JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

Checkout for Promo Codes

How to create Json Array using Object Model?


This page shows how to create Json array using Object Model.

Note: Refer How to read Json data using JsonReader? page for dependent libraries.

Java example to create json array:

package com.javaapi.json.examples;

import java.io.StringWriter;

import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonArrayBuilder;
import javax.json.JsonObject;
import javax.json.JsonObjectBuilder;
import javax.json.JsonWriter;

public class CreateJsonObjEx {

	public static void main(String a[]){
		
		JsonObjectBuilder jsonBuilder = Json.createObjectBuilder();
		jsonBuilder.add("emp_name", "Nataraj G");
		jsonBuilder.add("emp_id", 1016);
		jsonBuilder.add("salary", 20000);
		
		// create Json array with only values
		JsonArrayBuilder plnArrBld = Json.createArrayBuilder();
		plnArrBld.add("Rakesh");
		plnArrBld.add("John");
		JsonArray arr = plnArrBld.build();
		// the array got created, add it to the json as a child element
		jsonBuilder.add("direct_contacts", arr);
		
		// create an array of key-value pairs
		JsonArrayBuilder kvArrBld = Json.createArrayBuilder();
		// create each key-value pair as seperate object and add it to the array
		kvArrBld.add(Json.createObjectBuilder().add("email", "[email protected]").build());
		kvArrBld.add(Json.createObjectBuilder().add("mobile", "123123123123").build());
		
		JsonArray contactsArr = kvArrBld.build();
		// add contacts array object
		jsonBuilder.add("contacts", contactsArr);
		
		JsonObject empObj = jsonBuilder.build();
		// here we are writing to String writer. 
		// if you want you can write it to a file as well
		StringWriter strWtr = new StringWriter();
        JsonWriter jsonWtr = Json.createWriter(strWtr);
        jsonWtr.writeObject(empObj);
        jsonWtr.close();
        
        System.out.println(strWtr.toString());
	}
}

Output:
{
    "emp_name": "Nataraj G",
    "emp_id": 1016,
    "salary": 20000,
    "direct_contacts": [
        "Rakesh",
        "John"
    ],
    "contacts": [
        {
            "email": "[email protected]"
        },
        {
            "mobile": "123123123123"
        }
    ]
}
<< Previous Program | Next Program >>

Java API for JSON processing examples

  1. How to read Json data using JsonReader?
  2. How to read Json array data using JsonArray?
  3. How to create Json Object using Object Model?
  4. How to create Json Array using Object Model?
  5. How to create Json Object using Streaming Model API?
  6. How to create Json Array using Streaming Model API?
Knowledge Centre
Exception Vs Error
An error is an irrecoverable condition occurring at runtime like out of memory error. These kind of jvm errors cannot be handled at runtime. Exceptions are because of condition failures, which can be handled easily at runtime.
Famous Quotations
The greatest obstacle to discovery is not ignorance; it is the illusion of knowledge.
-- Daniel J. Boorstin

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

Most Visited Pages

Other Interesting Sites

Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
Privacy Policy | Copyright © 2020 by Nataraja Gootooru. All Rights Reserved.