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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

Back to Question 6

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

Back to Question 5

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.

Back to Question 4

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

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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