CODEWITHSUNDEEP
javajsonjson-lib
nikhilvora
nikhilvora

Reputation: 541

JSON Nested data creation failing in Java

import net.sf.json.*;

public class JSONDemo {

/**
 * @param args
 */
public static void main(String[] args) {
    JSONObject mainObj = new JSONObject();

    JSONObject jObj1 = new JSONObject();
    JSONObject jObj2 = new JSONObject();

    JSONArray jA1 = new JSONArray();        
    JSONArray jA2 = new JSONArray();

    JSONArray mainArray= new JSONArray();

    jObj1.accumulate("id", 17);
    jObj1.accumulate("name", "Alex");
    jObj1.accumulate("children", jA1);

    mainArray.add(jObj1);

    jObj2.accumulate("id", 94);
    jObj2.accumulate("name", "Steve");
    jObj2.accumulate("children", jA2);

    //Adding the new object to jObj1 via jA1

    jA1.add(jObj2);

    mainObj.accumulate("ccgs", mainArray);
    System.out.println(mainObj.toString());     
}    

}

The output I got is

{"ccgs":[{"id":17,"name":"Alex","children":[]}]}

I wanted the jObj2 within the children key of jObj1.

Upvotes: 1

Views: 1993

Answers (2)

Arnaud
Arnaud

Reputation: 7439

Apparently the node creation order has an impact on the generated string. If you change the object creation order, beginning with the children, the Json is correct.

See that code :

    public static void main(String[] args) {
        // first create the child node
        JSONObject jObj2 = new JSONObject();
        jObj2.accumulate("id", 94);
        jObj2.accumulate("name", "Steve");
        jObj2.accumulate("children", new JSONArray());

        // then create the parent's children array
        JSONArray jA1 = new JSONArray(); 
        jA1.add(jObj2);

        // then create the parent
        JSONObject jObj1 = new JSONObject();
        jObj1.accumulate("id", 17);
        jObj1.accumulate("name", "Alex");
        jObj1.accumulate("children", jA1);

        // then create the main array
        JSONArray mainArray = new JSONArray();
        mainArray.add(jObj1);

        // then create the main object
        JSONObject mainObj = new JSONObject();
        mainObj.accumulate("ccgs", mainArray);

        System.out.println(mainObj);    
    }

The output is :

{"ccgs":[{"id":17,"name":"Alex","children":[{"id":94,"name":"Steve","children":[]}]}]}

Upvotes: 2

Subir Kumar Sao
Subir Kumar Sao

Reputation: 8411

If you wanted something like this {"ccgs":[{"id":17,"name":"Alex","children":{"id":94,"name":"Steve","children":[]}}]}

Then you can do like this.

    JSONObject mainObj = new JSONObject();

    JSONObject jObj1 = new JSONObject();
    JSONObject jObj2 = new JSONObject();

    JSONArray jA1 = new JSONArray();        
    JSONArray jA2 = new JSONArray();

    JSONArray mainArray= new JSONArray();

    jObj2.accumulate("id", 94);
    jObj2.accumulate("name", "Steve");
    jObj2.accumulate("children", jA2);

    jObj1.accumulate("id", 17);
    jObj1.accumulate("name", "Alex");
    jObj1.accumulate("children", jObj2);

    mainArray.add(jObj1);



    //Adding the new object to jObj1 via jA1

    jA1.add(jObj2);

    mainObj.accumulate("ccgs", mainArray);
    System.out.println(mainObj.toString());

Upvotes: 0

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