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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

Miscellaneous

This section contains a variety of miscellaneous information.

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

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.

-end-

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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