Java Requires Chilkat v11.0.0+

Modify Parts of JSON Document

See more JSON Examples

Demonstrates how to modify parts of a JSON document. This example uses the following JSON document:

{
   "fruit": [
      	{
         "kind": "apple",
	 "count": 24,
	 "fresh": true,
	 "extraInfo": null,
	 "listA": [ "abc", 1, null, false ],
	 "objectB": { "animal" : "monkey" }
      	},
	{
         "kind": "pear",
	 "count": 18,
	 "fresh": false,
	 "extraInfo": null
	 "listA": [ "xyz", 24, null, true ],
	 "objectB": { "animal" : "lemur" }
	}
    ],
    "list" : [ "banana", 12, true, null, "orange", 12.5, { "ticker": "AAPL" }, [ 1, 2, 3, 4, 5 ] ],
    "alien" : true
}

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonArray;
import com.chilkatsoft.chilkat2.JsonObject;

public class ChilkatExample {

    public static void main(String[] args) {
        JsonObject json = new JsonObject();

        // Load the JSON from a file.
        try {
            json.loadFile("qa_data/json/modifySample.json");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // This example will not check for errors (i.e. null / false / 0 return values)...

        // Get the "list" array:

        JsonArray listA = new JsonArray();

        json.arrayOf2("list", listA);

        // Modify values in the list.

        // Change banana to plantain
        listA.setStringAt(0, "plantain");

        // Change 12 to 24
        listA.setIntAt(1, 24);

        // Change true to false
        listA.setBoolAt(2, false);

        // Is the 3rd item null?
        boolean bNull = listA.isNullAt(3);

        // Change "orange" to 32.
        listA.setIntAt(4, 32);

        // Change 12.5 to 31.2
        listA.setNumberAt(5, "31.2");

        // Replace the { "ticker" : "AAPL" } object with { "ticker" : "GOOG" }
        // Do this by deleting, then inserting a new object at the same location.
        listA.deleteAt(6);
        JsonObject tickerObj = new JsonObject();
        listA.addObjectAt2(6, tickerObj);

        tickerObj.appendString("ticker", "GOOG");

        // Replace "[ 1, 2, 3, 4, 5 ]" with "[ "apple", 22, true, null, 1080.25 ]"
        listA.deleteAt(7);
        JsonArray aa = new JsonArray();
        listA.addArrayAt2(7, aa);

        aa.addStringAt(-1, "apple");
        aa.addIntAt(-1, 22);
        aa.addBoolAt(-1, true);
        aa.addNullAt(-1);
        aa.addNumberAt(-1, "1080.25");

        // Get the "fruit" array
        JsonArray aFruit = new JsonArray();
        json.arrayAt2(0, aFruit);

        // Get the 1st element:
        JsonObject appleObj = new JsonObject();
        aFruit.objectAt2(0, appleObj);

        // Modify values by member name:
        appleObj.setStringOf("fruit", "fuji_apple");
        appleObj.setIntOf("count", 46);
        appleObj.setBoolOf("fresh", false);
        appleObj.setStringOf("extraInfo", "developed by growers at the Tohoku Research Station in Fujisaki");

        // Modify values by index:

        JsonObject pearObj = new JsonObject();
        aFruit.objectAt2(1, pearObj);

        pearObj.setStringAt(0, "bartlett_pear");
        pearObj.setIntAt(1, 12);
        pearObj.setBoolAt(2, false);
        pearObj.setStringAt(3, "harvested in late August to early September");

        json.setEmitCompact(false);
        System.out.println(json.emit());
    }
}