java - Parsing dynamic JSON data with Gson -

i'm beginner java , gson user , have been able apply needs. have json data need parse spinner follows:

{     "lang":[         "arabic",         "bengali",         "dutch-utf8",         "eng_root",         "english",         "english-utf8",         ...      ],      "themes":{          "blue":{              "chinese_ibm500":1,              "spanish":1,              "bengali":1,              "japanese":1,              "english":1,              "russian":1,              "french-utf8":1,              "eng_root":1,              "arabic":1,              "spanish-utf8":1,              "portuguese":1,              ...          },          "green":{              "eng_root":1,              "engmonsoon":1,              "english":1              ...          },          "red":{              "chinese_ibm500":1,              "spanish":1,              "bengali":1,              ...          }     }   } 

so json need 2 things:

1) array under lang dynamic languages installed on server. how entries?

i have class follows im stuck should after return lang

public class listdata {      private list<language> lang;      public list<language> getlang {         return lang;     }      public static class language {         ???     } } 

2) after understanding 1 might able figure 1 out. under themes colors again can more or less {purple, orange, whatever}. need list of themes, far i'm concerned don't need know languages each.

feel question turning book. have searched extensively , hate asking questions i'm pretty stumped. in advance.

1) in order "lang" array, modify

private list<language> lang; 

for

private list<string> lang; 

since elements inside "lang" array strings, don't need class language store values, they'll parsed correctly strings. , doesn't matter how many strings array contains...

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2) in order parse "themes", have notice it's not array [ ], object { }, need parse object, , suitable class here map this:

private map<string, object> themes; 

note: said don't need data under "blue", "green", etc... can object value type in map, otherwise you'd need class...

using map here allows have arbitrary number of themes in json response.

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so in summary, need class like:

public class listdata {      private list<string> lang;     private map<string, object> themes;      //getters & setters } 

and parse json with:

gson gson = new gson(); listdata data = gson.fromjson(yourjsonstring, listdata.class); 

your list of langs under:

data.getlang(); 

and list of themes under:

data.getthemes().keyset(); 

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i suggest take @ gson documentation. it's quite short , clear , you'll understand better...