Create the new class called Song.java using the given class diagram. There is no
ID: 3764183 • Letter: C
Question
Create the new class called
Song.java
using the given class diagram.
There is no default constructor, only the one sending in both title and artist.
toString
-
define it so that it prints in the form:
title
by
artist
2.
Write the code
for menu choice 2
to print the
array
to the screen.
Doing this
at the beginning allows you to test that the array has the correct values
whenever a change has been made to it.
You have been given the declarations for:
MAX_ARRAY_SIZE
FILEN
AME
count
(used to keep track of the number of elements currently in the array)
choice (used to capture the menu choice made by the user)
3
.
Write the prompt and read the menu choice from the user.
There are two of
these statements. One before the loop
and another at the bottom of the loop.
3
Run your program to test printing and reading the menu choice to be sure
this is working correctly.
4
.
Open the file, read the input data from the file, create a Song object for each
one, store the song object in the
array. When done, close the file.
Remember
to use a try/catch when attempting to open the file. You will also be keeping
track of how many Song objects are put into the array.
Test this using menu choice 2 to see if everything loaded correctly.
5
.
W
ri
te the code for the following
:
write the output to
SongData.txt
.
Use a try/catch for any
exceptions.
6
.
Write the code for menu choice 1.
Prompt the
user
,
r
ead the data from the keyboard and
create a new Song
object
.
Add the song to the array
o
Don't forget to add
to the count so you know how many items are in the
array
Add the song to the file
7
.
Close the output file.
8
.
Run the code. Add a song, then use menu choice 2 to see if it was added
correctly.
o
If both prompts print at the same time, you may have to
deal with the
newline character between reading choice and the title.
Explanation / Answer
Complete Program:
// File: Song.java
public class Song
{
private String title;
private String artist;
public Song(String aTitle, String aArtist)
{
title = aTitle;
artist = aArtist;
}
public String getTitle()
{
return title;
}
public void setTitle(String aTitle)
{
title = aTitle;
}
public String getArtist()
{
return artist;
}
public void setArtist(String aArtist)
{
artist = aArtist;
}
public String toString()
{
return title + " by " + artist;
}
}
// File: CDDriver.java
import java.io.*;
import java.util.*;
public class CDDriver
{
public static void main(String[] args)
{
final int MAX_ARRAY_SIZE = 50;
final String FILENAME = "Collection.txt";
Scanner keyboard = new Scanner(System.in);
int count = 0;
int choice = 0;
Song[] songs = new Song[MAX_ARRAY_SIZE];
String aTitle;
String aArtist;
try
{
Scanner infile = new Scanner(new File(FILENAME));
while(infile.hasNextLine() && count < MAX_ARRAY_SIZE)
{
aTitle = infile.nextLine();
aArtist = infile.nextLine();
Song filesong = new Song(aTitle, aArtist);
songs[count] = filesong;
count++;
}
infile.close();
PrintWriter outfile = new PrintWriter(new BufferedWriter(new FileWriter(FILENAME, true)));
System.out.println();
System.out.println("CD Collection Menu");
System.out.println("1. Add a CD");
System.out.println("2. Print List");
System.out.println("3. Quit");
System.out.print("Enter the menu choice: ");
choice = Integer.parseInt(keyboard.nextLine());
while(choice != 3)
{
switch(choice)
{
case 1:
System.out.print("Enter the title: ");
aTitle = keyboard.nextLine();
System.out.print("Enter the artist: ");
aArtist = keyboard.nextLine();
Song usersong = new Song(aTitle, aArtist);
songs[count] = usersong;
count++;
outfile.println(aTitle);
outfile.println(aArtist);
break;
case 2:
System.out.println(" Songs stored in the array:");
for(int i = 0; i < count; i++)
System.out.println(songs[i]);
break;
default:
System.out.println("Invalid menu choice. Please try again.");
}
System.out.println();
System.out.println("CD Collection Menu");
System.out.println("1. Add a CD");
System.out.println("2. Print List");
System.out.println("3. Quit");
System.out.print("Enter the menu choice: ");
choice = Integer.parseInt(keyboard.nextLine());
}
outfile.close();
}
catch(FileNotFoundException e)
{
e.printStackTrace();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
File at the beginning: (Assumed)
title 1
artist 1
title 2
artist 2
title 3
artist 3
title 4
artist 4
title 5
artist 5
title 6
artist 6
title 7
artist 3
title 8
artist 5
Sample Output on console:
CD Collection Menu
1. Add a CD
2. Print List
3. Quit
Enter the menu choice: 2
Songs stored in the array:
title 1 by artist 1
title 2 by artist 2
title 3 by artist 3
title 4 by artist 4
title 5 by artist 5
title 6 by artist 6
title 7 by artist 3
title 8 by artist 5
CD Collection Menu
1. Add a CD
2. Print List
3. Quit
Enter the menu choice: 1
Enter the title: title 9
Enter the artist: artist 2
CD Collection Menu
1. Add a CD
2. Print List
3. Quit
Enter the menu choice: 1
Enter the title: title 10
Enter the artist: artist 4
CD Collection Menu
1. Add a CD
2. Print List
3. Quit
Enter the menu choice: 2
Songs stored in the array:
title 1 by artist 1
title 2 by artist 2
title 3 by artist 3
title 4 by artist 4
title 5 by artist 5
title 6 by artist 6
title 7 by artist 3
title 8 by artist 5
title 9 by artist 2
title 10 by artist 4
CD Collection Menu
1. Add a CD
2. Print List
3. Quit
Enter the menu choice: 4
Invalid menu choice. Please try again.
CD Collection Menu
1. Add a CD
2. Print List
3. Quit
Enter the menu choice: 3
File at the end:
title 1
artist 1
title 2
artist 2
title 3
artist 3
title 4
artist 4
title 5
artist 5
title 6
artist 6
title 7
artist 3
title 8
artist 5
title 9
artist 2
title 10
artist 4
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