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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

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit 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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