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Answer 18

What is the meaning of the following two images?

This image was inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.

The image is also an example of the kinds of things that we do in my course titled ITSE 2321, Object-Oriented Programming.

Missing image

This image was also inserted for the purpose of inserting space between the questions and the answers.

Missing image

Answers

Answer 18

Every instance of a class has its own set of instance variables. You can only access instance variables and instance methods through an object of the class. In this case, forty bytes of memory would be required to containthe instance variables of the ten objects.

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Answer 17

Only one, because out is a class variable of the System class.

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Answer 16

The runtime system allocates a class variable only once no matter how many instances of the class are instantiated. Thus, all objects of the classshare the same physical memory space for the class variable, and in this case, only four bytes of memory will be allocated to contain the allocated variables.

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Answer 15

The statement in Answer 14 calls the println method belonging to an object of the PrintStream class, which is referenced (pointed to) by the out variable, which is a class variable of the System class.

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Answer 14

System.out.println("Dick Baldwin");

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Answer 13

The println method can be accessed by joining the name of a variable that references a PrintStream object to the name of the println method using a period.

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Answer 12

The println method causes its argument to be displayed on the standard output device. (The standard output device is the screen by default, but can be redirected by the user at the operating system level.)

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Answer 11

The println method is an instance method of the PrintStream class.

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Answer 10

The out variable in the System class refers to an instance of the PrintStream class (a PrintStream object), which is automatically instantiated when the System class is loaded into the application.

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Answer 9

True.

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Answer 8

The code fragment accesses the contents of the class variable named out in the class named System .

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Answer 7

False. the variable named out defined in the System class is a reference variable that points to an object of another type.

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Answer 6

False. A class variable can be a primitive type, or it can be a reference variable that points to another object.

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Answer 5

True.

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Answer 4

False. The System class has several class variables (including out and in ) that are useful without the requirement to instantiate an object of the System class.

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Answer 3

False. While it is probably true that the main method must instantiate objects of other classes in order to accomplish much that is of value, this isnot a requirement. The main method in the "Hello World" program of this module does not instantiate objects of any class at all.

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Answer 2

False. The main method can access the variables and methods of objects instantiated from other classes. Otherwise, the flow of the program would bestuck within the main method itself and wouldn't be very useful.

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Answer 1

True.

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Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Jb0190r: Review: Using the System and PrintStream Classes
  • File: Jb0190r.htm
  • Published: 11/22/12
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

Questions & Answers

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
Daniel
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
Maciej
characteristics of micro business
Abigail
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.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
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
Do you know which machine is used to that process?
s.
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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