疑問 - JAVA I/O問題

[leowang]

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閱讀本主題的最佳解答
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我有個程式碼

     public static void main(String args[]) throws IOException
   {
      BufferedReader buf;
      String str;
    
      buf=new BufferedReader(new InputStreamReader(System.in));
      System.out.print("Input a string:\n");
          
       	str=buf.readLine();
        
         FileWriter fw=new FileWriter("a1.txt"); 
         BufferedWriter bfw=new BufferedWriter(fw);
         bfw.write(str); 
         bfw.newLine();      
         
         bfw.flush();      
         fw.close();
      }

如何用while迴圈讓它一直的輸入 直到輸入"exit"
離開存檔a1.txt