Please assist me to implement these mp3player methods

[Ms_mary10]

The user needs to be able to:

* Create playlists
* Delete playlists
* Edit playlists
* play playlists
The methos are in Mp3playerImpl and PlayListImpl


com.xxx.iopackage.inputstreams.mp3player.playlist.PlayList
com.xxx.iopackage.inputstreams.mp3playerMp3Player

com.xxx.iopackage.inputstreams.mp3player.playlist.PlayListImpl
com.xxx.iopackage.inputstreams.mp3playerMp3PlayerImpl


mp3player

package com.xxx.iopackage.inputstreams.mp3player;

import java.io.File;
import java.util.List;

import com.xxx.iopackage.inputstreams.mp3player.playlist.PlayList;

/**
* Models a mp3 player
*
*/
public interface Mp3Player {

/**
* Plays an Mp3 file
*
* @param mp3File
*/
public void play( File mp3File );


/**
* Adds a mp3 to the playlist
*
* @param playList
* @param mp3File
*/
public void addToPlayList( PlayList playList, File mp3File );

/**
* Creates a playlist
*
* @param playListName
* @return
*/
public PlayList createPlayList( String playListName );

/**
* Stores a playlist to the file system
*
* @param playList the playlist to store
*/
public void storePlayList( PlayList playList );

/**
* Removes a playlist from the file system
*
* @param playList
*/
public void removePlayList( PlayList playList );


/**
* Removes a playlist from the file system
*
* @param playListName
*/
public void removePlayList( String playListName );


/**
* Returns all the playlists saved to the file system
*
* @return all playlists saved to the file system
*/
public List<PlayList> getPlayLists();



/**
* Plays a playlist
*/
public void playPlayList();


/**
* Shows the main menu
*/
public void showMainMenu();

/**
* Shows an error to the console
*
* @param message error message to show to the console
*/
public void showError( String message );
}





Mp3PlayerImpl.java

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.List;

import javazoom.jl.decoder.JavaLayerException;
import javazoom.jl.player.Player;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;

import com.xxx.iopackage.inputstreams.mp3player.gui.AbstractCommandlineGui;
import com.xxx.iopackage.inputstreams.mp3player.playlist.PlayList;

public class Mp3PlayerImpl extends AbstractCommandlineGui
implements Mp3Player {

public static final Logger logger =
Logger.getLogger( Mp3PlayerImpl.class );


/**
* Constructor
*/
public Mp3PlayerImpl() {

super();
}


/**
* Shows the Play Mp3 Menu
*/
private void showPlayMp3Menu() {

boolean stay = true;

while ( stay ) {
StringBuffer sb = new StringBuffer( LINE_SEPARATOR );
sb.append( LINE_SEPARATOR );
sb.append( "Select MP3" );
sb.append( LINE_SEPARATOR );
sb.append( "==========" );
sb.append( LINE_SEPARATOR );
sb.append( "Please enter the path of a mp3 to play or x to exit" );

System.out.println( sb.toString() );

String pathToMp3 = readInput();

if ( pathToMp3.equals( "x" ) ) {

stay = false;
break;
}

File mp3File = new File( pathToMp3 );
sb = new StringBuffer();

while ( stay ) {

if ( ! mp3File.exists() ) {

sb.append( LINE_SEPARATOR );

sb.append(
"Could not find mp3. Please enter a correct " +
"path or x to exit" );

System.out.println( sb.toString() );

pathToMp3 = readInput();

if ( pathToMp3.equals( "x" ) ) {
stay = false;
break;
}
}
else {

play( mp3File );

break;
}
}
}

}


public void addToPlayList( PlayList playList, File mp3File ) {

// YOU NEED TO IMPLEMENT THIS METHOD
}

public PlayList createPlayList( String playListName ) {

// YOU NEED TO IMPLEMENT THIS METHOD
return null;
}



public List<PlayList> getPlayLists() {

// YOU NEED TO IMPLEMENT THIS METHOD
return null;
}


public void playPlayList() {

// YOU NEED TO IMPLEMENT THIS METHOD
}


public void removePlayList( PlayList playList ) {

// YOU NEED TO IMPLEMENT THIS METHOD
}


public void removePlayList( String playListName ) {

// YOU NEED TO IMPLEMENT THIS METHOD
}


public void storePlayList( PlayList playList ) {

// YOU NEED TO IMPLEMENT THIS METHOD
}


public void showMainMenu() {

// YOU NEED TO IMPLEMENT THIS METHOD

while ( true ) {

StringBuffer sb = new StringBuffer( LINE_SEPARATOR );
sb.append( LINE_SEPARATOR );
sb.append( "Menu" );
sb.append( LINE_SEPARATOR );
sb.append( "====" );
sb.append( LINE_SEPARATOR );
sb.append( "1. Play Mp3" );
sb.append( LINE_SEPARATOR );
sb.append( "2. Exit" );
sb.append( LINE_SEPARATOR );
sb.append( LINE_SEPARATOR );
sb.append( "Please enter a number for a menu option? " );

