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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.

Back to Question 16

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.

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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.

Back to Question 7

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.

Back to Question 6

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.

Back to Question 4

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

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
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
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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