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This module contains review questions and answers keyed to the module titled Java4050: Core Collection Interfaces.

Revised: Wed Apr 06 08:58:40 CDT 2016

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Table of contents

Preface

This module contains review questions and answers keyed to the module titled Java4050: Core Collection Interfaces .

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

Questions

Question 1 .

The program in Listing 1 may be referred to by several different questions.

Listing 1 . Program named Ap401.
import java.util.TreeSet; import java.util.ArrayList;import java.util.Collection; import java.util.Iterator;public class Ap401{ public static void main(String args[]){ new Worker().doIt();}//end main() }//end class Ap401class Worker{ public void doIt(){Collection ref = new TreeSet(); Populator.fillIt(ref);Iterator iter = ref.iterator(); while(iter.hasNext()){System.out.print(iter.next()); }//end while loopSystem.out.print(" "); ref = new ArrayList();Populator.fillIt(ref); iter = ref.iterator();while(iter.hasNext()){ System.out.print(iter.next());}//end while loop System.out.println();}//end doIt() }// end class Workerclass Populator{ public static void fillIt(Collection ref){ref.add(new Integer(4)); ref.add(new Integer(4));ref.add(new Integer(3)); ref.add(new Integer(2));ref.add(new Integer(1)); }//end fillIt()}//end class populator

Which of the following does Listing 1 produce as an output?

  • 44321 44321
  • 12344 12344
  • 1234 44321
  • 1234 4321

Answer 1

Question 2

True or False? The basic purpose of the core collection interfaces in the Java Collections Framework is to allow collections to be manipulatedwithout regard for how the collections are implemented.

Answer 2

Question 3

True or False? There is only one way to implement a list.

Answer 3

Question 4

True or False? If two lists are implemented in different ways, but both satisfy the requirements of the core collection interfaces, they can each bemanipulated the same way regardless of the details of their implementation.

Answer 4

Question 5

True or False? A collection of type TreeSet and a collection of type ArrayList are instantiated in the program in Listing 1 . Each of the collections is viewed as being of the interface type Collection .

Answer 5

Question 6

True or False? Given the TreeSet and ArrayList classes, only the TreeSet class implements the Collection interface. (See the Java documentation.)

Answer 6

Question 7

True or False? Both the TreeSet class and the ArrayList class inherit an abstract method named add from the Collection interface.

Answer 7

Question 8

True or False? Given that both the TreeSet class and the ArrayList class inherit an abstract method named add from the Collection interface, each class is required to define a concrete version of the add method with the same behavior.

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
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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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