<< Chapter < Page Chapter >> Page >
This module demonstrates runtime polymorphism using an array of an abstract type populated with references to objects of eight different subclasses of that abstract type in a format that is accessible to blind students.

Table of contents


This module is part of a collection titled Accessible Objected-Oriented Programming Concepts for Blind Students using Java . It demonstrates runtime polymorphism using an array of the abstract type AudioSignalGenerator02 populated with references to objects of eight different subclasses of AudioSignalGenerator02 in a format that is accessible to blind students.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find the listings while you are reading about them.


  • Listing 1 . Beginning of the class named MusicComposer08.
  • Listing 2 . Create and populate an array holding references to audio objects.
  • Listing 3 . Call the getMelody method on a subclass object selected at random.
  • Listing 4 . Play or file the melody.
  • Listing 5 . The class named AudioGraphSinusoidal.
  • Listing 6 . The class named AudioGraphSquareWave.
  • Listing 7 . The class named FMSweep.
  • Listing 8 . The class named MusicComposer08.
  • Listing 9 . The class named SquareWave.
  • Listing 10 . The class named StereoPingpong.
  • Listing 11 . The class named ToneMono.
  • Listing 12 . The class named TonesStereo.
  • Listing 13 . The class named WhiteNoise.
  • Listing 14 . The class named AudioFormatParameters01.
  • Listing 15 . The class named AudioPlayOrFile01.
  • Listing 16 . The class named AudioSignalGenerator02.

General background information

We have reached a plateau of sorts in our study of Java sound. This and previous modules have produced hard-coded sounds. Future modules will be moreflexible. For example, one future module will simulate a player piano. It will accept information about a melody as input data at runtime and will tailor the sound based on that information. Forexample, in future modules, you will learn to write a program to produce sounds like Greensleeves and MaryHadALittlelamb .

But I am getting ahead of myself. In previous modules, you have learned:

  • A little about the physical characteristics of sound.
  • How to produce white or pink noise.
  • How to produce square wave sound.
  • How to produce a pure sinusoidal tone.
  • How to produce an audio graph of a sinusoid.

In this module, you will learn how to produce a few more types of sounds:

  • An audio graph for a square wave.
  • A frequency-modulated sweep in stereo.
  • A stereo ping pong effect.
  • A pair of pure tones of different frequencies in stereo.

Questions & Answers

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
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?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Accessible objected-oriented programming concepts for blind students using java. OpenStax CNX. Sep 01, 2014 Download for free at https://legacy.cnx.org/content/col11349/1.17
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Accessible objected-oriented programming concepts for blind students using java' conversation and receive update notifications?