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This page contains review questions and answers for the page titled "Json0215: Encoding JSON Strings" in the book titled "The json-simple Java Library".

Revised: Sat Jun 04 12:48:39 CDT 2016

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Table of Contents

Preface

This is a page from the book titled The json-simple Java Library . The book explains how to use the json-simple Java library to generate, transform, and query JSON text. This page provides review questionsand answers for the page titled Json0215: Encoding JSON Strings . Once you study that page, you should be able to answer the review questions in this page.

The questions and the answers in this page are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.

The figures and listings (if any) are grouped together. It is recommend that when a question or an answer refers to a figure or a listing, that you open it in a new window tomake it easy to view it while reading the question or the answer.

Questions

Question 1 .

True or False? Once you have an object of the class named JSONObject , you can call any of the methods defined in the HashMap class on that object.

Go to answer 1

Question 2

True or False? The code shown in Listing 1 produced the screen output shown in Figure 1 .

Go to answer 2

Question 3

True or False? The code shown in Listing 3 produced the screen output shown in Figure 3 .

Go to answer 3

Figure index

Listing index

What is the meaning of the following two images?

These images were inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.

Spacer image of a rabbit and a penguin.

This image was also inserted for the purpose of inserting space between the questions and the answers.

Spacer image of a penguin and some houses.

Answers

Answer 3

True. The code in Listing 3 uses the get method inherited from the HashMap class to get and display the values associated with the keys "name", "age", and "student".

Go back to Question 3

Answer 2

False. The code in Listing 1 produced the output with the compiler error message shown in Figure 2 . The output shown in in Figure 1 was produced by the code shown in Listing 2 . Note the call to the toJSONString method of the JSONObject class to extract the information from the JSONObject object and encode it into a JSON string.

Go back to Question 2

Answer 1

True. The class named JSONObject extends the standard Java class named HashMap . Therefore, the JSONObject class inherits all of the methods defined in the HashMap 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

{"student":true,"name":"Joe","age":21}

Figure 2

Code01.java:20: error: no suitable method found for get(no arguments) String jsonString = jsonObject.get();

Figure 3

Joe 21true

Listings

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

Listing 1

import org.json.simple.JSONObject; class Code01 {public static void main(String[] args){JSONObject jsonObject= new JSONObject(); jsonObject.put("name","Joe");jsonObject.put("age",21); jsonObject.put("student",true);String jsonString = jsonObject.get(); System.out.println(jsonString);}//end main }//end class Code01

Listing 2

import org.json.simple.JSONObject; class Code02 {public static void main(String[] args){JSONObject jsonObject= new JSONObject(); jsonObject.put("name","Joe");jsonObject.put("age",21); jsonObject.put("student",true);String jsonString = jsonObject.toJSONString(); System.out.println(jsonString);}//end main }//end class Code02

Listing 3

import org.json.simple.JSONObject; class Code03 {public static void main(String[] args){JSONObject jsonObject= new JSONObject(); jsonObject.put("name","Joe");jsonObject.put("age",21); jsonObject.put("student",true);System.out.println(jsonObject.get("name")); System.out.println(jsonObject.get("age"));System.out.println(jsonObject.get("student")); }//end main}//end class Code03

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Json0215R: Review
  • File: Json0215R.htm
  • Published: 06/04/16
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware 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 ofthe module.

In the past, unknown individuals have copied my modules fromcnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. I neither receive compensationfor those sales nor do I know who does receive compensation. If you purchase such a book, please be aware that it is a copy of a modulethat is freely available on cnx.org and that it was made and published without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

Questions & Answers

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 to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
how can I make nanorobot?
Lily
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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