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How to auto-increment the property of a JSONObject in Java?
A JSONObject is an unordered collection of name/value pairs and parses text from a String to produce a map-like object. However, we can auto-increment the property of a JSONObject using the increment() method of JSONObject class. If there is no such property, create one with a value of 1. If there is such a property and if it is an Integer, Long, Double or Float then add one to it.
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 { 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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