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Semester 1/Programming 1/Java/examples/projects/chapter04/music-organizer-v2/+libs/jl1.0.1.jar Executable file
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Semester 1/Programming 1/Java/examples/projects/chapter04/music-organizer-v2/MusicOrganizer.ctxt Executable file
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#BlueJ class context
comment0.params=
comment0.target=MusicOrganizer()
comment0.text=\n\ Create\ a\ MusicOrganizer\n
comment1.params=filename
comment1.target=void\ addFile(java.lang.String)
comment1.text=\n\ Add\ a\ file\ to\ the\ collection.\n\ @param\ filename\ The\ file\ to\ be\ added.\n
comment2.params=
comment2.target=int\ getNumberOfFiles()
comment2.text=\n\ Return\ the\ number\ of\ files\ in\ the\ collection.\n\ @return\ The\ number\ of\ files\ in\ the\ collection.\n
comment3.params=index
comment3.target=void\ listFile(int)
comment3.text=\n\ List\ a\ file\ from\ the\ collection.\n\ @param\ index\ The\ index\ of\ the\ file\ to\ be\ listed.\n
comment4.params=index
comment4.target=void\ removeFile(int)
comment4.text=\n\ Remove\ a\ file\ from\ the\ collection.\n\ @param\ index\ The\ index\ of\ the\ file\ to\ be\ removed.\n
comment5.params=index
comment5.target=void\ startPlaying(int)
comment5.text=\n\ Start\ playing\ a\ file\ in\ the\ collection.\n\ Use\ stopPlaying()\ to\ stop\ it\ playing.\n\ @param\ index\ The\ index\ of\ the\ file\ to\ be\ played.\n
comment6.params=
comment6.target=void\ stopPlaying()
comment6.text=\n\ Stop\ the\ player.\n
numComments=7

85
Semester 1/Programming 1/Java/examples/projects/chapter04/music-organizer-v2/MusicOrganizer.java Executable file
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import java.util.ArrayList;
/**
* A class to hold details of audio files.
* This version can play the files.
*
* @author David J. Barnes and Michael Kölling
* @version 2016.02.29
*/
public class MusicOrganizer
{
// An ArrayList for storing the file names of music files.
private ArrayList<String> files;
// A player for the music files.
private MusicPlayer player;
/**
* Create a MusicOrganizer
*/
public MusicOrganizer()
{
files = new ArrayList<>();
player = new MusicPlayer();
}
/**
* Add a file to the collection.
* @param filename The file to be added.
*/
public void addFile(String filename)
{
files.add(filename);
}
/**
* Return the number of files in the collection.
* @return The number of files in the collection.
*/
public int getNumberOfFiles()
{
return files.size();
}
/**
* List a file from the collection.
* @param index The index of the file to be listed.
*/
public void listFile(int index)
{
if(index >= 0 && index < files.size()) {
String filename = files.get(index);
System.out.println(filename);
}
}
/**
* Remove a file from the collection.
* @param index The index of the file to be removed.
*/
public void removeFile(int index)
{
if(index >= 0 && index < files.size()) {
files.remove(index);
}
}
/**
* Start playing a file in the collection.
* Use stopPlaying() to stop it playing.
* @param index The index of the file to be played.
*/
public void startPlaying(int index)
{
String filename = files.get(index);
player.startPlaying(filename);
}
/**
* Stop the player.
*/
public void stopPlaying()
{
player.stop();
}
}

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Semester 1/Programming 1/Java/examples/projects/chapter04/music-organizer-v2/MusicPlayer.ctxt Executable file
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#BlueJ class context
comment0.params=
comment0.target=MusicPlayer()
comment0.text=\n\ Constructor\ for\ objects\ of\ class\ MusicFilePlayer\n
comment1.params=filename
comment1.target=void\ playSample(java.lang.String)
comment1.text=\n\ Play\ a\ part\ of\ the\ given\ file.\n\ The\ method\ returns\ once\ it\ has\ finished\ playing.\n\ @param\ filename\ The\ file\ to\ be\ played.\n
comment2.params=filename
comment2.target=void\ startPlaying(java.lang.String)
comment2.text=\n\ Start\ playing\ the\ given\ audio\ file.\n\ The\ method\ returns\ once\ the\ playing\ has\ been\ started.\n\ @param\ filename\ The\ file\ to\ be\ played.\n
comment3.params=
comment3.target=void\ run()
comment4.params=
comment4.target=void\ stop()
comment5.params=filename
comment5.target=void\ setupPlayer(java.lang.String)
comment5.text=\n\ Set\ up\ the\ player\ ready\ to\ play\ the\ given\ file.\n\ @param\ filename\ The\ name\ of\ the\ file\ to\ play.\n
comment6.params=filename
comment6.target=java.io.InputStream\ getInputStream(java.lang.String)
comment6.text=\n\ Return\ an\ InputStream\ for\ the\ given\ file.\n\ @param\ filename\ The\ file\ to\ be\ opened.\n\ @throws\ IOException\ If\ the\ file\ cannot\ be\ opened.\n\ @return\ An\ input\ stream\ for\ the\ file.\n
comment7.params=
comment7.target=javazoom.jl.player.AudioDevice\ createAudioDevice()
comment7.text=\n\ Create\ an\ audio\ device.\n\ @throws\ JavaLayerException\ if\ the\ device\ cannot\ be\ created.\n\ @return\ An\ audio\ device.\n
comment8.params=
comment8.target=void\ killPlayer()
comment8.text=\n\ Terminate\ the\ player,\ if\ there\ is\ one.\n
comment9.params=filename
comment9.target=void\ reportProblem(java.lang.String)
comment9.text=\n\ Report\ a\ problem\ playing\ the\ given\ file.\n\ @param\ filename\ The\ file\ being\ played.\n
numComments=10

