书上的程序，我确编译不了，help？

Question

import java.io.*;
public class CopyFile
{
  public static void main(String args[]) throws Exception
        {BufferedReader br=new BufferedReader(new FileReader("shi.txt"));
        BufferedWriter bw=new BufferedWriter(new FileWriter("person.txt"));
        String s,space="  ";
        int num=0;
        while(br.ready())
            {s=br.readLine();
              num++;
              bw.write(String.valueOf(num));//bw.writer(String.valueOf(num))
              bw.write(space);
              bw.write(s);
              bw.newLine();//bw.newLine
            }
        bw.close();
        }
}
看注释的地方!(是写错的地方)

Answer 1

已经好了。谢谢！怎么给分？
还有，为什么没改以前老说BufferedWriter bw=new BufferedWriter(new FileWriter("person.txt"));这一句出错！