Here you can find the source of toHexString(byte[] bytes)
private static String toHexString(byte[] bytes)
//package com.java2s; //License from project: Apache License public class Main { private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; private static String toHexString(byte[] bytes) { int l = bytes.length; char[] out = new char[l << 1]; for (int i = 0, j = 0; i < l; i++) { out[j++] = DIGITS[(0xF0 & bytes[i]) >>> 4]; out[j++] = DIGITS[0x0F & bytes[i]]; }//w ww . ja va 2s . c o m return new String(out); } }