Parsing JSON Array within JSON Object

Question

I have some JSON with the following structure     source                 name   john   age  20                name   michael   age  25                name   sara    age  23                 I have named this JSON string as mainJSON  I m trying to access the elements  name  and  age  with the following Java code   JSONArray jsonMainArr   new JSONArray mainJSON getJSONArray  source     for  int i   0  i  lt  jsonMainArr length    i            line 2        JSONObject childJSONObject   jsonMainArr getJSONObject i        String name   childJSONObject getString  name         int age       childJSONObject getInt  age        I m being shown the following exception for line number 2    org json JSONException  JSONArray initial value should be a string or collection or array    Please guide me as to where I m making the mistake and how to rectify this

User · Answer

This could be an answer to your question     JSONArray msg1    JSONArray  json get  source    for int i   0  i  lt  msg1 length    i       String name   msg1 getString  name      int age       msg1 getInt  age

User · Answer

line 2 should be  for  int i   0  i  lt  jsonMainArr size    i            line 2     For line 3  I m having to do      JSONObject childJSONObject    JSONObject  new JSONParser   parse jsonMainArr get i  toString

User · Answer

mainJSON getJSONArray  source   returns a JSONArray  hence you can remove the new JSONArray   The JSONArray contructor with an object parameter expects it to be a Collection or Array  not JSONArray   Try this   JSONArray jsonMainArr   mainJSON getJSONArray  source

User · Answer

private static String readAll Reader rd  throws IOException       StringBuilder sb   new StringBuilder        int cp      while   cp   rd read       -1          sb append  char  cp             return sb toString          String jsonText   readAll inputofyourjsonstream    JSONObject json   new JSONObject jsonText    JSONArray arr   json getJSONArray  sources      Your arr would looks like                   id  1001           name   jhon                                        id  1002           name   jhon              You can use   arr getJSONObject index    to get the objects inside of the array

User · Answer

Your code is fine  just replace the following line   JSONArray jsonMainArr   new JSONArray mainJSON getJSONArray  source       with this line   JSONArray jsonMainArr   mainJSON getJSONArray  source

[java] Parsing JSON Array within JSON Object

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