<Movie> movieList = new ArrayList<Movie>();
    private ListView listView;
    private CustomListAdapter adapter;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        listView = (ListView) findViewById(R.id.list);
        adapter = new CustomListAdapter(this, movieList);
        listView.setAdapter(adapter);
 
        pDialog = new ProgressDialog(this);
        // Showing progress dialog before making http request
        pDialog.setMessage("Loading...");
        pDialog.show();
 
        // changing action bar color
        getActionBar().setBackgroundDrawable(
                new ColorDrawable(Color.parseColor("#1b1b1b")));
 
        // Creating volley request obj
        JsonArrayRequest movieReq = new JsonArrayRequest(url,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d(TAG, response.toString());
                        hidePDialog();
 
                        // Parsing json
                        for (int i = 0; i < response.length(); i++) {
                            try {
 
                                JSONObject obj = response.getJSONObject(i);
                                Movie movie = new Movie();
                                movie.setTitle(obj.getString("title"));
                                movie.setThumbnailUrl(obj.getString("image"));
                                movie.setRating(((Number) obj.get("rating"))
                                        .doubleValue());
                                movie.setYear(obj.getInt("releaseYear"));
 
                                // Genre is json array
                                JSONArray genreArry = obj.getJSONArray("genre");
                                ArrayList<String> genre = new ArrayList<String>();
                                for (int j = 0; j < genreArry.length(); j++) {
                                    genre.add((String) genreArry.get(j));
                                }
                                movie.setGenre(genre);
 
                                // adding movie to movies array
                                movieList.add(movie);
 
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
 
                        }
 
                        // notifying list adapter about data changes
                        // so that it renders the list view with updated data
                        adapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        VolleyLog.d(TAG, "Error: " + error.getMessage());
                        hidePDialog();
 
                    }
                });
 
        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(movieReq);
    }
 
    @Override
    public void onDestroy() {
        super.onDestroy();
        hidePDialog();
    }
 
    private void hidePDialog() {
        if (pDialog != null) {
            pDialog.dismiss();
            pDialog = null;
        }
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}

سؤالي: لو عندي كود json مشابهة لما سبق بعنوان "worldpopulation" ما الذي يُفترض بي تغييره في كود الجافا كي يتوافق مع كود json؟

{ 
"worldpopulation": 
	[
		 {
		 "rank":1,"country":"China",
		 "population":"1,354,040,000",
		 "flag":"http://www.androidbegin.com/tutorial/flag/china.png"
		 }
]

حاولت أعدّل في الكود لكن بدون نتيجة

 try {
                                jsonarray = new JSONArray("worldpopulation");
                                for (int i = 0; i < jsonarray.length(); i++) {
                                    JSONObject jsonobject = jsonarray.getJSONObject(i);
                                    Movie movie = new Movie();
                                    String name = jsonobject.getString("country");
                                    String url = jsonobject.getString("flag");
                                    movie.setTitle(name);
                                    movie.setThumbnailUrl(url);
                                    movieList.add(movie);
                                }
                            } catch (JSONException e) {
                                e.printStackTrace();

                            }
                        }
                        else {
                            Log.e("ServiceHandler", "No data received from HTTP request");

                        }