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This module contains review questions and answers keyed to the module titled Java4160: The toArray Method, Part 2.

Revised: Fri Apr 08 13:36:43 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 Java4160: The toArray Method, Part 2 .

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 .

True or False? The Collection interface declares the following two versions of the toArray method (with generics syntax omitted because generics is beyond the scope of this course) .

public Object[] toArray()

public Object[] toArray(Object[]a)

Answer 1

Question 2

Write down the output produced by the program shown in Listing 1 .

Answer 2

Question 3

True or False? The Collections class (as opposed to the Collection interface) , provides static methods that operate on collections.

Answer 3

Question 4

True or False? TreeSet is a class in the Java Collections Framework .

Answer 4

Question 5

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 5

Question 6

True or False? An object of type SortedSet is a Set that, by default, maintains its elements in descending order.

Answer 6

Question 7

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 7

Question 8

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

Answer 8

Question 9

True or False? Objects of type List allow duplicates..

Answer 9

Question 10

True or False? Objects of type Set allow duplicates..

Answer 10

Question 11

True or False? Set is an interface in the Collections Framework .

Answer 11

Question 12

True or False? Collection is the class that forms the root of the Collections Framework hierarchy.

Answer 12

Figures

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 12

False. Collection is an interface, not a class.

Back to Question 12

Answer 11

True.

Back to Question 11

Answer 10

False. Objects of type Set do not allow duplicates.

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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