<< Chapter < Page Chapter >> Page >

Go back to Question 6

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

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
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
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Object-oriented programming (oop) with java' conversation and receive update notifications?

Ask