java - How to Use JSON Accumulate Method With List? -

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I'm trying to code below .... 

  public string list tojsonString ( String keyName, list; styleAttribute & gt; attrs) {JSONObject json = new JSONObject (); Json.accumulate (keyName, attrs); Return json.toString (); }   
 But when I'm checking the  json  variable, something like this happens in empty values ​​ 
 
 {"MyKey": {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {}, {}, {}, {}, }, {}}}   
 And when I am checking the  attrs  variable, it has 22 element data. What am I doing wrong here? I'm just converting my list to a Jason object and saving the database. I am using  
  import net.sf.json.JSONArray; Import net sf.json.JSONException; Import net sf.json.JSONObject;    
 
 
 You can use the code below  
  Public String ListToJsonString (List & Style; Attribute) {JSONObject jObject = new JSONObject (); Try {JSONArray jArray = New JSONArray (); (MyClass myObject: attrs) {JSONObject styleJSON = New JSONObject (); StyleJSON.put ("name", myObject.getName ()); Stylejson.eput ("roll number", myObject.getRollNumber ()); JArray.add (styleJSON); } JObject.put ("keyName", jArray); } Hold (exception JSE) {} return jObject.toString (); }   
 This will solve your problem.

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