How to automatically add properties of JSONObject in Java?

A JSONObject is an unordered collection of name/value pairs and parses text from a string to generate something like Object that maps to . However, we can use the increment() method of the JSONObject class to automatically increment the properties of JSONObject. If there is no such attribute, create an attribute with the value 1. If such a property exists and it is an integer, long, double, or float, then it is incremented by one.

Syntax

public JSONObject increment(java.lang.String key) throws JSONException

Example

import org.json.JSONException;
import org.json.JSONObject;
public class IncrementJSONObjectTest {
   public static void main(String[] args) throws JSONException {
<strong>      </strong>JSONObject jsonObj = new JSONObject();
      jsonObj.put("year", 2019);
      jsonObj.put("age", 25);
      System.out.println(jsonObj.toString(3));
      jsonObj.increment("year").increment("age");
      System.out.println(jsonObj.toString(3));
      jsonObj.increment("year").increment("age");
      System.out.println(jsonObj.toString(3));
      jsonObj.increment("year").increment("age");
      System.out.println(jsonObj.toString(3));
   }
}

Output

{
 "year": 2019,
 "age": 25
}
{
 "year": 2020,
 "age": 26
}
{
 "year": 2021,
 "age": 27
}
{
 "year": 2022,
 "age": 28
}

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