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Answer 5

True. The JSONArray class provides two overloaded versions of the method named toJSONString . One is an instance method and the other is a static method. On a side note, this is also true of the class named JSONObject .

Go back to Question 5

Answer 4

False. The code in Listing 2 produces the screen output shown in Figure 4 . Unlike an object of the JSONObject class, an object of the JSONArray class is an ordered list. By this we meanthat the user has precise control over where in the list each element is inserted. The user can access elements by their integer index (position in the list) .

Go back to Question 4

Answer 3

False. The code in Listing 1 produces the screen output with the errors shown in Figure 2 . The JSONArray class neither defines nor inherits a method named put .

Go back to Question 3

Answer 2

False. The JSONArray class extends the ArrayList class, which implements the List interface. Therefore, an object of the JSONArray class is a list and is not an array. For example, the elements in a JSONArray object cannot be accessed using the square bracket ([]) notation commonly associated with Java arrays. Instead, the elements are accessed using the add and get methods declared in the List interface and inherited from the ArrayList class.

Go back to Question 2

Answer 1

False. The JSONArray class extends the standard Java ArrayList class.

Go back to Question 1

Figures

This section contains Figures that may be referred to by one or more questions or answers.

Figure 1

[{"Name":"Tom"},{"Age":21},{"Student":true}]

Figure 2

Code01.java:22: error: cannot find symbol array.put(jsonObj01);^ symbol: method put(JSONObject)location: variable array of type JSONArray Code01.java:23: error: cannot find symbolarray.put(jsonObj02); ^symbol: method put(JSONObject) location: variable array of type JSONArrayCode01.java:24: error: cannot find symbol array.put(jsonObj03);^ symbol: method put(JSONObject)location: variable array of type JSONArray Note: Code01.java uses unchecked or unsafe operations.Note: Recompile with -Xlint:unchecked for details. 3 errorsError: Could not find or load main class Code01 Press any key to continue . . .

Figure 3

[{"Name":"Tom"},{"Age":21},{"Student":true}]

Figure 4

[{"Name":"Tom"},{"Student":true},{"Age":21}]

Figure 5

[{"Name":"Tom"},{"Age":21},{"Student":true}] [{"Name":"Tom"},{"Age":21},{"Student":true}]

Figure 6

{"person":[{"Student":true},{"Age":21},{"Name":"Tom"}]}

Figure 7

[{"Student":true},{"Age":21},{"Name":"Tom"}]

Figure 8

{"person":[{"Name":"Tom"},{"Age":21},{"Name":"Tom"}]}

Listings

This section contains Listings that may be referred to by one or more questions or answers.

Listing 1

/************************************************ Copyright: R.G.Baldwin 2016Tested with Java 8, Windows 7, and json-simple-1.1.1.************************************************/ import org.json.simple.JSONObject;import org.json.simple.JSONArray; class Code01{public static void main(String[] args){JSONObject jsonObj01 = new JSONObject(); jsonObj01.put("Name","Tom");JSONObject jsonObj02 = new JSONObject(); jsonObj02.put("Age",21);JSONObject jsonObj03 = new JSONObject(); jsonObj03.put("Student",true);JSONArray array = new JSONArray();array.put(jsonObj01); array.put(jsonObj02);array.put(jsonObj03); System.out.println(array.toJSONString());}//end main}//end class Code01

Questions & Answers

how can chip be made from sand
Eke Reply
are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
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
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
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
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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