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The instance variable named melody will ultimately refer to an array object that holds the audio data that will be played or filed.

The instance variable named args will ultimately refer to an array object that holds an incoming command-line parameter.

Command-line parameters

Only one command-line parameter is needed and it is optional. If the value of the parameter is "play", the sound will be played immediately. Otherwise, theparameter string will be used as a filename for an audio file of type AU. In this case,it must be a string that would be valid as a file name for your operating system.

The main method

The main method simply instantiates a new object of this class passing the incoming args array's reference to the constructor.

Compiling and executing the program

I typically use Windows batch files to compile and execute my Java program. Listing 2 shows the contents of such a batch file. This batch file will attempt to:

  • Delete all class files in the folder.
  • Delete a file named WhiteNoise.au if it exists.
  • Compile the program.
  • Execute the program once to play the sound immediately.
  • Execute the program again to write the sound to the audio file named WhiteNoise.au.
  • Delete all the class files in the folder.
Listing 2 . The file named WhiteNoise.bat.
echo off del *.classdel WhiteNoise.au echo onjavac MusicComposer04.java java MusicComposer04 playjava MusicComposer04 WhiteNoise echo offdel *.class pause

The constructor for MusicComposer04

Listing 3 shows the beginning of the constructor for MusicComposer04 .

Listing 3 . Beginning of the constructor for MusicComposer04.
public MusicComposer04(String[] args){//constructorthis.args = args;//Create default args data if no args data is provided on the command line. if(args.length == 0){this.args = new String[1];this.args[0] = "play";//Play the melody immediately}//end if

The constructor begins by saving the incoming reference to the args array containing the command-line parameter.

If the length of the args array is zero, this means that the user did not enter a command-line parameter. In that case, the constructor instantiates an appropriate arrayobject, populates its only element with a reference to a "play" string, and saves that array object's reference in the instance variable discussed earlier .

Get and play or file the sound

Listing 4 instantiates a new object of the WhiteNoise class and saves the object's reference in a local reference variable of type WhiteNoise named whiteNoise . You are already familiar with the three parameters that are passed to the constructor for the WhiteNoise class.

(Later when we discuss runtime polymorphism, we will save such an object's reference in a reference variable of type AudioSignalGenerator02 , which is the immediate superclass of the WhiteNoise class.)

Listing 4 . Get and play or file the sound.
//Get a populated array containing audio data for white or pink noise. WhiteNoise whiteNoise = new WhiteNoise(audioParams,this.args,melody);melody = whiteNoise.getMelody(); //Play or file the audio datanew AudioPlayOrFile01(audioParams,melody,this.args[0]).playOrFileData();}//end constructor //-------------------------------------------------------------------------//}//end class MusicComposer04.java

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
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.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
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
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit 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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