// 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.

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("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 53 0A 00 05 00 22 07

00010: 00 23 0A 00 02 00 22 08 00 24 07 00 25 0A 00 26

00020: 00 27 0A 00 28 00 29 0A 00 02 00 2A 08 00 2B 0A

00030: 00 2C 00 2D 08 00 2E 0A 00 02 00 2F 09 00 30 00

00040: 31 08 00 32 0A 00 33 00 34 0A 00 15 00 35 0A 00

00050: 36 00 37 07 00 38 0A 00 12 00 39 0A 00 33 00 3A

...

*/