Ok, i whipped up a version using JDK 1.4 and the java.nio package. It's faster than either of the other versions on my system.

[danboo@danboo 04:37pm ~/java]$ java X ten_meg_file__2.txt out__2
Time = 492
Buf Time = 432
[danboo@danboo 04:37pm ~/java]$ perl X.pl ten_meg_file__2.txt out__2
0.192673087120056 Seconds Elapsed.
[danboo@danboo 04:37pm ~/java]$ java X2 ten_meg_file__2.txt out__2
Time = 128
[download]

Source for X2.java:

import java.io.*;
import java.nio.*;
import java.nio.channels.*;
 
public class X2 {
 
  public static void main (String [] args) {
 
    try {
 
      long l = System.currentTimeMillis();
      FileInputStream input   = new FileInputStream(args[0]);
      FileOutputStream output = new FileOutputStream(args[1]);
 
      FileChannel inputChannel  = input.getChannel();
      FileChannel outputChannel = output.getChannel();
 
      int inputLength = (int) inputChannel.size();
      MappedByteBuffer buffer = inputChannel.map(FileChannel.MapMode.R
+EAD_ONLY, 0, inputLength);
      outputChannel.write(buffer);
      System.out.println("Time = "+ (System.currentTimeMillis()-l));
 
    }
   catch (Exception e) {
     e.printStackTrace();
   }
 
  }
 
}
[download]

Note: This is my first time using the new 'java.nio' package for memory mapped file operations. There may be better ways to do it. I don't necessarily believe these tests are accurate.

Cheers

- danboo