【例7-6】源程序Bwriter.java，从键盘键入一系列字符串，写入到某磁盘文件中。

import java.io.*;

public class Bwriter

{

    public static void main(String args[])   throws Exception

    {

     InputStreamReader i=new InpytStreamReader(System.in);

     BufferedReader b=new BufferedReader(i);

     FileWriter w=new FileWriter("file1.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;                           //如果用户直接回车，代表结束

             w.write(s);

             w.newLine();

        }

     w.close( );

     }

}