copy file using FileReader/Writer.

The code below demonstates copying file using 'FileReader' and 'FileWriter'.

 1 class CopyV2 extends Timer
 2 {
 3     public void runCode() 
 4     {
 5         File fSrc = new File("f.txt");
 6         File fDes = new File("f_des.txt");
 7         Reader r = null;
 8         Writer w = null;
 9         try
10         {
11             r = new FileReader(fSrc);
12             w = new FileWriter(fDes);
13             int num = -1;    //the character read.
14             while((num = r.read()) != -1)
15                 w.write((char)num);
16         }
17         catch (FileNotFoundException e)
18         {
19             fDes.delete();
20             println(e);
21         }
22         catch(IOException e)
23         {
24             
25         }
26         finally
27         {
28             try
29             {
30                 if(r != null)
31                     r.close();
32             }
33             catch (IOException e)
34             {
35             }
36 
37             try
38             {
39                 if(w != null)
40                     w.close();
41             }
42             catch (IOException e)
43             {
44             }
45         }
46     }
47 }

 

upon the code,'Timer' is a class defined by myself,which was used to calculate the elapsed time using 'template method pattern'.

and the figure below simply drawn the relevant steps: