In Java, You will be implementing the Singleton Design Pattern to create a Jukebox.

JukeBox Class:

This is your singleton, you are only able to make one jukebox.

You will create an ArrayList of all the songs in the jukebox

You will create a Queue to hold the songs requested.

In the JukeBox's private constructor:

Read in all of the songs from the DataLoader to create the ArrayList of songs.

when you call playNextSong(), return:

Let's jam to , or

You need to add songs to the list

When you call requestSong:

if is in the ArrayList of songs then return:

is now number on the list

Otherwise return Sorry we do not have the song

When you call hasMoreSongs:

returns true or false accordingly

MusicDriver:

The driver will create a JukeBox

Request songs

play next song

DataLoader.Java:

package singleton;

import java.io.File;

import java.io.FileNotFoundException;

import java.util.ArrayList;

import java.util.Scanner;

/**

* Used to read data from text files

*/

public class DataLoader {

// relative path to the file, based on the directory you currently have open

private static final String FILE_NAME = "singleton/songs.txt";

/**

* Returns a list of all songs from the text file

*

* @return An ArrayList of Songs

*/

public static ArrayList getSongs() {

ArrayList songs = new ArrayList();

try {

File file = new File(FILE_NAME);

Scanner scanner = new Scanner(file);

// loop through to get each question

while (scanner.hasNextLine()) {

String[] data = scanner.nextLine().split("-");

String title = data[0].trim();

String artist = data[1].trim();

Song song = new Song(title, artist);

songs.add(song);

}

scanner.close();

} catch (FileNotFoundException e) {

System.out.println("Sorry, we could not properly read the songs file");

e.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

}

return songs;

}

}

MuiscDriver.java

package singleton;

public class MusicDriver {

public static void main(String[] args) {

JukeBox jukeBox = JukeBox.getInstance();

System.out.println();

// Holds the list of all the songs we want to add to the jukebox

String[] myFavSongs = { "Hey Jude", "Baby Shark", "Dancing Queen", "Stand By Me", "No Woman No Cry", "YMCA",

"My Generation" };

// loops through and attempst to add songs to the jukebox

System.out.println("Entering our songs");

for (String song : myFavSongs) {

System.out.println(jukeBox.requestSong(song));

}

// prints the songs as they are played

System.out.println(" Playing our songs");

while (jukeBox.hasMoreSongs()) {

System.out.println(jukeBox.playNextSong());

}

}

}

output.txt:

Entering our songs Hey Jude is now number 1 on the list Sorry, we do not have the song Baby Shark Dancing Queen is now number 2 on the list Stand By Me is now number 3 on the list No Woman No Cry is now number 4 on the list Sorry, we do not have the song YMCA My Generation is now number 5 on the list

Playing our songs Let's jam to Hey Jude by The Beatles Let's jam to Dancing Queen by ABBA Let's jam to Stand By Me by Ben E King Let's jam to No Woman No Cry by Bob Marley Let's jam to My Generation by The Who

songs.txt:

Smells Like Teen Spirit - Nirvana Imagine - John Lennon One - U2 Billie Jean - Michael Jackson Bohemian Rhapsody - Queen Hey Jude - The Beatles Like A Rolling Stone - Bob Dylan I Can't Get No Satisfaction - Rolling Stones God Save The Queen - Sex Pistols Sweet Child O'Mine - Guns N' Roses London Calling - The Clash Waterloo Sunset - The Kinks Hotel California - The Eagles Your Song - Elton John Stairway To Heaven - Led Zeppelin The Twist - Chubby Checker Live Forever - Oasis I Will Always Love You - Whitney Houston Life On Mars? - David Bowie Heartbreak Hotel - Elvis Presley Over The Rainbow - Judy Garland What's Goin' On - Marvin Gaye Born To Run - Bruce Springsteen Be My Baby - The Ronettes Creep - Radiohead Bridge Over Troubled Water - Simon & Garfunkel Respect - Aretha Franklin Family Affair - Sly And The Family Stone Dancing Queen - ABBA Good Vibrations - The Beach Boys Purple Haze - Jimi Hendrix Yesterday - The Beatles Jonny B Good - Chuck Berry No Woman No Cry - Bob Marley Hallelujah - Jeff Buckley Every Breath You Take - The Police A Day In The Life - The Beatles Stand By Me - Ben E King Papa's Got A Brand New Bag - James Brown Gimme Shelter - The Rolling Stones What'd I Say - Ray Charles Sultans Of Swing - Dire Straits God Only Knows - The Beach Boys You've Lost That Lovin' Feeling - The Righteous Brothers My Generation - The Who Dancing In The Street - Martha Reeves and the Vandellas When Doves Cry - Prince A Change Is Gonna Come - Sam Cooke River Deep Mountain High - Ike and Tina Turner Best Of My Love - The Emotions

UML: