<< Chapter < Page Chapter >> Page >
This page explains the inheritance structure of the json-simple Java library and how it fits into the standard Java library.

Revised: Thu Jun 02 19:23:22 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 explains the inheritance structure of the json-simple Java library and how it fits into the standard Java library.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the Figuresand Listings while you are reading about them.

Figures

Listings

General background information

The earlier page titled Json0205: Getting Started provided a download link for a standard javadoc documentation package for version 1.1 of the json-simple Java library. That documentation package shows that the library contains the following packages:

  • org.json.simple
  • org.json.simple.parser

Those packages contain the following classes and interfaces with the interfaces shown in Italics :

  • ContainerFactory
  • ContentHandler
  • ItemList
  • JSONArray
  • JSONAware
  • JSONObject
  • JSONParser
  • JSONStreamAware
  • JSONValue
  • ParseException
  • Yytoken

The jar file also contains a class named Yylex in the org.json.simple.parser package that did not show up in the documentation. It didn't show up in the documentation because it is package-private and therefore not intended for our direct use. It is used internally by code in the class named JSONParser .

Discussion and sample code

Listing 1 provides the code for a Java program that establishes the position in the class hierarchy of each of the classes in the json-simple library by displaying the superclass of each of those classes. Figure 1 shows the screen output produced by this program.

Figure 1. Inheritance hierarchy. ItemList: class java.lang.Object JSONArray: class java.util.ArrayListJSONObject: class java.util.HashMap JSONParser: class java.lang.ObjectJSONValue: class java.lang.Object ParseException: class java.lang.ExceptionYytoken: class java.lang.Object

The class named ParseException extends the standard class named Exception as you might expect.

Four of the classes extend the class named Object , which is not particularly surprising. New classes extend the Object class by default unless they are defined to purposely extend some other class.

The most important thing shown in Figure 1 is that the JSONArray classextends the standard ArrayList class and the JSONObject class extendsthe standard HashMap class. These standard classes are part of the Java Collections Framework .

This illustrates one of the most important features of the json-simple library. The library maximizes the use of standard classes from the Java Collections Framework . Once you have a reference to an object of the JSONArray class or an object of the JSONObject class, you have access to all of the polymorphic features provided by that framework. You also have access to the methods defined by thosetwo classes and the classes defined by their superclasses. Therefore, if you are already skilled at programming within the collections framework, it is a small step to add JSON programming to your skill set.

Questions & Answers

what is mutation
Janga Reply
what is a cell
Sifune Reply
how is urine form
Sifune
what is antagonism?
mahase Reply
classification of plants, gymnosperm features.
Linsy Reply
what is the features of gymnosperm
Linsy
how many types of solid did we have
Samuel Reply
what is an ionic bond
Samuel
What is Atoms
Daprince Reply
what is fallopian tube
Merolyn
what is bladder
Merolyn
what's bulbourethral gland
Eduek Reply
urine is formed in the nephron of the renal medulla in the kidney. It starts from filtration, then selective reabsorption and finally secretion
onuoha Reply
State the evolution relation and relevance between endoplasmic reticulum and cytoskeleton as it relates to cell.
Jeremiah
what is heart
Konadu Reply
how is urine formed in human
Konadu
how is urine formed in human
Rahma
what is the diference between a cavity and a canal
Pelagie Reply
what is the causative agent of malaria
Diamond
malaria is caused by an insect called mosquito.
Naomi
Malaria is cause by female anopheles mosquito
Isaac
Malaria is caused by plasmodium Female anopheles mosquitoe is d carrier
Olalekan
a canal is more needed in a root but a cavity is a bad effect
Commander
what are pathogens
Don Reply
In biology, a pathogen (Greek: πάθος pathos "suffering", "passion" and -γενής -genēs "producer of") in the oldest and broadest sense, is anything that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ. The term pathogen came into use in the 1880s.[1][2
Zainab
A virus
Commander
Definition of respiration
Muhsin Reply
respiration is the process in which we breath in oxygen and breath out carbon dioxide
Achor
how are lungs work
Commander
where does digestion begins
Achiri Reply
in the mouth
EZEKIEL
what are the functions of follicle stimulating harmones?
Rashima Reply
stimulates the follicle to release the mature ovum into the oviduct
Davonte
what are the functions of Endocrine and pituitary gland
Chinaza
endocrine secrete hormone and regulate body process
Achor
while pituitary gland is an example of endocrine system and it's found in the Brain
Achor
what's biology?
Egbodo Reply
Biology is the study of living organisms, divided into many specialized field that cover their morphology, physiology,anatomy, behaviour,origin and distribution.
Lisah
biology is the study of life.
Alfreda
Biology is the study of how living organisms live and survive in a specific environment
Sifune
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




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