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Figure 1. The screen output. {"student":true,"name":"Joe","age":21} {"student":false,"name":"Sue","age":32}{"student":true,"name":"Tom","age":19}

The format for each line of text that you see in Figure 1 is the format that you would expect for a JSON string that doesn't include array data. (See Introducing JSON for more details regarding format.)

Briefly, each key is separated from its value by a colon (:) . Each key/value pair is separated from its neighbors by a comma (,) . The JSON string begins with a left brace ({) and ends with a right brace (}) . Keys are surrounded by double quotation characters. Values may or may not beseparated by double quotation characters, depending on their type. Some characters inside of values, such as double quotation characters and backslashcharacters must be escaped with a backslash character (\" and \\) but that is not shown by this program.

Note that the display order for the key/value pairs shown in Figure 1 does not match the order in which the objects were populated in Listing 2 and Listing 3 . A HashMap does not impose an ordering on its contents and does not guarantee that the ordering will remainconstant over time.

The end of the program

Listing 5 also signals the end of the main method and the end of the program.

Run the program

I encourage you to copy the code from Listing 6 . Execute the code and confirm that you get the same results as those shown in Figure 1 . 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.java is provided in Listing 6 .

Listing 6. The program named Code.java. /******************************************************************** Copyright 2016 R.G.BaldwinConstructs three JSONObject objects and saves them in an ArrayList. Transforms each JSONObject object into a String object and saves thestrings in a second ArrayList object. Displays the strings.Tested with Java 8, Win 7, and json-simple-1.1.1.jar. ********************************************************************/import org.json.simple.JSONObject; import java.util.ArrayList;import java.util.Iterator; class Code {public static void main(String[] args){//Create a container for several JSON objects. ArrayList<JSONObject>listA = new ArrayList<JSONObject>(); //Create a container for several JSON stringsArrayList<String>listB = new ArrayList<String>();//Create and populate the first JSONObject with unordered // key/value pairs.listA.add(new JSONObject()); listA.get(0).put("name","Joe");listA.get(0).put("age",21); listA.get(0).put("student",true);//Create and populate the second JSONObject. Note that the object// is populated in a different order than above. listA.add(new JSONObject());listA.get(1).put("student",false); listA.get(1).put("name","Sue");listA.get(1).put("age",32);//Create and populate the third JSONObject listA.add(new JSONObject());listA.get(2).put("name","Tom"); listA.get(2).put("age",19);listA.get(2).put("student",true); //Transform the three JSON objects into JSON strings and save// them in ListB. Could write them to disk for transfer to a // different programming environment at this point.Iterator<JSONObject>iteratorA = listA.iterator(); while (iteratorA.hasNext()){listB.add(iteratorA.next().toJSONString()); }//end while loop//Display the JSON strings currently stored in listB. Note that // the display order does not necessarily match the order in// which the original objects were populated. Iterator<String>iteratorB = listB.iterator(); while (iteratorB.hasNext()){System.out.println(iteratorB.next()); }//end while loop}//end main }//end class Code

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Json0215: Encoding JSON Strings
  • File: Json0215.htm
  • Published: 05/31/16
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

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
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
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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
Bharti
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
Daniel
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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