hvad sker der her????

package DiveLog;
import java.awt.*;
import javax.swing.*;
/**
*
* @author 
* @version
*/
public class CenterPanel extends JPanel implements ActionListener{
    private JTextArea comments;
private JScrollPane scrollpane;
private JButton saveAs;
private JLabel whiteshark;
private Box box;


    /** Creates new CenterPanel */
    public CenterPanel() {
        setBackground(Color.white);
    comments = new JTextArea("Enter comments, such as " +
    "location, water conditions, sea life you observed," +
      " and problems you may have encountered.", 15, 10);
    comments.setLineWrap(true);
    comments.setWrapStyleWord(true);
    comments.setEditable(true);
    comments.setFont(new Font(
                    "Times-Roman", Font.PLAIN, 14)); 
scrollpane = new JScrollPane(comments);
scrollpane.setVerticalScrollBarPolicy(
  JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

saveAs = new JButton("Save Comments");
saveAs.addActionListener( this );
whiteshark = new JLabel("",
    new ImageIcon("images/gwhite.gif"),
                        JLabel.CENTER);
box = Box.createVerticalBox();
box.add(scrollpane);
box.add(Box.createVerticalStrut(10));
box.add(saveAs);
box.add(Box.createVerticalStrut(15));
box.add(whiteshark);
add(box);




    }
   
    public void actionPerformed( ActionEvent evt )
{ // open method
   
  JFileChooser jfc = new JFileChooser();
  jfc.setSize(400, 300);
  Container parent = saveAs.getParent();
  int choice = jfc.showSaveDialog(parent);
     
  if (choice == JFileChooser.APPROVE_OPTION)
    {
         
    String filename =
        jfc.getSelectedFile().getAbsolutePath();
try
  { // opens try
    BufferedWriter bw =
      new BufferedWriter(new FileWriter(filename));
    bw.write(comments.getText());
    bw.flush();
    bw.close();
    } // closes try
  catch (IOException ioe)
  { // open catch
  }// close catch
  }//close if statement
} //close actionPerformed method



}
fejlrapport:


CenterPanel.java [15:1] cannot resolve symbol
symbol  : class ActionListener 
location: class DiveLog.CenterPanel
public class CenterPanel extends JPanel implements ActionListener{
                                                  ^
CenterPanel.java [56:1] cannot resolve symbol
symbol  : class ActionEvent 
location: class DiveLog.CenterPanel
    public void actionPerformed( ActionEvent evt )
                                ^
CenterPanel.java [39:1] addActionListener(java.awt.event.ActionListener) in javax.swing.AbstractButton cannot be applied to (DiveLog.CenterPanel)
saveAs.addActionListener( this );
      ^
CenterPanel.java [71:1] cannot resolve symbol
symbol  : class BufferedWriter 
location: class DiveLog.CenterPanel
    BufferedWriter bw =
    ^
CenterPanel.java [72:1] cannot resolve symbol
symbol  : class BufferedWriter 
location: class DiveLog.CenterPanel
      new BufferedWriter(new FileWriter(filename));
          ^
CenterPanel.java [72:1] cannot resolve symbol
symbol  : class FileWriter 
location: class DiveLog.CenterPanel
      new BufferedWriter(new FileWriter(filename));
                            ^
CenterPanel.java [77:1] cannot resolve symbol
symbol  : class IOException 
location: class DiveLog.CenterPanel
  catch (IOException ioe)
        ^
7 errors
Errors compiling CenterPanel.

det en del af en applikation