Bwriter.java

import java.io.*;
public class Bwriter 
{
   public static void main (String args[]) throws Exception
   {
   InputStreamReader i =new InputStreamReader(System.in);
   BufferedReader b =new BufferedReader(i);
   FileWriter f = new FileWriter("file.txt");
   BufferedWriter w = new BufferedWriter(f);
     String s;
     while(true)
     {
  System.out.print("input a string:");
  System.out.flush();
  s =b.readLine();
  if(s.length()==0)
  break;
  w.write(s);
  w.newLine();
     }
   w.close();
  }

}