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This module contains review questions and answers keyed to the module titled Java4140: The Comparator Interface, Part 6,

Revised: Fri Apr 08 11:14:25 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 Java4140: The Comparator Interface, Part 6 .

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 reverseOrder method of the Collections class returns a reference to an object of type String .

Answer 1

Question 2

True or False? The reverse method of the Collections class returns a reference to an object of the interface type List .

Answer 2

Question 3

True or False? A Comparator created by the reverseOrder method of the Collections class can be used to sort a list into reverse natural order .

Answer 3

Question 4

What output is produced by the program shown in Listing 1 (select one or more answers) ?

  • Compiler Error
  • Runtime Error
  • Joe Bill Tom JOE BILL TOM
  • BILL Bill JOE Joe TOM Tom
  • TOM BILL JOE Tom Bill Joe
  • Joe Bill Tom JOE TOM BILL
  • Tom TOM Joe JOE Bill BILL
  • Joe Bill Tom
  • None of the above.

Answer 4

Question 5

True or False? The ArrayList class implements both the Collection interface and the List interface. Therefore, it is both a collection and a list , and adheres to the contracts and stipulations of both interfaces.

Answer 5

Question 6

True or False? The reverseOrder method returns a Comparator that imposes the reverse of the natural ordering on a collection of objects that implement the Comparable interface.

Answer 6

Question 7

True or False? The natural ordering of the elements in a collection is the ordering imposed by the objects' own compare method.

Answer 7

Question 8

True or False? All Java objects have a natural ordering .

Answer 8

Question 9

True or False? The Comparator object returned by the reverseOrder method can be used to impose a reverse natural order on any collection of objects that implement the Comparable interface.

Answer 9

Question 10

True or False? If you don't understand interfaces, they can't possibly understand Java.

Answer 10

Question 11

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

Answer 11

Question 12

True or False? An object of type Map is an object that maps keys to values. Such an object can contain duplicate keys but cannot containduplicate values

Answer 12

Question 13

True or False? An object of type Deque allows elements to be inserted, retrieved, and removed at both ends.

Questions & Answers

Need help solving this problem (2/7)^-2
Simone Reply
what is the coefficient of -4×
Mehri Reply
the operation * is x * y =x + y/ 1+(x × y) show if the operation is commutative if x × y is not equal to -1
Alfred Reply
An investment account was opened with an initial deposit of $9,600 and earns 7.4% interest, compounded continuously. How much will the account be worth after 15 years?
Kala Reply
lim x to infinity e^1-e^-1/log(1+x)
given eccentricity and a point find the equiation
Moses Reply
12, 17, 22.... 25th term
Alexandra Reply
12, 17, 22.... 25th term
College algebra is really hard?
Shirleen Reply
Absolutely, for me. My problems with math started in First grade...involving a nun Sister Anastasia, bad vision, talking & getting expelled from Catholic school. When it comes to math I just can't focus and all I can hear is our family silverware banging and clanging on the pink Formica table.
I'm 13 and I understand it great
I am 1 year old but I can do it! 1+1=2 proof very hard for me though.
Not really they are just easy concepts which can be understood if you have great basics. I am 14 I understood them easily.
find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
If f(x) = x-2 then, f(3) when 5f(x+1) 5((3-2)+1) 5(1+1) 5(2) 10
how do they get the third part x = (32)5/4
kinnecy Reply
make 5/4 into a mixed number, make that a decimal, and then multiply 32 by the decimal 5/4 turns out to be
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
I rally confuse this number And equations too I need exactly help
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
greetings from Iran
salut. from Algeria
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
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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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