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This module explains the use of the InetAddress class.

Table of contents

Preface

This module is one in a collection of modules designed for teaching INEW 2338 Advanced Java (Web) at Austin Community College in Austin, TX. More specifically, it is one in a sub-collection of modules designed forteaching network programming in that course. The purpose of this module is to introduce the student to the InetAddress class that can be used to deal with IP addresses and domain names .

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

  • Figure 1 . Program output.
  • Figure 2 . The list of Google IP addresses.
  • Figure 3 . The IP Address for my localhost.
  • Figure 4 . Name and IP address of my localhost.
  • Figure 5 . Canonical host name for Google.
  • Figure 6 . Google host name using reverse lookup.

Listings

  • Listing 1 . Beginning of the program.
  • Listing 2 . Display the Google InetAddress objects.
  • Listing 3 . Get InetAddress object for localhost.
  • Listing 4 . Extract name and IP address of my localhost.
  • Listing 5 . Get and display canonical host name for Google.
  • Listing 6 . Do a reverse lookup on Google.
  • Listing 7 . End of the program.
  • Listing 8 . Complete program listing.

General background information

Every computer attached to an IP network has a unique 32-bit or 128-bit IP address.

For human consumption, we usually convert each of the bytes in the IP address to an unsigned decimal value and display them connected by periods to make them easier toremember. As of this writing, the IP address of www.austincc.edu (the college where I teach) is 206.77.150.222.

The domain name

What do we mean when we speak of www.austincc.edu ?

Each IP address can have a corresponding name known as a domain name . The domain name for the IP address 206.77.150.222 is www.austincc.edu .

For example, I can enter either the IP address or the domain name into the address field of mybrowser and use it to connect to the ACC web site.

The Domain Name System (DNS)

The Domain Name System (DNS) was developed to translate between IP addresses and domain names. Whenever you log your browser onto the internet andattempt to connect to a server using its domain name , the browser first communicates with a DNS server to learn the corresponding numeric IPaddress. The numeric IP address is encapsulated into the data packets and used by the internet protocol to route those packets from the source to thedestination.

The InetAddress class

We will learn how to use methods of the Java InetAddress class to find the IP address corresponding to a domain name in this module.

We will learn how to find the canonical host name for a given domain name.

We will learn how to obtain information about the localhost .

We will learn how to do a reverse lookup to find the canonical host name associated with an IP address.

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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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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