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Listing 5 - Question 5.
/*File Q05.java ************************************************//* Integer and Double are both subclasses ofNumber. Both classes define a method named doubleValue that returns the encapsulatednumeric value as type double. Both classes also contain a method named intValue thatreturns the encapsulated numeric value as type int.*/ public class Q05{public static void main(String[] args){Foo<Integer>iFoo = new Foo<Integer>(15); System.out.println(iFoo.get().intValue());displayClass(iFoo); }//end main//-------------------------------------------// static void displayClass(Foo<Number>obj){ System.out.println(obj.getClass());}//end displayClass }//end class Q05//=============================================// class Foo<T extends Number>{ private T obj;public Foo(T obj){ this.obj = obj;}//end constructor public T get(){return obj; }//end get}//end Foo //=============================================//
Figure 5 - Question 5.
15 class Foo

Answer 5

Question 6

True or False: The code shown in Listing 6 will compile and run successfully producing the output shown in Figure 6 .

Listing 6 - Question 6.
/*File Q06.java ************************************************/import java.awt.Frame; import javax.swing.JInternalFrame;import java.awt.Container; /*Frame and JInternalFrame are both subclasses of Container. Both classes define a constructorthat accepts a String as a title. Both classes define a method named getTitle that returns thetitle string. */public class Q06{ public static void main(String[]args){ Foo<Frame>fFoo = new Foo<Frame>( new Frame("Frame title"));System.out.println(fFoo.get().getTitle()); displayClass(fFoo);}//end main //-------------------------------------------//static void displayClass(Foo<Container>obj){ System.out.println(obj.getClass());}//end displayClass }//end class Q06//=============================================// class Foo<T extends Container>{ private T obj;public Foo(T obj){ this.obj = obj;}//end constructor public T get(){return obj; }//end get}//end Foo //=============================================//
Figure 6 - Question 6.
Frame title class Foo

Answer 6

Figures

Listings

What is the meaning of the following two images?

These images were 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.

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 and some houses.

Answers

Answer 6

False. This program illustrates that you cannot pass an object of a parameterized class to a method that is designed to accept an incoming parameterof that class with a specific type of parameter that is a superclass of the actual type of parameter. An attempt to compile the program results in the errorshown in Figure 7 .

Figure 7 - Answer 6.
Q06.java:29: error: method displayClass in class Q06 cannot be applied to given types;displayClass(fFoo); ^required: Foo<Container>found: Foo<Frame>reason: actual argument Foo<Frame>cannot be converted to Foo<Container>by method invocation conversion 1 error

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Answer 5

False. This program illustrates that you cannot pass an object of a parameterized class to a method that is designed to accept an incoming parameterof that class with a specific type of parameter that is a superclass of the actual type of parameter. An attempt to compile the program results in the errorshown in Figure 8 .

Figure 8 - Answer 5.
Q05.java:23: error: method displayClass in class Q05 cannot be applied to given types;displayClass(iFoo); ^required: Foo<Number>found: Foo<Integer>reason: actual argument Foo<Integer>cannot be converted to Foo<Number>by method invocation conversion 1 error

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Answer 4

True. This program illustrates passing an object of a parameterized class to a method that is designed to accept an incoming parameter of that class witha specific type of parameter.

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Answer 3

True. This program illustrates passing an object of a parameterized class to a method that is designed to accept an incoming parameter of that class with aspecific type of parameter.

Back to Question 3

Answer 2

True. This program illustrates the successful use of bounded type parameters.

Back to Question 2

Answer 1

True. This program illustrates the successful use of bounded type parameters. It also illustrates the use ofautoboxing to encapsulate primitive types int and double into objects of the wrapper classesInteger and Double.

Back to Question 1

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java4250r: Review of Generics, Inheritance, and Subtypes
  • File: Java4250r.htm
  • Published: 10/20/13
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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