Oliver Wong posted:

=    You might lose performance. Imagine the OS is an elderly
librarian. You
=ask for a given book. She slowly wanders off, and 10 minutes later,
she
=comes back with your book. You then ask for a second book. She wanders
off,
=and another 10 minutes later, she comes back. That took 20 minutes.
=Alternatively, you could have asked her for 2 books right away, and it
might
=have only taken her 15 minutes to get the two books together for you.
It's
=like that. Sort of. Maybe.

    Okay, I decided to use <BufferedOutputStream> and
<BufferedInputStream> and wrote the program included below.  I noticed
that <BufferedInputStream> appears to have no way of recognizing the
end of a file.  Am I missing something, or do you have to know the
size of such a file before you can know how much of it you can use?

                               ---Kevin Simonson

"You'll never get to heaven, or even to LA,
if you don't believe there's a way."
from _Why Not_

####################################################################

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class Copy
{
 public static void main ( String[] arguments)
 {
    BufferedInputStream inStream;
   BufferedOutputStream outStream;
                    int size, count;

   if (arguments.length == 3)
   { try
     { size = Integer.parseInt( arguments[ 0]);
       inStream
         = new BufferedInputStream( new FileInputStream( arguments[
1]));
       outStream
         = new BufferedOutputStream( new FileOutputStream( arguments[
2]));
       for (count = 0; count < size; count++)
       { outStream.write( inStream.read());
       }
       inStream.close();
       outStream.close();
     }
     catch (FileNotFoundException excptn)
     { System.err.println( "File \"" + arguments[ 1] + "\" doesn't
exist.");
     }
     catch (IOException excptn)
     { System.err.println( "Some I/O error occurred.");
     }
   }
   else
   { System.out.println
       ( "Usage is\n  java Copy <source-size> <source>
<destination>");
   }
 }
}