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What output is produced by the program shown in Listing 1 (select one or more answers) ?

  • A. Compiler Error
  • B. Runtime Error
  • C. Joe Bill Tom JOE BILL TOM
  • D. BILL Bill JOE Joe TOM Tom
  • E. TOM BILL JOE Tom Bill Joe
  • F. Joe Bill Tom JOE TOM BILL
  • G. Tom TOM Joe JOE Bill BILL
  • H. Joe Bill Tom
  • I. None of the above.
Listing 1 . The program named Comparator07 .
//File Comparator07.java //Copyright 2001, R.G.Baldwinimport java.util.*; public class Comparator07{public static void main(String args[]){new Worker().doIt(); }//end main()}//end class Comparator07 class Worker{public void doIt(){ Iterator iter;Collection ref; ref = new ArrayList();Populator.fillIt(ref); iter = ref.iterator();while(iter.hasNext()){ System.out.print(iter.next() + " ");}//end while loop System.out.println();Collections.reverse((List)ref); iter = ref.iterator();while(iter.hasNext()){ System.out.print(iter.next() + " ");}//end while loop System.out.println();Comparator aComparator= Collections.reverseOrder(); Collections.sort((List)ref, aComparator);iter = ref.iterator(); while(iter.hasNext()){System.out.print(iter.next() + " "); }//end while loopSystem.out.println(); }//end doIt()}// end class Worker class Populator{public static void fillIt(Collection ref){ ref.add("Joe");ref.add("Bill"); ref.add("Tom");ref.add("JOE"); ref.add("BILL");ref.add("TOM"); }//end fillIt()}//end class Populator

And the answer is ...

The correct answer to the above question is C, E, and G. The output from the program is shown below:

Joe Bill Tom JOE BILL TOM TOM BILL JOE Tom Bill JoeTom TOM Joe JOE Bill BILL

If that was your answer, you probably already understand most of the material covered in this module. In that case, you might consider skipping thismodule and moving on to the next module. If that wasn't your answer, you should probably continue with your study of this module.

Similar to previous programs

The overall structure of this program in Listing 1 is similar to programs that I have discussed in previous modules. Therefore, I will concentrateon those aspects of this program that differentiate it from the programs in previous modules.

A new ArrayList object

The code in Listing 2 instantiates a new ArrayList object and passes that object's reference to a method named fillIt where it ispopulated with the names of several people.

Listing 2 . A new ArrayList object.
ref = new ArrayList(); Populator.fillIt(ref);iter = ref.iterator();while(iter.hasNext()){ System.out.print(iter.next() + " ");}//end while loop

Displays the list contents

The code in Listing 2 also gets an iterator on the list and uses that iterator to display the contents of the populated list. At that point inthe program, the list contains the following elements in the order shown:

Joe Bill Tom JOE BILL TOM

You will recognize this as matching the order in which the elements were added to the list by the fillIt method shown in Listing 3 .

Listing 3 . The fillIt method.
class Populator{ public static void fillIt(Collection ref){ref.add("Joe"); ref.add("Bill");ref.add("Tom"); ref.add("JOE");ref.add("BILL"); ref.add("TOM");}//end fillIt() }//end class Populator

Questions & Answers

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
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
How can I make nanorobot?
Lily
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
how can I make nanorobot?
Lily
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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