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This module contains review questions and answers keyed to the module titled Java4040: Purpose of Framework Implementations and Algorithms.

Revised: Tue Apr 05 15:46:03 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 Java4040: Purpose of Framework Implementations and Algorithms .

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? At least three things are included in the Java Collections Framework:

  • interfaces
  • implementations
  • algorithms

Answer 1

Question 2

True or False? The Collections Framework provides at least nine concrete implementations of the interfaces in the framework.

Answer 2

Question 3

True or False? The implementations in the Java Collections Framework are the concrete definitions of the classes that implement the core collection interfaces .

Answer 3

Question 4

True or False? Concrete implementations in the Java Collections Framework are provided by at least the following classes.

  • HashSet
  • TreeSet
  • LinkedList
  • ArrayList
  • Vector
  • HashMap
  • WeakHashMap
  • TreeMap
  • Hashtable
  • Iterator

Answer 4

Question 5

True or False? Algorithms are methods (not necessarily exposed) that provide useful capabilities, such as searching and sorting.

Answer 5

Question 6

True or False? The contract for the contains method requires that the method:

  • receives an incoming reference of type Object as a parameter
  • searches the collection looking for an element that matches the incoming reference
  • returns false if the collection on which the method is called contains the specified element and returns true otherwise.

Answer 6

Question 7

True or False? You can safely call the contains method on any object instantiated from a class that properly implements the Collection interface, even if you don't know the actual type of the collection object.

Answer 7

Question 8

True or False? When you call the contains method on a Collection object, the manner in which the search will be performed will be the same regardless of the class from which the object wasinstantiated.

Answer 8

Question 9

The program shown in Listing 1 will be used for several different questions.

Listing 1 . Used for several questions.
/*File SpeedTest01 Copyright 2001 R.G.Baldwin**************************************/ import java.util.*;public class SpeedTest01{ public static void main(String args[]){ new Worker().doIt();}//end main() }//end class SpeedTest01class Worker{ public void doIt(){int size = 2000000; //Create a TreeSet objectCollection aTree = new TreeSet(); //Populate the TreeSet object with// random values. The add() method // for a set rejects duplicates.Random rnGen = new Random(); for(int ct = 0; ct<size; ct++){ aTree.add(new Double(rnGen.nextDouble()));}//end for loop //Create and populate an ArrayList// object with the same random // valuesCollection aList = new ArrayList(aTree); //Extract a value near the center// of the ArrayList object to use // as a test case.Object testVal = ((List)aList).get(size/2); //Search for the test value in each// of the collection objects. // Measure and display the time// required to perform the search // in each case.long start = new Date().getTime(); boolean found = aList.contains(testVal);long stop = new Date().getTime(); System.out.println(found + " " + (stop - start));start = new Date().getTime(); for(int x = 0; x<100000; x++){ found = aTree.contains(testVal);}//end for loop stop = new Date().getTime();System.out.println(found + " " + (stop - start)/100000.0); }//end doIt()}// end class Worker

Questions & Answers

I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
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
How can I make nanorobot?
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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