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(White noise is usually thought to be noise that contains equal contributions of all frequencies. Pink noise is thought of as noise thatcontains almost equal contributions of almost all frequencies. In reality, the program that we will examine in this module will probably produce pink noiseinstead of white noise.)

Download and play the file named WhiteNoise to hear what white or pink noise sounds like. You will probably conclude that itisn't very pleasant to listen to. You should be able to play the audio file with any standard media player that can handle the AU file type. (In case you are on the OpenStax site and you are unable to download the audio file, click the Legacy Site link at the top of this page to switch over to the same module on the Legacy site. You should beable to download the audio file from there.)

Discussion and sample code

The class named AudioPlayOrFile01

A formal mechanism for code reuse

One of the most important aspects of OOP is that it provides a formal mechanism for code reuse without a requirement for the distribution of sourcecode. For example, if some other programmer

  • has developed a class (or a group of classes) that does something that you need to do, and
  • if you have confidence in that programmer, and
  • if that programmer is willing to provide you with the compiled files for those classes, then
  • you can use them in your program without knowing or caring how they are implemented.

All you need is documentation on how to use the classes.

The Java Standard edition library

The Java Standard edition library contains thousands of compiled class files that are available for every Java programmer to use whenever and wherever theyare needed. Java programmers routinely use those classes every day without knowing or caring howthey are actually implemented.

For example, the library contains a class named Random that can be used to produce a series of pseudo-random numbers. We will use that classin the program in this module. I don't know, nor do I care, how the code in that class produces the numbers. I'm confident that it behaves as advertised.Therefore, all I care about is how to use it. I can learn that from the library documentation.

Two special classes

I will provide the source code for two special classes in this module that I will use in several future modules without modification. I suggest that you simply have confidence thatthey behave as advertised and use them. I will provide very little, if any, explanation as to how they do what they do. Those classes are named

  • AudioPlayOrFile01
  • AudioFormatParameters01

The class named AudioPlayOrFile01 accepts an array of byte data as input, along with some other information, and causes electrical currentsto flow through audio speakers that are attached to the computer. A complete listing of the class named AudioPlayOrFile01 is provided in Listing 12 .

This class is very simple to use. As you can see in Listing 12 , the constructor for the class requires three parameters:

  • A reference to an object of the class AudioFormatParameters01 (see this section ) .
  • A reference to an array containing elements of type byte , which define the sound that is to be played or filed. The format of thearray will be defined later.
  • A reference to an object of type String containing either "play", which will cause the sound to be played immediately, or containing a string thatcan be used as the name of an output audio file of type AU.

Questions & Answers

the diagram of the digestive system
Assiatu Reply
How does twins formed
William Reply
They formed in two ways first when one sperm and one egg are splited by mitosis or two sperm and two eggs join together
Oluwatobi
what is genetics
Josephine Reply
Genetics is the study of heredity
Misack
how does twins formed?
Misack
What is manual
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Joseph Reply
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Yousuf Reply
the study of living organisms and their interactions with one another and their environments
AI-Robot
the study of living organisms and their interactions with one another and their environment.
Wine
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Joseph Reply
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list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
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advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
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cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
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is like gone fail us
DENG
cells is the basic structure and functions of all living things
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ISCONT Reply
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
Kenna Reply
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
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Diversity of living thing
ISCONT
what is cell division
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Cell division is the process by which a single cell divides into two or more daughter cells. It is a fundamental process in all living organisms and is essential for growth, development, and reproduction. Cell division can occur through either mitosis or meiosis.
AI-Robot
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life is defined as any system capable of performing functions such as eating, metabolizing,excreting,breathing,moving,Growing,reproducing,and responding to external stimuli.
Mohamed
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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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