<< Chapter < Page Chapter >> Page >
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

This page is included in the following Books:

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

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
QuizOver.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