How can we merge two JSON objects in Java?

JSON is a lightweight data exchange format. The format of JSON is key-value pairs. JSONObject can parse text in a string to generate map-like objects and supports the java.util.Map interface. We can merge two JSON objects in Java using org.json.simple.JSONObject.

We can use the putAll() method in the program below to merge two JSON objects (inherited from the interface java.util.Map).

import java.util.Date;
import org.json.simple.JSONObject;
public class MergeJsonObjectsTest {
   public static void main(String[] args) {
      JSONObject jsonObj = new JSONObject(); // first json object
      jsonObj.put("Name", "Adithya");
      jsonObj.put("Age", 25);
      jsonObj.put("Address", "Hitech City");
      JSONObject jsonObj1 = new JSONObject(); // second json object
      jsonObj1.put("City", "Hyderabad");
      jsonObj1.put("DOB", new Date(104, 3, 6));
      jsonObj.putAll(jsonObj1); // merging of first and second json objects
      System.out.println(jsonObj);
   }
}

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{"Address":"Hitech City","DOB":Tue Apr 06 00:00:00 IST 2004,"City":"Hyderabad","
Age":25,"Name":"Adithya"}

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