How can I sort a JSONArray in JAVA [duplicate]

Question

How to sort a JSONArray of objects by object's field?

Input:

[     { "ID": "135", "Name": "Fargo Chan" },     { "ID": "432", "Name": "Aaron Luke" },     { "ID": "252", "Name": "Dilip Singh" } ]; 

Desired output (sorted by "Name" field):

[     { "ID": "432", "Name": "Aaron Luke" },     { "ID": "252", "Name": "Dilip Singh" }     { "ID": "135", "Name": "Fargo Chan" }, ]; 

Answer 1

Try this:

    //I assume that we need to create a JSONArray object from the following string     String jsonArrStr = "[ { \"ID\": \"135\", \"Name\": \"Fargo Chan\" },{ \"ID\": \"432\", \"Name\": \"Aaron Luke\" },{ \"ID\": \"252\", \"Name\": \"Dilip Singh\" }]";      JSONArray jsonArr = new JSONArray(jsonArrStr);     JSONArray sortedJsonArray = new JSONArray();      List<JSONObject> jsonValues = new ArrayList<JSONObject>();     for (int i = 0; i < jsonArr.length(); i++) {         jsonValues.add(jsonArr.getJSONObject(i));     }     Collections.sort( jsonValues, new Comparator<JSONObject>() {         //You can change "Name" with "ID" if you want to sort by ID         private static final String KEY_NAME = "Name";          @Override         public int compare(JSONObject a, JSONObject b) {             String valA = new String();             String valB = new String();              try {                 valA = (String) a.get(KEY_NAME);                 valB = (String) b.get(KEY_NAME);             }              catch (JSONException e) {                 //do something             }              return valA.compareTo(valB);             //if you want to change the sort order, simply use the following:             //return -valA.compareTo(valB);         }     });      for (int i = 0; i < jsonArr.length(); i++) {         sortedJsonArray.put(jsonValues.get(i));     } 

The sorted JSONArray is now stored in the sortedJsonArray object.