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  • add(int index, Object element)
  • get(int index)

Valid index values are positive integers that begin with zero.

Another version of the add method takes a reference to an object as an incoming parameter and appends the specified element to the end of thecollection.

Back to Question 18

Answer 17

False. Unlike collections that implement the SortedSet interface, the order of the elements in a collection that implements the List interface is not based on the values of the objects referred to by the elements in thelist.

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Answer 16

True. For example, the add method of the Set interface stipulates the following:

"Adds the specified element to this set if it is not already present."

On the other hand, the add method of the Collection interface simply states:

"Ensures that this collection contains the specified element."

Thus, the contract for the add method of an object of a class that implements the Set interface is more specialized than the contract for the add method of an object of a class that implements the Collection interface.

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Answer 15

False. You can cause the sort order to ignore case by providing an object of a class that implements the Comparator interface, and which defines the compare method and the equals method in such a way as to eliminate case considerations for comparisons of String objects.

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Answer 14

True.

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Answer 13

False. Implementations of the interface named SortedSet do maintain their elements in sorted order. However, that order is not necessarilyascending. When an object is instantiated from a class that implements the SortedSet interface, the sorting order for that object can be established by providing an object instantiated from aclass that implements the Comparator interface. In that case, the author of the class that implements the Comparator interface determines the order imposed on the elements in the collection.

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Answer 12

False. Not all implementations of the Collection interface maintain the elements in ascending sort order. Some may, and others do not. For example,implementations of the List interface (such as ArrayList ) do not maintain their elements in sorted order at all. In other words, the position of an element in an ArrayList does not depend on the value of the element.

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Answer 11

True.

Back to Question 11

Answer 10

False. An ordered collection is one in which each element in the collection has a specific position specified by an index.

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Answer 9

False. An ordered collection is not the same as a sorted collection.

Back to Question 9

Answer 8

True, according to Oracle.

Back to Question 8

Answer 7

True, according to Oracle.

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Answer 6

False.

ArrayList class: public class ArrayList<E>extends AbstractList<E>implements List<E>, RandomAccess, Cloneable, Serializable

The Java Collections Framework doesn't provide any direct implementations of the Collection interface. All of the implementations of the interfaces in the Collection hierarchy implement one of the sub-interfaces of the Collection interface. In the case of the ArrayList class, that sub-interface is the List interface, which extends the Collection interface.

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Answer 5

True.

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Answer 4

False. The TreeSet class is not a direct implementation of the Collection interface. Rather, the TreeSet class is a direct implementation of the SortedSet interface. The SortedSet interface extends the Set interface, and the Set interface extends the Collection interface.

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Answer 3

False. A Set object cannot contain duplicate elements, but a List object can contain duplicate elements.

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Answer 2

False. One of the trees, which consists of six interfaces, is rooted in the interface named Collection . The other tree, which consists of two interfaces, is rooted in the interface named Map .

Back to Question 2

Answer 1

True.

Back to Question 1

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java4060r: Review
  • File: Java4060r.htm
  • Published: 11/30/13
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

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
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
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
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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
Do you know which machine is used to that process?
s.
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
Berger describes sociologists as concerned with
Mueller Reply
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