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Answer 7

Question 8

True or False? A class must be declared abstract if it contains two or more abstract method declarations.

Answer 8

Question 9

True or False? If a class inherits an abstract method, either the subclass must be declared abstract, or it must provide a concrete overridden version ofthe inherited abstract method.

Answer 9

Question 10

True or False? The primary purpose of a constructor is to assist in the initialization of the state of an object , which depends on the values stored in its variables.

Answer 10

Question 11

True or False? The default version of the toString method is defined in the class named Class .

Answer 11

Question 12

True or False? There is an overloaded version of the println method that requires an incoming parameter of type Object . When that version of the method is called, it calls the toString method on the incoming object reference and displays the string that is returnedby the toString method. If the toString method belonging to the object has not been overridden, the default version of the toString method will be executed and the string that will be displayed is the string returned by that default version. The toString method can be overridden to cause the string that is displayed to be moreappropriate for the object. The toString method can be overridden only once in the class hierarchy.

Answer 12

Figures

Listings

  • Listing 1 . Source code for Java3008r.java.

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 the same time.

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

Spacer image of a rabbit and a penguin.

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

Spacer image of a penguin in the snow in front of some houses.

Answers

Answer 12

False. The toString method can be overridden by every class that inherits it.

Back to Question 12

Answer 11

False. The default version of the toString method is defined in the class named Object .

Back to Question 11

Answer 10

True.

Back to Question 10

Answer 9

True.

Back to Question 9

Answer 8

False. A class must be declared abstract if it contains one or more abstract method declarations.

Back to Question 8

Answer 7

True.

Back to Question 7

Answer 6

True.

Back to Question 6

Answer 5

False. The same abstract method can be overridden in different ways in different subclasses. In other words, the behavior of the overridden version canbe tailored to (be appropriate for) the class in which it is overridden.

Back to Question 5

Answer 4

True.

Back to Question 4

Answer 3

False. An abstract method has no body. Therefore, it is incomplete, has no behavior, and cannot be executed.

Back to Question 3

Answer 2

True.

Back to Question 2

Answer 1

False. Listing 1 produces the output shown in Figure 2 except that the numeric values may vary from one run to the next. Note that the toString method is not overridden in Listing 1 .

Figure 2 . Output from code in Listing 1 .
Java3008r DickJava3008rMyClass@4f1d0d 2727

Back to Question 1

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java3008r Review
  • File: Java3008r.htm
  • Published: 02/12/13
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

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
Bharti
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
for teaching engĺish at school how nano technology help us
Anassong
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
NANO
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
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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