SOURCE CODE:

public class Tunes {

public static void main(String[] args) {

// TODO Auto-generated method stub

CDCollection music = new CDCollection ();

music.addCD("Storm Front", "Billy Joel", 14.95, 10);

music.addCD("Come On Over", "Shania Twain", 14.95, 16);

music.addCD("Soundtrack", "Les Miserables", 17.95, 33);

music.addCD("Graceland", "Paul Simon", 13.90, 11);

System.out.println(music);

music.addCD("Double Live", "Garth Brooks", 19.99, 26);

music.addCD("Greatest Hits", "Jimmy Buffet", 15.95, 13)

System.out.println(music);

}

import java.text.NumberFormat;

public class CDCollection

{

private CD[] collection;

private int count;

private double totalCost;

public CDCollection()

{

collection = new CD[100];

count = 0;

totalCost = 0.0;

}

public void addCD(String title, String artist, double cost,

int tracks)

{

if (count == collection.length)

increaseSize();

collection[count] = new CD(title, artist, cost, tracks);

totalCost += cost;

count++;

}

public String toString()

{

NumberFormat fmt = NumberFormat.getCurrencyInstance();

String report = "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ";

report += "My CD Collection ";

report += "Number of CDs: " + count + " ";

report += "Total cost: " + fmt.format(totalCost) + " ";

report += "Average cost: " + fmt.format(totalCost/count);

report += " CD List: ";

for (int cd = 0; cd < count; cd++)

report += collection[cd].toString() + " ";

return report;

}

private void increaseSize()

{

CD[] temp = new CD[collection.length * 2];

for (int cd = 0; cd < collection.length; cd++)

temp[cd] = collection[cd];

collection = temp;

}

public String getTitle()

{

return title;

}

import java.text.NumberFormat;

public class CD

{

private String title, artist;

private double cost;

private int tracks;

public CD(String name, String singer, double price, int numTracks)

{

title = name;

artist = singer;

cost = price;

tracks = numTracks;

}

public String toString()

{

NumberFormat fmt = NumberFormat.getCurrencyInstance();

String description;

description = fmt.format(cost) + "\t" + tracks + "\t";

description += title + "\t" + artist;

return description;

}

}

I need to make these modifications:

Arrays of objects are a difficult topic at first. In this lab, you will be changing code in programs discussed in Chapter Seven (Section 7.3 Arrays of Objects). I have provided snippet of code in some cases to simplify, but it is essentially the same. This is the example program starting with Listing 7-7 in book.

Use the 3 files attached to this lab for these changes.

Run Tunes.java to view the output.

(5 points)

Add two more cds of your choice to the collection. Print out again.

----------------------------------------------------------------------------------------------------------------------------------

Create a int variable index in Tunes.java. This value will be used to get one title from the collection.

------------------------------------------------------------------------------

Add this code to CD.java (a getter):

(2 points)

public String getTitle()

{

return title;

}

------------------------------------------------------------------------------

Add this code to CDCollection.java:

(2 points)

public String findTitle (int i)

{

return (collection[i].getTitle());

}

-----------------------------------------------------------------------------

Add this code to Tunes.java:

(10 points)

Using a loop to allow user to enter 0 thru number of CDs Added to select and list/display a Title of CD in the list. (example below is using the number entered called index)

If value entered is valid then do this line of code System.out.println(music.findTitle(index));

Index is used as the value entered, if value entered not valid try again. Allow loop to end!

If the value = 1, then Come on Over will displayed.

--------------------------------------------------------------------------------------------------------------------------------

(15 points)

Add the code to add up the costs in the collection and display the value. Yes, there is already a totalCost but do this for 15 points. All three java classes need code added, code not completely given like above so THINK!

Place this code in a for loop in CDCollection.java and add the necessary code to the other two java files shown below. This will be similar to what you did in bullet 2 above. Also look at the for loop in toString()

total = total + (collection[cd].getCost());

In Tunes.java will ask for the total and print the total at end of program Total cost for collection:

In CD.java will give the the cost hence [hint:] getCost()

--------------------------------------------------------------------------------------------------------------------------------

(6 points)

(3 pts) Write a method to find most expensive CD.

(3 pts) Write a method to find CD with most tracks

Print out results.

(10 points)

Modify current output and add prints. Program works!

-------------------------------------

My CD Collection

Number of CDs: 4

Total Cost: $61.75

Average Cost: $15.44

CD Listing:

$14.95 10 Storm Front Billy Joel

$14.95 16 Come on Over Shania Twain

$17.95 33 SoundTrack Les Miserables

$13.90 11 GraceLand Paul Simon

-------------------------------------

My CD Collection

Number of CDs: 6

Total Cost: $97.69

Average Cost: $16.28

CD Listing:

$14.95 10 Storm Front Billy Joel

$14.95 16 Come on Over Shania Twain

$17.95 33 SoundTrack Les Miserables

$13.90 11 GraceLand Paul Simon

$19.99 26 Double Live Garth Brooks

$15.95 13 Greatest Hits Jimmy Buffet

-------------------------------------

My CD Collection

Number of CDs: 8

Total Cost: $134.59

Average Cost: $16.82

CD Listing:

$14.95 10 Storm Front Billy Joel

$14.95 16 Come on Over Shania Twain

$17.95 33 SoundTrack Les Miserables

$13.90 11 GraceLand Paul Simon

$19.99 26 Double Live Garth Brooks

$15.95 13 Greatest Hits Jimmy Buffet

$16.95 10 Divide Ed Sheeran

$19.95 12 Reputation Taylor Swift

enter number (-1 to quit) :

9

not valid, try again

enter number (-1 to quit) :

5

Greatest Hits

enter number (-1 to quit) :

3

GraceLand

enter number (-1 to quit) :

2

SoundTrack

enter number (-1 to quit) :

2

SoundTrack

enter number (-1 to quit) :

-1

Total cost for collection is: 134.59

Most expensive cd: Double

CD with most tracks: SoundTrack

The end folks!