Dada_WenJian

 1 import java.io.BufferedReader;
 2 import java.io.File;
 3 import java.io.FileReader;
 4 import java.io.FileWriter;
 5 import java.io.PrintWriter;
 6 import java.util.Scanner;
 7 
 8 public class F1_F2_copy {
 9 
10     public void F1_F2(File f1,File f2)
11     {
12         try
13         {
14         
15             int i=1;
16             //写入f2
17             FileWriter fw=new FileWriter(f2,false);
18             PrintWriter pw=new PrintWriter(fw);
19             //阅读f1
20             Scanner shuru = new Scanner(new BufferedReader(new FileReader(f1)));
21         while(shuru.hasNext())
22         {
23             pw.println(i+"  "+shuru.next());//插入行号
24             i++;
25         }
26             
27             pw.flush();
28             pw.close();
29             fw.close();
30             
31             
32         }
33         catch(Exception e)
34         {
35             System.out.println("错误");
36         }
37 
38     }
39 }

对一个空文本复制一个有行号的文本