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This code produces the screen output shown in Figure 4 .

Figure 4. Information about the second player. Second Player's Name: Joe Second Player's cards4-heart 5-heart6-club 7-diamond

The end of the program

Listing 6 signals the end of the main method and the end of the program.

Run the program

Click here to download a zip file containing a JSON data file named junk.json that can be used to experiment with this program.

I encourage you to copy the code from Listing 7 . Execute the code and confirm that you get the same results as those shown in Figure 1 through Figure 4 . Experiment with the code, making changes, and observing the results of your changes. Make certain that youcan explain why your changes behave as they do.

Complete program listing

A complete listing of the program named Code is provided in Listing 7 .

Listing 7 . The program named Code.java. /******************************************************************** Copyright: R.G.Baldwin 2016Revised: 06/01/16 Reads a json string from a file, parses, anddisplays some of its parts. Tested with Java 8, Windows 7, andjson-simple-1.1.1. ********************************************************************/import org.json.simple.JSONObject; import org.json.simple.JSONArray;import org.json.simple.JSONValue; import java.io.IOException;import java.io.FileReader; import java.util.*;class Code{ public static void main(String[]args){ //Instantiate a JSONObject object, which is a subclass of the// Java HashMap class. JSONObject jsonMap = null;try{ //Read json string from a file and parse it into a HashMap.jsonMap = (JSONObject)(JSONValue.parse(new FileReader("junk.json")));}catch(IOException ex){ ex.printStackTrace();}//end catch //Get and display the json stringSystem.out.println("json string: " + jsonMap); System.out.println();//blank line//Get the game array into an ArrayList object. JSONArray gameArrayList = (JSONArray)jsonMap.get("game");//Get and display info about the first player.JSONObject firstPlayerMap = (JSONObject)gameArrayList.get(0); System.out.println("First Player's Name: " +firstPlayerMap.get("name"));JSONArray firstPlayerCardsList = (JSONArray)firstPlayerMap.get("cards");System.out.println("First Player's cards"); Iterator<String>iterator = firstPlayerCardsList.iterator(); while (iterator.hasNext()) {System.out.println(iterator.next()); }//end while loop//Get and display info about the second player. System.out.println();JSONObject secondPlayerMap = (JSONObject)gameArrayList.get(1); System.out.println("Second Player's Name: " +secondPlayerMap.get("name"));JSONArray secondPlayerCardsList = (JSONArray)secondPlayerMap.get("cards");System.out.println("Second Player's cards"); iterator = secondPlayerCardsList.iterator();while (iterator.hasNext()) { System.out.println(iterator.next());}//end while loop }//end main}//end class Code


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Json0230: Decoding JSON Arrays
  • File: Json0230.htm
  • Published: 06/01/16

Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version of the module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.


Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
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