<< Chapter < Page Chapter >> Page >

Back to Question 10

Answer 9

True.

Back to Question 9

Answer 8

True.

Back to Question 8

Answer 7

False. An object of type Map can contain duplicate values but cannot contain duplicate keys.

Back to Question 7

Answer 6

False. An object of type SortedSet is a Set that, by default, maintains its elements in ascending order.

Back to Question 6

Answer 5

False. A SortedMap is a Map that maintains its entries in ascending order, sorted according to the keys' natural ordering,or according to a Comparator provided at the time of the SortedMap creation.

Back to Question 5

Answer 4

True.

Back to Question 4

Answer 3

True.

Back to Question 3

Answer 2

The output produced by the program in Listing 1 is shown in Figure 1 .

Figure 1 - Answer 2.
Original array contents 10 11 12 13 14 15 16 17Collection contents B0 B1 L2 B3 B4 L5New array contents B0 B1 L2 B3 B4 L5 null 17Modified array contents XX B1 L2 B3 B4 L5 null 17Collection contents XX B1 L2 B3 B4 L5

Back to Question 2

Answer 1

True.

Back to Question 1

Complete program listing

Listing 1 . ToArray02.java .
//File ToArray02.java //Copyright 2001, R.G.Baldwinimport java.util.*; import javax.swing.*;public class ToArray02{ public static void main(String args[]){ new Worker().doIt();}//end main() }//end class ToArray02//===================================// class Worker{public void doIt(){ Collection ref;//Create, populate, and display // the contents of an arrayJComponent[] array = new JComponent[8]; for(int cnt=0;cnt<8;cnt++){ array[cnt]= new JButton(); array[cnt].setToolTipText("" + (cnt+10)); }//end for loopSystem.out.println(); showArray(array,"Original array contents");//Create, populate, and display the // contents of a collectionref = new LinkedList(); Populator.fillIt(ref);showCollection(ref,"Collection contents"); //Get collection contents into the// array and display the new // contents of the array.array = (JComponent[])ref.toArray(array);showArray(array,"New array contents"); //Modify a property of an object// referred to by one of the // elements in the array. Display// array contents after // modification((JComponent)array[0]).setToolTipText("XX");showArray(array,"Modified array contents"); //Display the contents of the collectionshowCollection(ref,"Collection contents"); }//end doIt()//-----------------------------------// //Utility method for displaying// array contents void showArray(Object[]array,String title){ System.out.println(title);for(int i = 0; i<array.length;i++){ if(array[i]== null){ System.out.print("null ");}else{ System.out.print(((JComponent)array[i]). getToolTipText() + " ");}//end else }//end for loopSystem.out.println(); }//end showArray()//-----------------------------------// //Utility method for displaying// collection contents void showCollection(Collection ref,String title){System.out.println(title); Iterator iter = ref.iterator();while(iter.hasNext()){ System.out.print(((JComponent)iter.next()).getToolTipText() + " "); }//end while loopSystem.out.println(); }//end showCollection}// end class Worker //===================================//class Populator{ public static void fillIt(Collection ref){ref.add(new JButton()); ref.add(new JButton());ref.add(new JLabel()); ref.add(new JButton());ref.add(new JButton()); ref.add(new JLabel());Iterator iter = ref.iterator(); int cnt = 0;JComponent refVar; while(iter.hasNext()){refVar = (JComponent)iter.next(); if(refVar instanceof JButton){refVar.setToolTipText("B"+cnt++); }else{refVar.setToolTipText("L" + cnt++); }//end else}//end while loop }//end fillIt()}//end class Populator

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java4160r: Review
  • File: Java4160r.htm
  • Published: 12/04/13
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

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
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
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
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Object-oriented programming (oop) with java' conversation and receive update notifications?

Ask