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The code in Listing 1 instantiates two objects of the class named ArrayList to serve as containers for the JSONObject objects and the JSON strings. This is plain vanilla Java code. There is nothing new here.

Create and populate a JSONObject object

Listing 2 creates and populates the first JSONObject object with key/value pairs. The keys are "name", "age", and "student" respectively. The value types are String , int , and boolean respectively.

Listing 2 . Create and populate a JSONObject object. listA.add(new JSONObject());listA.get(0).put("name","Joe"); listA.get(0).put("age",21);listA.get(0).put("student",true);

The code in Listing 2 begins by instantiating a new object of the JSONObject class and adding its reference into the first element (0) of the ArrayList object. Then it calls the get method on the ArrayList object three times in succession to gain access to the JSONObject . Each time it gains access to the JSONObject object, it calls the put method inherited from the HashMap class to store a key/value pair in the JSONObject object.

Note that the data stored in the JSONObject object is an unordered collection. As you will see later, the order inwhich the key/value pairs are extracted from the object using an iterator is unrelated to the order in which the key/value pairs are stored in the object.

Create and populate two more JSONObject objects

Listing 3 repeats the process two more times to create, populate, and save two more JSONObject objects. Note that one of these objects is populated in a different order than is the case in Listing 2 .

Listing 3 . Create and populate two more JSONObject objects. //Create and populate the second JSONObject. 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);

Encode the data into JSON strings

Listing 4 uses an Iterator to gain access to each populated JSONObject object. Each time it gains access to an object, it calls the toJSONString method that is defined in the JSONObject class to transform the object into a JSON string.

At this point, the program could write the JSON strings into an output stream for transfer to some other programming environment. However as mentionedearlier, to keep the program simple, the program saves the JSON strings as elements in a second ArrayList object.

Listing 4 . Encode the data into JSON strings. Iterator<JSONObject>iteratorA = listA.iterator(); while (iteratorA.hasNext()){listB.add(iteratorA.next().toJSONString()); }//end while loop

Display the JSON strings

Listing 5 uses an Iterator to access and display each of the JSON strings that are stored in the ArrayList object.

Listing 5 . Display the JSON strings. Iterator<String>iteratorB = listB.iterator(); while (iteratorB.hasNext()){System.out.println(iteratorB.next()); }//end while loop}//end main }//end class Code

The screen output is shown in Figure 1 .

Questions & Answers

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
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
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
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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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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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