[Duvida] QuizCard

import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import java.io.*;

public class QuizCardBuilder{
private JTextArea question;
private JTextArea answer;
private ArrayList<QuizCard> cardList;
private JFrame frame;

public static void main(String[] args){
QuizCardBuilder builder = new QuizCardBuilder();
builder.go();
}

public void go(){
frame = new JFrame("Quiz Card Builder");
JPanel mainPanel = new JPanel();
Font bigFont = new Font("sanserif", Font.BOLD, 24);
question = new JTextArea(6,20);
question.setLineWrap(true);
question.setWrapStyleWord(true);
question.setFont(bigFont);
JScrollPane qScroller = new JScrollPane(question);
qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

answer = new JTextArea(6,20);
answer.setLineWrap(true);
answer.setWrapStyleWord(true);
answer.setFont(bigFont);

JScrollPane aScroller = new JScrollPane(answer);
aScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
aScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

JButton nextButton = new JButton("Next card");
cardList = new ArrayList<QuizCard>();

JLabel qLabel = new JLabel("Question:");
JLabel aLabel = new JLabel("Answer");

mainPanel.add(qLabel);
mainPanel.add(qScroller);
mainPanel.add(aLabel);
mainPanel.add(aScroller);
mainPanel.add(nextButton);
nextButton.addActionListener(new NextCardListener());
JMenuBar menuBar = new JMenuBar();
JMenu fileMenu = new JMenu("File");
JMenuItem newMenuItem = new JMenuItem("New");
JMenuItem saveMenuItem = new JMenuItem("Save");
newMenuItem.addActionListener(new NewMenuListener());
saveMenuItem.addActionListener(new SaveMenuListener());
fileMenu.add(newMenuItem);
fileMenu.add(saveMenuItem);
menuBar.add(fileMenu);
frame.setJMenuBar(menuBar);
frame.getContentPane().add(BorderLayout.CENTER, mainPanel);
frame.setSize(500, 600);
frame.setVisible(true);
}
public class NextCardListener implements ActionListener{
 public void actionPerformed(ActionEvent ev){
 QuizCard card = new QuizCard(question.getText(), answer.getText());
 cardList.add(card);
 clearCard();
  
 }
}

public class SaveMenuListener implements ActionListener{
 public void actionPerformed(ActionEvent ev){
 QuizCard card = new QuizCard(question.getText(), answer.getText());
 cardList.add(card);
 
 JFileChooser fileSave = new JFileChooser();
 fileSave.showSaveDialog(frame);
 saveFile(fileSave.getSelectedFile());
 }
}

public class NewMenuListener implements ActionListener{
public void actionPerformed(ActionEvent ev){
cardList.clear();
clearCard();
}
}
private void clearCard(){
question.setText("");
answer.setText("");
question.requestFocus();
}

private void saveFile(File file){
try{
 BufferedWrite writer = new BufferedWriter(new FileWriter(file));
 for(QuizCard card: cardList){
 writer.write(card.getQuestion()+"/");
 writer.write(card.getAnswer()+"\n");
 
 }
 writer.close();
}catch(IOException ex){
System.out.println("nao foi possivel escrever cardlist");
ex.printStackTrack();
}

}
}