150
Semester 1/Programming 1/Java/examples/projects/chapter04/music-organizer-v2/MusicPlayer.java Executable file
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import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;
import javazoom.jl.decoder.JavaLayerException;
import javazoom.jl.player.AudioDevice;
import javazoom.jl.player.FactoryRegistry;
import javazoom.jl.player.advanced.AdvancedPlayer;
/**
* Provide basic playing of MP3 files via the javazoom library.
* See http://www.javazoom.net/
*
* @author David J. Barnes and Michael Kölling
* @version 2016.02.29
*/
public class MusicPlayer
{
// The current player. It might be null.
private AdvancedPlayer player;
/**
* Constructor for objects of class MusicFilePlayer
*/
public MusicPlayer()
{
player = null;
}
/**
* Play a part of the given file.
* The method returns once it has finished playing.
* @param filename The file to be played.
*/
public void playSample(String filename)
{
try {
setupPlayer(filename);
player.play(500);
}
catch(JavaLayerException e) {
reportProblem(filename);
}
finally {
killPlayer();
}
}
/**
* Start playing the given audio file.
* The method returns once the playing has been started.
* @param filename The file to be played.
*/
public void startPlaying(final String filename)
{
try {
setupPlayer(filename);
Thread playerThread = new Thread() {
public void run()
{
try {
player.play(5000);
}
catch(JavaLayerException e) {
reportProblem(filename);
}
finally {
killPlayer();
}
}
};
playerThread.start();
}
catch (Exception ex) {
reportProblem(filename);
}
}
public void stop()
{
killPlayer();
}
/**
* Set up the player ready to play the given file.
* @param filename The name of the file to play.
*/
private void setupPlayer(String filename)
{
try {
InputStream is = getInputStream(filename);
player = new AdvancedPlayer(is, createAudioDevice());
}
catch (IOException e) {
reportProblem(filename);
killPlayer();
}
catch(JavaLayerException e) {
reportProblem(filename);
killPlayer();
}
}
/**
* Return an InputStream for the given file.
* @param filename The file to be opened.
* @throws IOException If the file cannot be opened.
* @return An input stream for the file.
*/
private InputStream getInputStream(String filename)
throws IOException
{
return new BufferedInputStream(
new FileInputStream(filename));
}
/**
* Create an audio device.
* @throws JavaLayerException if the device cannot be created.
* @return An audio device.
*/
private AudioDevice createAudioDevice()
throws JavaLayerException
{
return FactoryRegistry.systemRegistry().createAudioDevice();
}
/**
* Terminate the player, if there is one.
*/
private void killPlayer()
{
synchronized(this) {
if(player != null) {
player.stop();
player = null;
}
}
}
/**
* Report a problem playing the given file.
* @param filename The file being played.
*/
private void reportProblem(String filename)
{
System.out.println("There was a problem playing: " + filename);
}
}

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Semester 1/Programming 1/Java/examples/projects/chapter04/music-organizer-v2/README.TXT Executable file
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Project: music-organizer-v2. A project to collect audio files.
Authors: David J. Barnes and Michael Kölling
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
Sixth edition
David J. Barnes and Michael Kölling
Pearson Education, 2016
It is discussed in chapter 4.
To start:
Create a MusicOrganizer object on the object bench.
Use its methods to add, remove, and play files.

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Semester 1/Programming 1/Java/examples/projects/chapter04/music-organizer-v2/package.bluej Executable file
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#BlueJ package file
dependency1.from=MusicOrganizer
dependency1.to=MusicPlayer
dependency1.type=UsesDependency
objectbench.height=76
objectbench.width=755
package.editor.height=385
package.editor.width=647
package.editor.x=70
package.editor.y=80
package.numDependencies=1
package.numTargets=2
package.showExtends=true
package.showUses=true
project.charset=UTF-8
readme.editor.height=652
readme.editor.width=874
readme.editor.x=41
readme.editor.y=23
target1.editor.height=700
target1.editor.width=900
target1.editor.x=76
target1.editor.y=35
target1.height=60
target1.name=MusicPlayer
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=130
target1.x=310
target1.y=210
target2.editor.height=699
target2.editor.width=758
target2.editor.x=529
target2.editor.y=23
target2.height=60
target2.name=MusicOrganizer
target2.naviview.expanded=false
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=130
target2.x=150
target2.y=110