Org.Json - JSONObject Class

JSONObject class is a unordered collection of key-value pairs. It provides methods to access values by key and to put values. Following types are supported −

• Boolean

• JSONArray

• JSONObject

• Number

• String

• JSONObject.NULL object

Example - JSONObject of Strings

JsonDemo.java

package com.tutorialspoint;

import org.json.JSONObject;

public class JsonDemo {
   public static void main(String[] args) { 
      JSONObject week = new JSONObject();
      week.put("Mon", "Monday");
      week.put("Tue", "Tuesday");
      week.put("Wed", "Wednesday");
      week.put("Thu", "Thursday");
      week.put("Fri", "Friday");

      System.out.println(week);
   }
}

Output

{"Thu":"Thursday","Tue":"Tuesday","Wed":"Wednesday","Fri":"Friday","Mon":"Monday"}

Example - JSONObject of Integers

JsonDemo.java

package com.tutorialspoint;

import org.json.JSONObject;

public class JsonDemo {
   public static void main(String[] args) { 
      JSONObject weeklyScores = new JSONObject();
      weeklyScores.put("Mon", 100);
      weeklyScores.put("Tue", 101);
      weeklyScores.put("Wed", 102);
      weeklyScores.put("Thu", 103);
      weeklyScores.put("Fri", 104);

      System.out.println(weeklyScores);
   }
}

Output

{"Thu":103,"Tue":101,"Wed":102,"Fri":104,"Mon":100}

Example - JSONObject of Mixed Types

JsonDemo.java

package com.tutorialspoint;

import org.json.JSONArray;
import org.json.JSONObject;

public class JsonDemo {
   public static void main(String[] args) { 
      JSONObject jsonObject = new JSONObject();
      jsonObject.put("Name", "Robert");
      jsonObject.put("ID", 1);
      jsonObject.put("Fees", Double.valueOf(1000.21));
      jsonObject.put("Active", Boolean.TRUE);
      jsonObject.put("Other Details", JSONObject.NULL);

      JSONArray list = new JSONArray();
      list.put("foo");
      list.put(new Integer(100));
      jsonObject.put("list",list);
      System.out.println(jsonObject);
   }
}

Output

{"Active":true,"Other Details":null,"ID":1,"Fees":1000.21,"list":["foo",100],"Name":"Robert"}