How to remove duplicate and sort objects from JSONArray using Java

Question

My JSON is:

[
   {
      \"distance\":32,
      \"stationCode\":\"MIG\",
      \"name\":\"Midghat\",
      \"platforms\":\"2\"
   },
   {
      \"distance\":         


        

Answer 1

Here is the code for joining '2' JSONArrays and removing duplicates from the joined JSONArray, using ArrayList..contains() method:

    import java.util.ArrayList;
    import java.util.List;

    import org.json.JSONArray;
    import org.json.JSONException;
    import org.json.JSONObject;

    /**
     * @author RAM K K
     * @gmail kkram523@gmail.com
     * 
     */

public class JSONOperations {

    public static void main(String[] args) {

        String s3;

        String s1 = "[{\"name\": \"Bob\", \"car\": \"Ford\"},{\"name\": \"Steve\", \"car\": \"Mercedes Benz\"},{\"name\": \"Bob\", \"car\": \"Ford\"},{\"name\": \"Bob\", \"car\": \"Ford\"},{\"name\": \"Bob\", \"car\": \"Ford\"},{\"name\": \"Bob\", \"car\": \"Ford\"},{\"name\": \"Mary\", \"car\": \"Fiat\"}]";
        String s2 = "[{\"name\": \"Mack\", \"car\": \"VW\"},{\"name\": \"Steve\", \"car\": \"Mercedes Benz\"},{\"name\": \"Bob\", \"car\": \"Ford\"}]";
        try {
            JSONArray sourceArray = new JSONArray(s2);
            JSONArray destinationArray = new JSONArray(s1);

            System.out.println(sourceArray);
            System.out.println(destinationArray);

            for (int i = 0; i < sourceArray.length(); i++) {
                destinationArray.put(sourceArray.getJSONObject(i));
            }

            System.out.println(destinationArray);
            System.out.println("JSONArray Size is: " + destinationArray.length());
            List list = new ArrayList();
            for (int i = 0; i < destinationArray.length(); i++) {
                if (!list.contains(destinationArray.get(i).toString())) {
                    list.add(destinationArray.get(i).toString());
                }
            }

            System.out.println("LIST: " + list);
            System.out.println("LIST Size: " + list.size());

            JSONArray distinctJSONArray = new JSONArray(list.toString());
            System.out.println(distinctJSONArray.length());
            for (int i = 0; i < distinctJSONArray.length(); i++) {
                JSONObject JSON = (JSONObject) distinctJSONArray.getJSONObject(i);
                System.out.println(JSON);
            }

            s1 = s1.substring(s1.indexOf("[") + 1, s1.lastIndexOf("]"));
            s2 = s2.substring(s2.indexOf("[") + 1, s2.lastIndexOf("]"));

            s3 = "[" + s1 + "," + s2 + "]";
            System.out.println(new JSONArray(s3));

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}