<< Chapter < Page Chapter >> Page >

One author suggests that even the middle clause can be empty, but it isn't obvious to this author how the loop would ever terminate if there is noconditional expression to be evaluated. Perhaps the loop could be terminated by using a break inside the loop, but in that case, you might just as welluse a while loop.

The for-each loop

There is another form of loop structure that is often referred to as a for-each loop. In order to appreciate the benefits of this loop structure, you need to be familiar with Java collections and iterators,both of which are beyond the scope of this module.

As near as I can tell, there is nothing that you can do with the for-each loop that you cannot also do with the conventional for loop described above. Therefore, I rarely use it. You can find a description ofthe for-each loop on this Oracle website .

I don't plan to discuss it further in this module. However, before you go for a job interview, you should probably do some online research and learn about itbecause an interviewer could use a question about the for-each loop to trip you up in the Q and A portion of the interview.

The do-while loop

The do-while loop is another implementation of the loop pillar mentioned earlier . However, it differs from the while loop and the for loop in one important respect; it is an exit-condition loop.

An exit-condition loop

Java provides an exit-condition loop having the syntax shown in Figure 6 .

Figure 6 . Syntax of a do-while loop.
do { statements} while (conditional expression);

Behavior

The statements in the body of the loop continue to be executed for as long as the conditional expression evaluates to true.An exit-condition loop guarantees that the body of the loop will be executed at least one time, even if the conditional expressionevaluates to false the first time it is tested.

The break and continue statements

General behavior

Although some authors suggest that the break and continue statements provide an alternative to the infamous goto statement of earlier programming languages, it appears that the behaviors of the labeled break and labeled continue statements are muchmore restrictive than a general goto .

Unlabeled break and continue

The break and continue statements are supported in both labeled and unlabeled form.

First consider the behavior of break and continue in their unlabeled configuration.

Use of a break statement

The break statement can be used in a switch statement or in a loop. When encountered in a switch statement, breakcauses control to be passed to the next statement outside the innermost enclosing switch statement.

When break is encountered in a loop, it causes control to be passed to the next statement outside the innermost enclosing loop.

As you will see later, labeled break statements can be used to pass control to the next statement following switch or loop statementsbeyond the innermost switch or loop statement when those statements are nested.

Use of a continue statement

The continue statement cannot be used in a switch statement, but can be used inside a loop.

Questions & Answers

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
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.
Harper
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
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
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
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
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
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
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
QuizOver.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?

Ask