How to construct a JSON object from a subset of another JSON object in Java?

The JSON stands for JavaScript Object Notation and it can be used to transfer and storage of data. The JSONObject can parse text from a String to produce a map-like object. We can also construct a JSON object from a subset of another JSON object using the JSONObject(JSONObject jo, java.lang.String[] names) constructor, an array of strings is used to identify the keys that can be copied and missing keys are ignored.

Syntax

public JSONObject(JSONObject jo, java.lang.String[] names)

Example

import java.util.*;
import org.json.*;
public class JSONSubsetTest {
   public static void main(String[] args) throws JSONException {
      Map<String, Object> map = new HashMap<String, Object>();
      map.put("Name", "Adithya");
      map.put("Age", 25);
      map.put("DOB", new Date(94, 4, 6));
      map.put("City", "Hyderabad");
      JSONObject obj = new JSONObject(map);
      System.out.println(obj.toString(2));
      JSONObject subset = new JSONObject(obj, new String [] {"Name", "Age"});
      System.out.println(subset.toString(2));
   }
}

Output

{
   "City": "Hyderabad",
   "DOB": "Fri May 06 00:00:00 IST 1994",
   "Age": 25,
   "Name": "Adithya"
}
{
   "Age": 25,
   "Name": "Adithya"
}

Raja

Published on 17-Sep-2019 14:30:13

• Related Questions & Answers
• How can we convert a JSON string to a JSON object in Java?
• How to create a JSON Object using Object Model in Java?
• How to return a json object from a Python function?
• How to convert a Map to JSON object using JSON-lib API in Java?
• Removing property from a JSON object in JavaScript
• How can we encode a JSON object in Java?
• How can we decode a JSON object in Java?
• Convert a JSON String to Java Object using the json-simple library in Java?
• How to serialize a JSON object with JsonWriter using Object Model in Java?
• Sorting a JSON object in JavaScript
• Flattening a JSON object in JavaScript
• How to convert JSON text to JavaScript JSON object?
• How to convert the JSON object to a bean using JSON-lib API in Java?
• Convert a JSON object to XML format in Java?
• Create array from JSON object JavaScript