How can we sort a JSONArray in Java?

JavaJSONObject Oriented ProgrammingProgramming

The JSON is one of the widely used data-interchange formats and is a lightweight and language independent. A JSONArray can parse text from a String to produce a vector-like object and supports java.util.List interface. 

We can sort a JSONArray in the below example.

Example

import java.util.*;
import org.json.*;
public class SortJSONArrayTest {
   public static void main(String[] args) {
      String jsonStr = "[ { \"ID\": \"115\", \"Name\": \"Raja\" },{ \"ID\": \"120\", \"Name\": \"Jai\" },{ \"ID\": \"125\", \"Name\": \"Adithya\" }]";
      JSONArray jsonArray = new JSONArray(jsonStr);
      JSONArray sortedJsonArray = new JSONArray();
      List list = new ArrayList();
      for(int i = 0; i < jsonArray.length(); i++) {
         list.add(jsonArray.getJSONObject(i));
      }
      System.out.println("Before Sorted JSONArray: " + jsonArray);
      Collections.sort(list, new Comparator() {
         private static final String KEY_NAME = "Name";
         @Override
         public int compare(JSONObject a, JSONObject b) {
            String str1 = new String();
            String str2 = new String();
            try {
               str1 = (String)a.get(KEY_NAME);
               str2 = (String)b.get(KEY_NAME);
            } catch(JSONException e) {
               e.printStackTrace();
            }
            return str1.compareTo(str2);
         }
      });
      for(int i = 0; i < jsonArray.length(); i++) {
         sortedJsonArray.put(list.get(i));
      }
      System.out.println("Sorted JSON Array with Name: " + sortedJsonArray);
   }
}

Output

Before Sorted JSONArray:
[{"ID":"115","Name":"Raja"},
   {"ID":"120","Name":"Jai"},
   {"ID":"125","Name":"Adithya"}]
Sorted JSON Array with Name:
[{"ID":"125","Name":"Adithya"},
   {"ID":"120","Name":"Jai"},
   {"ID":"115","Name":"Raja"}]
raja
Published on 19-Sep-2019 14:11:01
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