public class Result {
  private File result =new File("result.txt");
  private FileWriter writer;

  private PrintWriter pw;

 public Result() {
 try {
    writer = new FileWriter("result.txt");    

    pw=new PrintWriter(writer);
  }
  catch (IOException iox){
    System.err.println(iox);
   }

}

 public void  aLine(String in) { //写入一行
 pw.println(in);

}
  public void finish() {  //关闭输入流，将文字从缓存写入文件

 try{
pw.flush();
writer.close();
}catch (IOException iox){
          System.err.println(iox);
}

}

}