Thread: Somethink with ArrayList

Hello guys. I started learning Java with book for beginners ("Head First Java"). And now I have a problem with code from one task. My compilation program show me that problem with ArrayList (later QuizCard and cardList everywhere). I don't know how fix it. Help me. Thanks.

 
 
import javax.swing.*;
import java.util.*;
import java.awt.*;
import java.io.*;
import java.awt.event.*;
 
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 {
		  BufferedWriter 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("couldn't write the cardList out");
		  ex.printStackTrace();
	  }
  }
 
 
 
}

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