Dúvida no exercício de: Arquivo + Collections + token?

package colecoes;
import java.util.*;
import java.io.*;

public class DVDInfo {
	String title;
	String genre;
	String leadActor;
	ArrayList<String> al = new ArrayList<String>();
	
	/*DVDInfo(String t, String g, String l) {
		title = t;
		genre = g;
		leadActor = l;
	}*/
	//Populando a Lista
	public void populateList() {
		try {
			File file = new File("dvdinfo.txt");
			FileWriter fw = new FileWriter(file);
			BufferedWriter bw = new BufferedWriter(fw);
			file.createNewFile();
			bw.write("Donnie Darko/sci-fi/Gyllenhall, Jake");
			bw.write("Raiders of the Lost Ark/action/Ford, Harrison");
			bw.write("2001/sci-fi/??");
			bw.write("Caddy Shack/comedy/Murray, Bill");
			bw.write("Star Wars/sci-fi/Ford, Harrison");
			bw.write("Lost in Translation/comedy/Murray, Bill");
			bw.write("Patriot  Games/action/Ford, Harrison");
			bw.flush();
			bw.close();
			
		} catch(Exception exception) {
			exception.printStackTrace();
		}
		
		try {
			File fileR = new File("dvdinfo.txt");
			BufferedReader  br = new BufferedReader(
									new FileReader(fileR));
			
			String token;
			String[] tokens;
			
			while((token = br.readLine()) != null) {
				tokens = token.split(" ");  // Lê a linha inteira e joga dentro de al
				for(String palavra : tokens) {
					al.add(palavra);
				}
			}
			br.close();
			
		} catch(Exception exception) {
			exception.printStackTrace();
		}
	}
	
	public void setTitle(String t) {
		title = t;
	}
	
	public String getTitle() {
		return title;
	}
	
	public void setGenre(String g) {
		genre = g;
	}
	public String getGenre() {
		return genre;
	}
	
	public void setLeadActor(String la) {
		leadActor = la;
	}
	
	public String getLeadActor() {
		return leadActor;
	}
	
	public String toString(){
		return title + " " + genre + " " + leadActor;
	}
}

package colecoes;
import java.util.*;

public class TesteDVDInfo {
	public static void main(String[] args) {
		DVDInfo dvdLista = new DVDInfo();
		dvdLista.populateList();
		dvdLista.populateList();
		System.out.println(dvdLista.al);
	}	
}