<< Chapter < Page Chapter >> Page >
This module introduces Java data types.

Revised: Sun Mar 27 21:20:50 CDT 2016

This page is included in the following Books:

Table of contents



This module is part of a collection of modules designed to help you learn to program computers.

It introduces Java data types.


In addition to an Internet connection and a browser, you will need the following tools (as a minimum) to work through the exercises in these modules:

  • The Sun/Oracle Java Development Kit (JDK) (See (External Link) )
  • Documentation for the Sun/Oracle Java Development Kit (JDK) (See (External Link) )
  • A simple IDE or text editor for use in writing Java code.

The minimum prerequisites for understanding the material in these modules include:

  • An understanding of algebra.
  • An understanding of all of the material covered in the earlier modules in this collection.

Viewing tip

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


  • Figure 1 . Range of values for whole-number types.
  • Figure 2 . Definition of floating point.
  • Figure 3 . Different ways to represent 623.57185.
  • Figure 4 . Relationships between multiplicative factors and exponentiation.
  • Figure 5 . Other ways to represent the same information.
  • Figure 6 . Still other ways to represent 623.57185.
  • Figure 7 . Range of values for floating-point types.
  • Figure 8 . Example of the use of the boolean type.



Type-sensitive languages

Java and some other modern programming languages make heavy use of a concept that we refer to as type , or data type .

We refer to those languages as type-sensitive languages . Not all languages are type-sensitive languages. In particular, somelanguages hide the concept of type from the programmer and automatically deal with type issues behind the scenes.

So, what do we mean by type?

One analogy that comes to my mind is international currency. For example, many years ago, I spent a little time in Japan and quite along time on an island named Okinawa (Okinawa is now part of Japan) .

Types of currency

At that time, as now, the type of currency used in the United States was the dollar. The type of currency used in Japan was the yen, and thetype of currency used on the island of Okinawa was also the yen. However, even though two of the currencies had the same name, theywere different types of currency, as determined by the value relationships among them.

The exchange rate

As I recall, at that time, the exchange rate between the Japanese yen and the U.S. dollar was 360 yen for each dollar. The exchange ratebetween the Okinawan yen and the U.S. dollar was 120 yen for each dollar. This suggests that the exchange rate between the Japanese yen and theOkinawan yen would have been 3 Japanese yen for each Okinawan yen.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
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
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
Difference between extinct and extici spicies
Amanpreet Reply
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?