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Figure 7 . Range of values for floating-point types.
float 1.4E-45 to 3.4028235E38double 4.9E-324 to 1.7976931348623157E308

I will discuss the operations that can be performed on floating-point types in a future module.

The character type

Computers deal only in numeric values. They don't know how to deal directly with the letters of the alphabet and punctuation characters. This gives rise to a type named char .

Purpose of the char type

The purpose of the character type is to make it possible to represent the letters of the alphabet, the punctuation characters, and the numeric characters internally in the computer. This is accomplished by assigning a numeric value to each character, much as you may have done to create secret codes when you were a child.

A single character type

Java supports a single character type named char . The char type uses a standard character representation known as Unicode to represent up to 65,535 different characters.

Why so many characters?

The reason for the large number of possible characters is to make it possible to represent the characters making up the alphabets of many different countries and many different spoken languages.

What are the numeric values representing characters?

As long as the characters that you use in your program appear on your keyboard, you usually don't have a need to know the numeric value associated with the different characters. If you are curious, however, the upper-case A is represented by the value 65 inthe Unicode character set.

Representing a character symbolically

In Java, you usually represent a character in your program by surrounding it with apostrophes as shown below:


The Java programming tools know how to cross reference that specific character symbol against the Unicode table to obtain the corresponding numeric value. (A discussion of the use of the char type to represent characters that don't appear on your keyboard is beyond the scope of this module.)

I will discuss the operations that can be performed on the char type in a future module.

The boolean type

The boolean type is the simplest type supported by Java. It can have only two values:

  • true
  • false

Generally speaking, about the only operations that can be directly applied to an instance of the boolean type are to change it from true to false , and vice versa. However, the boolean type can be included in a large number of somewhat higher-level operations.

The boolean type is commonly used in some sort of a test to determine what to do next, such as that shown in Figure 8 .

Figure 8 . Example of the use of the boolean type.
Perform a test that returns a value of type boolean. if that value is true,do one thing otherwise (meaning that value is false)do a different thing

I will discuss the operations that can be performed on the boolean type in more detail in a future module.

User-defined or reference types

Extending the language

Java is an extensible programming language. By this, I mean that there is a core component to the language that is always available. Beyond the core component, different programmers can extend the language in different ways to meet their individual needs.

Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
I'm not good at math so would you help me
what is the problem that i will help you to self with?
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
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
what is system testing
what is the application of nanotechnology?
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
anybody can imagine what will be happen after 100 years from now in nano tech world
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
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
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
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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