JSON Interview Question

Q1. Who is founder of JSON?

Ans: The Founder of the JSON is Douuglas Crockfrord.

Q2. What is JSON Syntax ?

Exp: The JSON Syntaxt is a set of the JavaScript Object and you must follow rules for that when you will create JSON.

- The curly brackets hold objects.

- A data is in name and value paires

- The square bracket holds arrays

- A data is separated by comma

- Json is text base

Q3. Why JSON is popular?

Ans: Becuase the JSON is light weith stander for exchanges infomraiotn:

   - JSON is independent of language

   - It is easy for reading and writing for humans and machine.

   - It is easy for Encoding and Decode.

   - It is mostly used in Mobile application.

   - Most of browse is support like as IE8,Opera 10,Crome and Firefox

Q4. What type of data Supported by JSON?

Ans: Bellow the Data type support by JSON inclide.

  - Array

  - Number

  - Null

  - String

  - Object and

  - Boolean

Q5. What is difference in JSON and JSONP?

Ans:

  - JSON: The json is sample data format used for the communication mudium between other System and

  - JSONP :Yhe JSONP is methodology for using that foramt with cross domain Ajax request while not being affected by same origin policy issue.

Q.6 Sample example on JSON in java ?

Ans:

Step 1: Added bellow entery into you pom.xml file

     >dependency<

        >groupId<com.googlecode.json-simple>/groupId<

        >artifactId<json-simple>/artifactId<

        >version<1.1.1>/version<

     >/dependency<

Step 2:Write the Sampel java Example

SampleJSON.java

    import org.json.simple.JSONArray;

    import org.json.simple.JSONObject;

    import java.io.FileWriter;

    import java.io.IOException;

public class SampleJSON {

     public static void main(String[] args) {

        JSONObject obj = new JSONObject();

        obj.put("name", "java-webWorld.blogspot.in");

        obj.put("age", new Integer(30);

        JSONArray list = new JSONArray();

        list.add("Strong 1");

        list.add("Good 2");

        list.add("Bad 3");

         obj.put("Messages", list);

         try (FileWriter file = new FileWriter("C:\\Sampletest.json")) {

             file.write(obj.toJSONString());file.flush();

         } catch (IOException e) { e.printStackTrace();}

         System.out.print(obj);

     }

}

Step 3:When you will Execute above this java class ,you will get bellow result

 C:\\Sampletest.json

{

                "age":30,

                "name":"java-webWorld.blogspot.in",

                "messages":["Strong 1","Good 2","Bad 3"]

}