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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.

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  • 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

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
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industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
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What is meant by 'nano scale'?
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scanning tunneling microscope
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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 .?
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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
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Akash Reply
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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
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