System.out.println( sb.toString() );

String menuOption = readInput();

if ( menuOption.equals( "1" ) ) {

showPlayMp3Menu();
}
else {

break;
}
}
}


public void showError( String message ) {

logger.error( message );
}


public void play( File mp3File ) {

final String pathToMp3File = mp3File.getAbsolutePath();

try {
FileInputStream fileInputStream =
new FileInputStream( mp3File );

BufferedInputStream bufferedInputStream =
new BufferedInputStream( fileInputStream );

Player player = new Player( bufferedInputStream );

player.play();
}
catch( FileNotFoundException e ) {

showError( "Could not find mp3 to play : " + pathToMp3File );
}
catch( JavaLayerException e ) {

showError( "Problem initializing player with mp3 file, " +
pathToMp3File );
}

}


/**
* Entry point to this application.
*
* @param args path to mp3
*/
public static void main( String[] args ) {

BasicConfigurator.configure();

Mp3Player mp3Player = new Mp3PlayerImpl();

String pathToMp3;

if (args.length > 0 ) {

pathToMp3 = args[ 0 ];
mp3Player.play( new File( pathToMp3 ) );
}
else {

mp3Player.showMainMenu();

System.out.println( "Goodbye!" );
}
}
}




PlayList.java


package com.xxx.iopackage.inputstreams.mp3player.playlist;

import java.io.File;
import java.util.LinkedHashSet;


/**
* Models a playlist of MP3. A Playlist is a group of mp3s which are played
* one after another.
*/
public interface PlayList {

/**
* Adds a mp3 to the playlist
*
* @param mp3
*/
public void addMp3( File mp3 );


/**
* Gets the Mp3 as a LinkedHashSet. A LinkedHashSet returns the elements
* in the order they were added to the LinkedHashSet
*
* @return list of Mp3 for this playlist
*/
public LinkedHashSet<File> getMp3PlayList();


/**
* Removes a mp3 from the playlist
*
* @param mp3 the mp3 to remove from the playlist
*/
public void removeFromPlayList( File mp3 );


/**
* Removes all mp3 from the playlist
*/
public void removeAllMp3FromPlaylist();


/**
* Sets the name of the mp3 playlist
*
* @param playListName the name of the playlist
*/
public void setName( String playListName );


/**
* Gets the name of the mp3 playlist
*
* @return the name of the mp3 playlist
*/
public String getPlayListName();
}






PlayListImpl.java


package com.xxx.iopackage.inputstreams.mp3player.playlist;

import java.io.File;
import java.util.LinkedHashSet;

/**
* Class modelling a playlist of Mp3 tunes
*
*/
public class PlayListImpl implements PlayList {

/**
* Constructor
*/
public PlayListImpl() {

super();
}

/* (non-Javadoc)
* @see com.xxx.iopackage.inputstreams.mp3player.playlist.
* PlayList#addMp3(java.io.File)
*/
public void addMp3( File mp3 ) {

// YOU NEED TO IMPLEMENT THIS METHOD
}


/* (non-Javadoc)
* @see com.xxx.iopackage.inputstreams.mp3player.playlist.
* PlayList#getMp3PlayList()
*/
public LinkedHashSet<File> getMp3PlayList() {

// YOU NEED TO IMPLEMENT THIS METHOD
return null;
}


/* (non-Javadoc)
* @see com.xxx.iopackage.inputstreams.mp3player.playlist.
* PlayList#getPlayListName()
*/
public String getPlayListName() {

// YOU NEED TO IMPLEMENT THIS METHOD
return null;
}


/* (non-Javadoc)
* @see com.xxx.iopackage.inputstreams.mp3player.playlist.
* PlayList#removeAllMp3FromPlaylist()
*/
public void removeAllMp3FromPlaylist() {

// YOU NEED TO IMPLEMENT THIS METHOD
}


/* (non-Javadoc)
* @see com.xxx.iopackage.inputstreams.mp3player.playlist.
* PlayList#removeFromPlayList(java.io.File)
*/
public void removeFromPlayList( File mp3 ) {

// YOU NEED TO IMPLEMENT THIS METHOD
}


/* (non-Javadoc)
* @see com.xxx.iopackage.inputstreams.mp3player.playlist.
* PlayList#setName(java.lang.String)
*/
public void setName( String playListName ) {

// YOU NEED TO IMPLEMENT THIS METHOD
}
}

[servlet]

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