Here you can find the source of bytesToHex(byte[] bytes)
public static String bytesToHex(byte[] bytes)
//package com.java2s; public class Main { final protected static char[] hexArray = "0123456789ABCDEF" .toCharArray();// www . j ava 2 s . c o m public static String bytesToHex(byte[] bytes) { char[] hexChars = new char[bytes.length * 2]; for (int j = 0; j < bytes.length; j++) { int v = bytes[j] & 0xFF; hexChars[j * 2] = hexArray[v >>> 4]; hexChars[j * 2 + 1] = hexArray[v & 0x0F]; } return new String(hexChars); } }