快来救我！现场结贴！比较急，明天面试！从控制台输入写入文件！

Question

import java.io.*;
class BRRead{
  public static void main(String arg[])
    throws IOException
   {
          String str;
     BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
     System.out.println("Enter string lines,'stop' to quit.");
    //read characters
   FileOutputStream fos=new FileOutputStream("22.txt");
   DataOutputStream out=new DataOutputStream(fos);
     do{
        str=br.readLine();
      out.writeBytes(str);
      out.writeBytes("\r\n");
      //c=(char)br.read();
      //System.out.println(c) ;
       }while(str.equals("stop")==false);
     fos.close();
     out.close();
   }
 }