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This module contains review questions and answers keyed to the module titled Java4120: The Comparator Interface, Part 4.

Revised: Thu Apr 07 13:19:31 CDT 2016

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This module is one in a collection of modules on Java Collections designed for teaching ITSE2321 - Object-Oriented Programming (Java) at Austin Community College in Austin, TX.

This module contains review questions and answers keyed to the module titled Java4120: The Comparator Interface, Part 4 .

Once you study that module, you should be able to answer the review questions in this module.

The questions and the answers in this module are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.


Question 1 .

True or False? The Collection interface declares a method named convertToArray , which can be called on a Collection object to "return an array containing all of the elements in this collection whose runtime type is that of the specified array" .

Answer 1

Question 2

True or False? A Comparator object can be used to sort the contents of an array containing references to objects.

Answer 2

Question 3

True or False? An array is a container that can be used to store a collection of primitive values or a collection of references to objects.

Answer 3

Question 4

Write down the output produced by the program shown in Listing 1 . Hint: There are ten lines of output.

Answer 4

Question 5

True or False? A Vector object is a Set object.

Answer 5

Question 6

True or False? Because a Vector object is a List object, it is not allowed to contain duplicate elements.

Answer 6

Question 7

True or False? Because a Vector is a List , it is an ordered collection.

Answer 7

Question 8

True or False? The position of each element in an ordered collection is determined by i ts value relative to the values of its neighbors.

Answer 8

Question 9

True or False? The add method for the Vector class simply adds each new element to the end of the list.

Answer 9

Question 10

True or False? When an iterator is used to traverse the elements in a Vector collection, the elements are delivered by the iterator in ascending index order, beginning with the element stored at index 0.

Answer 10

Question 11

True or False? The first time the iterator is applied to the Vector object in Listing 1 , the output is in ascending natural order as shown below:


Answer 11

Question 12

True or False? The toArray method can be called on a Vector object to return a reference to an array object containing all of the elements in the Vector in ascending index order.

Answer 12

Question 13

True or False? The documentation for the toArray method of the Collection interface reads partially as follows:

"Returns an array containing all of the elements in this collection. If the collection makes any guarantees as to what order its elements arereturned by its iterator, this method must return the elements in the same order.

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
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
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
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