// onjava/Hex.java

// (c)2016 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://mindviewinc.com/Books/OnJava/ for more book information.

// {java onjava.Hex}

package onjava;

import java.io.*;

import java.nio.file.*;

public class Hex {

public static String format(byte[] data) {

StringBuilder result = new StringBuilder();

int n = 0;

for(byte b : data) {

if(n % 16 == 0)

result.append(String.format("%05X: ", n));

result.append(String.format("%02X ", b));

n++;

if(n % 16 == 0) result.append("\n");

}

result.append("\n");

return result.toString();

}

public static void

main(String[] args) throws Exception {

if(args.length == 0)

// Test by displaying this class file:

System.out.println(format(

Files.readAllBytes(Paths.get(

"build/classes/main/onjava/Hex.class"))));

else

System.out.println(format(

Files.readAllBytes(Paths.get(args[0]))));

}

}

/* Output: (First 6 Lines)

00000: CA FE BA BE 00 00 00 34 00 61 0A 00 05 00 31 07

00010: 00 32 0A 00 02 00 31 08 00 33 07 00 34 0A 00 35

00020: 00 36 0A 00 0F 00 37 0A 00 02 00 38 08 00 39 0A

00030: 00 3A 00 3B 08 00 3C 0A 00 02 00 3D 09 00 3E 00

00040: 3F 08 00 40 07 00 41 0A 00 42 00 43 0A 00 44 00

00050: 45 0A 00 14 00 46 0A 00 47 00 48 07 00 49 01 00

...

*/