메모장 짤때 File 메뉴 있는 부분을 클래스로 떨어뜨려 놓은건데
오류가 나서요... ㅠㅠ 고수님들 쓱 보시고 뭐땜인지 아시리라 믿어 의심치 않습니다 ㅠ


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

//메뉴_파일
public class File extends JFrame{
 public JMenu File; 
 public JMenuItem fnew;    
 public JMenuItem fopen;   
 public JMenuItem foverride;  
 public JMenuItem fsave;   
 public JMenuItem fclose; 
 public JFileChooser fileChoose; 
 public String currentFile;   
 public String currentPath; 

 //파일 소메뉴
 public File(){
  File = new JMenu("파일");   
  File.setMnemonic(\'F\');    
  fnew = new JMenuItem("새로 만들기(N)");   
  fopen = new JMenuItem("열기(O)");   
  foverride = new JMenuItem("저장(S)");  
  fsave = new JMenuItem("다른 이름으로 저장(A)");  
  File.addSeparator();   
  fclose  = new JMenuItem("끝내기");  

  File.add(fnew);     
  File.add(fopen);     
  File.add(foverride);    
  File.add(fsave);     
  File.add(fclose);
  
  fileChoose = new JFileChooser(); 
  
  //새로 만들기 기능
  fnew.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent aevt) {
    setTitle("메모장-제목없음");   
    Memo.keyText.setText("");    
   }
  });
  
  //열기 기능
  fopen.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent aevt) {
     
    int openDiag = fileChoose.showOpenDialog(File.this);

    if (openDiag == JFileChooser.APPROVE_OPTION) {       
     try {
      String  readStr;     
      File fis = fileChoose.getSelectedFile();   
      currentPath = fis.getAbsolutePath();    
      BufferedReader bread = new BufferedReader(
        new FileReader(currentPath));
      Memo.keyText.setText(bread.readLine());

      while ((readStr = bread.readLine()) != null) {
       Memo.keyText.append("\\n" + readStr);    
      }

      bread.close();         
      currentFile = fis.getName();     
      setTitle("메모장-" + currentFile);
     }catch(IOException ie) {
      JOptionPane optionpane =
       new JOptionPane("IO에러:", JOptionPane.ERROR_MESSAGE);
      JDialog diag = optionpane.createDialog(Memo.pane,"File");
      diag.setVisible(true);
     }
    }
   }
  });
  
  //저장 기능
  foverride.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent aevt) {
    if (currentPath != null) {       
     try {     
      PrintWriter pwrite = new PrintWriter(
        new BufferedWriter(
          new FileWriter(currentPath)));
      pwrite.write(Memo.keyText.getText()); 
      pwrite.close();    
     }     
     catch(IOException ie) {
      JOptionPane optionpane =
       new JOptionPane("IO에러:", JOptionPane.ERROR_MESSAGE);
      JDialog diag = optionpane.createDialog(Memo.pane,"메모장");
      diag.setVisible(true);
     }
    } else {   
     int openDiag = fileChoose.showSaveDialog(File.this);

     if (openDiag == JFileChooser.APPROVE_OPTION) {
      try {
       File fos = fileChoose.getSelectedFile();  
       currentPath = fos.getAbsolutePath();   

       PrintWriter pwrite = new PrintWriter(new BufferedWriter(
         new FileWriter(currentPath)));

       pwrite.write(Memo.keyText.getText());  
       pwrite.close();     
       currentFile = fos.getName();      
       setTitle("메모장-" + currentFile); 
      } 

      catch(IOException ie) {
       JOptionPane optionpane =
        new JOptionPane("IO에러:", JOptionPane.ERROR_MESSAGE);
       JDialog diag = optionpane.createDialog(Memo.pane,"메모장");
       diag.setVisible(true);
      }
     }
    }
   }
  });

  //다른 이름으로 저장 기능
  fsave.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent aevt) {
    int openDiag = fileChoose.showSaveDialog(File.this);
    if (openDiag == JFileChooser.APPROVE_OPTION) {
     try {
      File fos = fileChoose.getSelectedFile();    
      currentPath = fos.getAbsolutePath();   
      PrintWriter pwrite = new PrintWriter(
        new BufferedWriter(
          new FileWriter(currentPath)));

      pwrite.write(Memo.keyText.getText());    
      pwrite.close();       
      currentFile = fos.getName();    
      setTitle("메모장-" + currentFile);
     }

     catch(IOException ie) {
      JOptionPane optionpane =
       new JOptionPane("IO에러:", JOptionPane.ERROR_MESSAGE);
      JDialog diag = optionpane.createDialog(Memo.pane,"메모장");
      diag.setVisible(true);
     }
    }
   }
  });

  //닫기 기능
  fclose.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent aevt) {
    System.exit(0);          
   }
  });
 }
}


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File fis = fileChoose.getSelectedFile();   
      currentPath = fis.getAbsolutePath(); 

File fos = fileChoose.getSelectedFile();  
       currentPath = fos.getAbsolutePath();

File fos = fileChoose.getSelectedFile();    
      currentPath = fos.getAbsolutePath(); 

요 세부분인데요 ,,, 고수님들 헬미 ㅠㅠ