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However, the software designer does need to know the tradeoffs among the various types of collection objects in terms of their operational behavior.

Modern CS2 students should be learning about the performance and operational differences among the different types of collections, and how to use availableframeworks to create and use those collections. They should not be wasting their time learning how to reinvent them. They have more important ways to spend theirtime, and they have more important things to learn.

An analogy

Frankly, I don't care how the programmers at Sun implemented the TreeSet class, so long as the behavior of objects instantiated from that class meets thepublished specifications.

As an analogy, I also don't care how they implemented the Random class, so long as objects instantiated from the Random class provide the pseudo random values that I need in my programs.

I see no conceptual differences between the TreeSet class and the Random class from a software reuse viewpoint.

  • I can instantiate an object of the Random class to produce pseudo random values, without caring how those values are actually generated.However, if I am working in cryptography, I might need to know how many such values can be generated before the sequence repeats.
  • I can use any of the thirty or so methods of the Math class to produce a variety of complex mathematical values without caring about howthose values are actually produced. However, since many of those values are approximations, I might need to know something about the quality of theapproximation.
  • I can instantiate an object of the TreeSet class to create a collection object that guarantees that the sorted set will be in ascendingelement order, and provide log(n) time cost for the basic operations of add , remove , and contains . As long as I know that, I have very little need to know exactly how the collection object is implemented.

Its time to reinvent the CS2 curriculum

Having worked for 32 years in high-tech industry before becoming a college professor, I'm confident that the future employers of most students share my opinion onthis. I don't know of any employer who wants their programmers to spend time and dollars reinventing the classical data structures. What those employers arelooking for is a staff of programmers who understand the tradeoffs among the data structures, and when it is appropriate to use each of the differentstructures.

It is time to reinvent the curriculum in CS2 courses by

  • Encouraging the understanding of techniques for software reuse.
  • Teaching when, why, and how each of the different structures should be used.
  • Discouraging the reinvention of those structures.

Run the program

Okay, I will step down from my soapbox. I encourage you to copy the code from Listing 6 and paste it into your text editor. Thencompile and execute it.

Run the program and observe the results. Experiment with the code. Make changes, run the program again, and observe the results of your changes. Make certain that youcan explain why your changes behave as they do.

Questions & Answers

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 ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
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.
Harper
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
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
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
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
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
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
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali 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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