Using Gson to convert Json into Java Object -

i working on project using steam web api. api returns data in json format , wanted make java program uses data. here following json format api:

{     "response": {         "players": [             {                 "steamid": "---",                 "communityvisibilitystate": 1,                 "profilestate": 1,                 "personaname": "---",                 "lastlogoff": 1429915502,                 "profileurl": "---",                 "avatar": "---",                 "avatarmedium": "---",                 "avatarfull": "---",                 "personastate": 0             }         ]      } } 

i using google's json api called gson , having trouble setting java classes can use fromjson() method.

from json data, know there array of players objects contain data. 1 thing confusing me outer tag called response. know have construct class representing players objects have create class represents response since encloses players?

as of right now, have file named response.java contains following:

public class response {      private arraylist<player> playersummaries = new arraylist<player>();      public string tostring() {         return playersummaries.get(0).tostring();     }  }   class player {     private string steamid;     private string personaname;       public string getsteamid() {         return steamid;     }      public void setsteamid(string newsteamid) {         steamid = newsteamid;     }      public string getpersonaname() {         return personaname;     }      public void setpersonaname(string name) {         personaname = name;     }      //rest of getters , setters omitted.      @override     public string tostring() {         return "<<" + "steamid=" + steamid + "\n" + "name=" + personaname + "\n" + ">>";     } } 

i included variables plan use. json data above contained in string called jsondata , testing in main method:

response response = gson.fromjson(jsondata, response.class);  system.out.println(response.getplayerat(0)); 

however, running gives me indexoutofboundsexception. seems if gson unable information , store object? shed light on problem having? curious know if have set classes correctly.

replace

private arraylist<player> playersummaries = new arraylist<player>(); 

with

private arraylist<player> players = new arraylist<player>(); 

gson uses reflection field should populate. in case looking whether have field named players not.

you not need instantiate field, gson you.

edit:

you need wrapper class around top-level object. so

class myobject {     public response response; }  myobject myobject = gson.fromjson(jsondata, myobject.class);