How do we encode JSON objects in Java?

JSONObject is a subclass of java.util.HashMap which does not provide ordering. We can also use strict ordering of elements with the help of the JSONValue.toJSONString(map) method, i.e. through the implementation of java.util.LinkedHashMap. p>

We can encode JSON objects in the two examples below.

Example

import java.util.*;
import org.json.simple.JSONObject;
public class JSONEncodingTest {
   public static void main(String[] args) {
      Map<Object, Object> dataMap = new HashMap<Object, Object>();
      dataMap.put("Name", "Adithya");
      dataMap.put("Age", new Integer(25));
      dataMap.put("Salary", new Double(25000.00));
      dataMap.put("Employee Id", new Integer(115));
      dataMap.put("Company", "TutorialsPoint");
      JSONObject jsonObj = new JSONObject(dataMap);
      System.out.print("Encoding a JSON object: ");
      System.out.print(jsonObj);
   }
}

Output

Encoding a JSON object: {"Salary":25000.0,"Employee id":115,"Company":"TutorialsPoint","Age":25,"Name":"Adithya"}

import java.io.*;
import org.json.simple.*;
public class JSONEncodingTest1 {
   public static void main(String[] args) throws IOException {
      JSONObject obj = new JSONObject();
      obj.put("Name", "Jai");
      obj.put("Mobile_Number", new Integer(995998480));
      obj.put("Bank_Balance", new Double(50000.00));
      obj.put("Is_A_SelfEmployee", new Boolean(false));
      StringWriter out = new StringWriter();
      obj.writeJSONString(out);
      String jsonText = out.toString();
      System.out.print(jsonText);
   }
}

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{"Is_A_SelfEmployee":false,"Bank_Balance":50000.0,"Mobile_Number":995998480,"Name":"Jai"}

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