Add or Update Json field value

ReadStringToJsonNodeAndUpdateIt.java

package com.stanley;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectReader;

public class ReadStringToJsonNodeAndUpdateIt {

    public static void main(String[] args) {
        ObjectMapper mapper = new ObjectMapper();
        ObjectReader reader = mapper.reader();
        String jsonString = "{\"users\" : [{\"id\" : \"1\", \"name\" : \"stanley\", \"age\" : \"28\" }]}";
        try {
            JsonNode node = reader.readTree(jsonString);
            System.out.println(node.toString());
            ObjectNode objectNode = (ObjectNode) node;
            objectNode.put("gender", "male");
            System.out.println(node.toString());
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

is this json saving after updating?