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This module introduces Java data types.

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

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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

I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
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
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
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
How can I make nanorobot?
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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