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This module contains review questions and answers related to generics, inheritance, and subtypes in Java.

Revised: Wed May 11 18:13:42 CDT 2016

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This module is one in a collection of modules on Java Generics designed for teaching ITSE2317 - Java Programming (Intermediate) at Austin Community College in Austin, TX.

This and future modules in this series will be based on the Generics (Updated) section of The Java Tutorials from Oracle. (In the event that these links become broken, you should have no difficulty finding the Oracle material with an online search.)

You will find the learning resources for this module on the Oracle site at Generics, Inheritance, and Subtypes .

This module contains review questions and answers keyed to the material in that document.

Once you study that material, you should be able to answer the review questions in this module.

Once you complete your study of all the material on generics , you should be able to answer the review questions at Questions and Exercises on the Oracle site.

The questions and the answers in this module are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.


Question 1 .

True or False: The code shown in Listing 1 will compile and run successfully producing the output shown in Figure 1 .

Listing 1 - Question 1.
/*File Q01.java ************************************************//* Integer and Double are both subclasses ofNumber. Both classes define a method named doubleValue that returns the encapsulatednumeric value as type double. */public class Q01{ public static void main(String[]args){ Foo<Integer>iFoo = new Foo<Integer>(15); System.out.println(iFoo.get().doubleValue());Foo<Double>dFoo = new Foo<Double>(1.0/3); System.out.println(dFoo.get().doubleValue());}//end main }//end class Q01//=============================================// 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 1 - Question 1.
15.0 0.3333333333333333

Answer 1

Question 2

True or False: The code shown in Listing 2 will compile and run successfully producing the output shown in Figure 2 .

Listing 2 - Question 2.
/*File Q02.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 Q02{ public static void main(String[]args){ Foo<Frame>fFoo = new Foo<Frame>( new Frame("Frame title"));System.out.println(fFoo.get().getTitle()); Foo<JInternalFrame>jFoo = new Foo<JInternalFrame>( new JInternalFrame("JInternalFrame title")); System.out.println(jFoo.get().getTitle());}//end main }//end class Q02//=============================================// 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 //=============================================//

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
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
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
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