JSON Accumulate 

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 using accumulate method of JSONObject. It accumulates the values under a key. If we put multiple values for the same key, it replaces the value with a JSONArray containing all values.

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

package com.bethecoder.tutorials.json_java.tests; import org.json.JSONException; import org.json.JSONObject; public class JsonAccumulate {   /**    * @param args    * @throws JSONException     */   public static void main(String[] args) throws JSONException {     JSONObject jsonObj = new JSONObject();     jsonObj.accumulate("certificates", "SCJA");     System.out.println(jsonObj.toString(2));          jsonObj.accumulate("certificates", "SCJP");     jsonObj.accumulate("certificates", "SCWCD");     System.out.println(jsonObj.toString(2));   } }

{"certificates": "SCJA"}

{"certificates": [
  "SCJA",
  "SCJP",
  "SCWCD"
]}