HeadFirst >>Chapter14:ArrayList Error

[divya sharma]

Hi ,

I am copying the program from Chapter 14 from HeadFirstJava;QuizCardBuilder.java. But there is an error when I am writting program on ArryaList.

Here is a program :

package chap14;
 
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import java.io.*;
 
public class QuizCardBuilder {
 
/**
 * @param args
 */
private JTextArea question;
private JTextArea answer;
private ArrayList<QuizCard> cardList;
private JFrame frame;

public static void main(String[] args) {
// TODO Auto-generated method stub
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);
qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
qScroller.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(aScroller);
mainPanel.add(aLabel);
mainPanel.add(nextButton);

nextButton.addActionListener(new NextCardListener());
JMenu fileMenu = new JMenu();
JMenuBar menuBar = new JMenuBar();
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();

}
}
}

Following lines where I found Error:
1) private ArrayList<QuizCard> cardList;
2) cardList = new ArrayList<QuizCard>;
3) QuizCard card = new QuizCard(question.getText(),answer.getText());
cardList.add(card);

Please help me to find out error. where I went wrong.

[edit - added code tags]
[ August 02, 2007: Message edited by: Fred Rosenberger ]

[fred rosenberger]

I added code tags to your post to make it easier to read. Please use them yourself in the future when you post source code.

Now, what exactly is the error you are getting, and what version of Java are you using? I'm guessing it may be because you have 1.4, and this code uses features introduced in 1.5, but without those error messages, it's just a stab in the dark.

[divya sharma]

Well I am using 5.0 version. I am using eclipse to complie the code .. I am unable to compile the code

Thanks
Divya

[David McCombs]

Posting the error message might be helpful.

[subodh gupta]

Hi,

  
[B]cardList = new ArrayList<QuizCard>;[/B]}}}
  

error is mentioned above do it like this:

  
[B]cardList = new ArrayList<QuizCard>();[/B]

if problem still persists please give me QuizCard class.
[ August 03, 2007: Message edited by: subodh gupta ]