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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.

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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

what is mutation
Janga Reply
what is a cell
Sifune Reply
how is urine form
Sifune
what is antagonism?
mahase Reply
classification of plants, gymnosperm features.
Linsy Reply
what is the features of gymnosperm
Linsy
how many types of solid did we have
Samuel Reply
what is an ionic bond
Samuel
What is Atoms
Daprince Reply
what is fallopian tube
Merolyn
what is bladder
Merolyn
what's bulbourethral gland
Eduek Reply
urine is formed in the nephron of the renal medulla in the kidney. It starts from filtration, then selective reabsorption and finally secretion
onuoha Reply
State the evolution relation and relevance between endoplasmic reticulum and cytoskeleton as it relates to cell.
Jeremiah
what is heart
Konadu Reply
how is urine formed in human
Konadu
how is urine formed in human
Rahma
what is the diference between a cavity and a canal
Pelagie Reply
what is the causative agent of malaria
Diamond
malaria is caused by an insect called mosquito.
Naomi
Malaria is cause by female anopheles mosquito
Isaac
Malaria is caused by plasmodium Female anopheles mosquitoe is d carrier
Olalekan
a canal is more needed in a root but a cavity is a bad effect
Commander
what are pathogens
Don Reply
In biology, a pathogen (Greek: πάθος pathos "suffering", "passion" and -γενής -genēs "producer of") in the oldest and broadest sense, is anything that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ. The term pathogen came into use in the 1880s.[1][2
Zainab
A virus
Commander
Definition of respiration
Muhsin Reply
respiration is the process in which we breath in oxygen and breath out carbon dioxide
Achor
how are lungs work
Commander
where does digestion begins
Achiri Reply
in the mouth
EZEKIEL
what are the functions of follicle stimulating harmones?
Rashima Reply
stimulates the follicle to release the mature ovum into the oviduct
Davonte
what are the functions of Endocrine and pituitary gland
Chinaza
endocrine secrete hormone and regulate body process
Achor
while pituitary gland is an example of endocrine system and it's found in the Brain
Achor
what's biology?
Egbodo Reply
Biology is the study of living organisms, divided into many specialized field that cover their morphology, physiology,anatomy, behaviour,origin and distribution.
Lisah
biology is the study of life.
Alfreda
Biology is the study of how living organisms live and survive in a specific environment
Sifune
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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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