— Scott McNealy, Sun Microsystems Chairman, President and ceo

sorting 
a list
Challenge #1
Sort the songs in alphabetical order
SongList.txt
Pink Moon/Nick Drake
Somersault/Zero 7
Shiva Moon/Prem Joshua
Circles/BT
Deep Channel/Afro Celts
Passenger/Headmix
Listen/Tahiti 80
This is the file the jukebox device 
writes. Your code must read the file, 
then manipulate the song data.

---

collections 
with 
generics
you are here
4
531
Here’s what you have so far, without the sort:
import java.util.*;
import java.io.*;
public class Jukebox1 {
ArrayList songList = new ArrayList();
public static void main(String[] args) {
new Jukebox1().go();
}
public void 
go()
{ 
getSongs(); 
System.out.println(songList); 
}
void 
getSongs()
{
try {
File file = new File(“SongList.txt”);
BufferedReader reader = new BufferedReader(new FileReader(file));
String line = null;
while ((line= reader.readLine()) != null) {
addSong(line);
}
} catch(Exception ex) {
ex.printStackTrace();
}
}
void 
addSong(String lineToParse)
{
String[] tokens = lineToParse.split(“/”);
songList.add(tokens[0]);
}
}
We’ll store the song titles in 
an ArrayList of Strings.
Nothing special here... just read the file and 
call the addSong() method for each line.
The addSong method works just like the Quiz-
Card in the I/O chapter--you break the line 
(that has both the title and artist) into two 
pieces (tokens) using the split() method.
We only want the song title, so 
add only the first token to the 
SongList (the ArrayList).
The method that starts loading the 
file and then prints the contents of 
the songList ArrayList.
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