JSON Subset 

JSON (JavaScript Object Notation) is a lightweight text-based open standard designed for human-readable data interchange. Douglas Crockford has provided a reference implementation of JSON in Java at http://json.org/ useful for JSON serialization and deserialization. Click here to download the compiled library. The following example shows serializing a subset of simple JSON object.

File Name  :   com/bethecoder/tutorials/json_java/tests/JsonSubset.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.json_java.tests; import java.util.Date; import java.util.HashMap; import java.util.Map; import org.json.JSONException; import org.json.JSONObject; public class JsonSubset {   /**    * @param args    * @throws JSONException     */   public static void main(String[] args) throws JSONException {     Map<String, Object> map = new HashMap<String, Object>();     map.put("name", "Sriram");     map.put("age", 2);     map.put("dob", new Date(110, 4, 6));     map.put("hobby", "painting");          JSONObject obj = new JSONObject(map);     System.out.println(obj.toString(2)); //pretty print with indent          JSONObject subset = new JSONObject(obj, new String [] { "name", "age" });     System.out.println(subset.toString(2)); //pretty print with indent   } }

{
  "name": "Sriram",
  "age": 2,
  "dob": "Thu May 06 00:00:00 IST 2010",
  "hobby": "painting"
}

{
  "age": 2,
  "name": "Sriram"
}