copy file using FileReader/Writer.

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

 class CopyV2 extends Timer
 {
     public void runCode()
     {
         File fSrc = new File("f.txt");
         File fDes = new File("f_des.txt");
         Reader r = null;
         Writer w = null;
         try
         {
             r = new FileReader(fSrc);
             w = new FileWriter(fDes);
             int num = -1;    //the character read.
             while((num = r.read()) != -1)
                 w.write((char)num);
         }
         catch (FileNotFoundException e)
         {
             fDes.delete();
             println(e);
         }
         catch(IOException e)
         {

         }
         finally
         {
             try
             {
                 if(r != null)
                     r.close();
             }
             catch (IOException e)
             {
             }

             try
             {
                 if(w != null)
                     w.close();
             }
             catch (IOException e)
             {
             }
         }
     }
 }

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: