JSONObject example in Java

In the previous section of JSON tutorials you have seen how JSON can be used with JavaScript to create objects and arrays, you have also studied how to parse and create messages with JSON in JavaScript. Now in this part you will study how to use JSON in Java.

To have functionality of JSON in java you must have JSON-lib. JSON-lib also requires following "JAR" files:

commons-lang.jar
commons-beanutils.jar
commons-collections.jar
commons-logging.jar
ezmorph.jar
json-lib-2.2.2-jdk15.jar

JSON-lib is a java library for that transforms beans, collections, maps, java arrays and XML to JSON and then for retransforming them back to beans, collections, maps and others.

In this example we are going to use JSONObject class for creating an object of JSONObject and then we will print these object value. For using JSONObject class we have to import following package "net.sf.json". To add elements in this object we have used put() method. Here is the full example code of FirstJSONJava.java is as follows:

FirstJSONJava.java


import net.sf.json.JSONObject;



public class FirstJSONJava

{

  public static void main(String args[]){

  JSONObject object=new JSONObject();

 object.put("name","Amit Kumar");

 object.put("Max.Marks",new Integer(100));

 object.put("Min.Marks",new Double(40));

 object.put("Scored",new Double(66.67));

 object.put("nickname","Amit");

 System.out.println(object);

  }

}

To run this example you have to follow these few steps as follows:

Download JSON-lib jar and other supporting Jars
Add these jars to your classpath
create and save FirstJSONJava.java
Compile it and execute ,You will get following output:

Output:

Download Source Code

JSONObject example in Java