Interacting with Filesystems - Beginning Java 7 - page 736

Listing 8-10. Scrambling a file's bytes

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import java.util.Random;

class Scramble
{

public static void main(String[] args)
{

if (args.length != 2)
{

System.err.println("usage: java Scramble srcpath
destpath");
return;

}
try (FileInputStream fis = new FileIn-

putStream(args[0]);
ScrambledOutputStream sos =
new ScrambledOutputStream(new FileOut-

putStream(args[1]),

makeMap()))

{

int b;
while ((b = fis.read()) != -1)
sos.write(b);

}
catch (IOException ioe)
{

ioe.printStackTrace();

}

}
static int[] makeMap()
{

int[] map = new int[256];