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This module contains review questions and answers keyed to the module titled Java4110: The Comparator Interface, Part 3.

Revised: Thu Apr 07 12:07:06 CDT 2016

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Table of contents

Preface

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 Java4110: The Comparator Interface, Part 3 .

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.

Questions

Question 1 .

What output is produced by the program shown in Listing 1 ?

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

Answer 1

Question 2

True or False? The fillIt method in Listing 1 populates the TreeSet object referred by the incoming parameter with the following names in the following order:

Joe Bill Tom JOE BILL TOM

Answer 2

Question 3

True or False? When the fillIt method in Listing 1 returns, the TreeSet object is populated with six names in descending order taking case into account.

Answer 3

Question 4

True or False? In the output from Listing 1 , descending order means that names beginning with letters that are low in the alphabet occur before names beginning with letters that arehigher in the alphabet. In addition, names containing lower case characters appear before the same names containing only upper case characters.

Answer 4

Question 5

True or False? In Listing 1 , names with the same spelling but different case were considered to be duplicates and therefore wereexcluded from the collection

Answer 5

Question 6

True or False? Given: Listing 1 contains the following statement:

return result*(-1);

If you were to change the value in parentheses from -1 to -2, the program output would be:

BILL Bill JOE Joe TOM Tom

Answer 6

Listings

What is the meaning of the following two images?

These images were inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.

Spacer image of a rabbit and a penguin.

This image was also inserted for the purpose of inserting space between the questions and the answers.

Spacer image of a penguin and some houses.

Answers

Answer 6

False. If you were to change the value in parentheses from -1 to -2, the program output would still be:

Tom TOM Joe JOE Bill BILL

It is the sign of the result and not the value of the result that determines the sorting order of the output in Listing 1 . You would need to multiply by a positive value to cause the output to be

BILL Bill JOE Joe TOM Tom

Back to Question 6

Answer 5

False. In Listing 1 , names with the same spelling but different case were not considered to be duplicates insofar as the contractfor the set was concerned.

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
what is titration
John Reply
what is physics
Siyaka Reply
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
David Reply
what is viscosity?
David
what is inorganic
emma Reply
what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
Sahid Reply
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
what's motion
Maurice Reply
what are the types of wave
Maurice
answer
Magreth
progressive wave
Magreth
hello friend how are you
Muhammad Reply
fine, how about you?
Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
Reofrir 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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