源程序Bwriter.java,从键盘输入一系列字符串，写入到某磁盘文件中

import java.io.*;
public class  Bwiter{
public static void main(String args[]) throws Exception{
InputStreamReader i =new InputStreamReader(System.in);
BufferedReader b = new BufferedReader(i);
FileWriter f = new FileWriter("file1.txt");
BuferedWriter w =new BufferedReader(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();
}
}