我用一个 JFileChooser 打开一个 .txt 文件，并开始读取，但开始读取后，就停止响应，直到读完后才可以。附程序代码：

         JFileChooser chooser = new JFileChooser();
         chooser.setCurrentDirectory(new File("."));
         chooser.setFileFilter(
            new javax.swing.filechooser.FileFilter()
            {  public boolean accept(File f)
               {  String fname = f.getName().toLowerCase();
                  return fname.endsWith(".txt")
                     || f.isDirectory();
               }
               public String getDescription()
               { return "Text Files"; }
            });
         int r = chooser.showOpenDialog(this);
         if (r == JFileChooser.APPROVE_OPTION)
            readFile(chooser.getSelectedFile());
      }
    
         public void readFile(final File f)

            {  

               FileInputStream fileIn = new FileInputStream(f);
               ProgressMonitorInputStream progressIn
                  = new ProgressMonitorInputStream(TextFrame.this,
                     "Reading " + f.getName(), fileIn);
               InputStreamReader inReader
                  = new InputStreamReader(progressIn);
               BufferedReader in = new BufferedReader(inReader);

               
               int count = 0; //the lines of the .txt file
               String line;
               while ((line = in.readLine()) != null)
                  count++;
               fileIn.close();
           }
               
 请问怎么解决？

readFile 用线程解决:
 
   ... readFile(File f){
      try{
         Thread readThread=new Thread(){
            public void run(){
               ...
            }
          };
          readThread.start();
       }catch(IOException ioe){
          System.out.println(ioe);
       }
     }
Is it OK?

txt太大了吧???要么把readFile变成线程的.