Here you can find the source of toHexString(byte[] b)
private static String toHexString(byte[] b)
//package com.java2s; public class Main { private static String toHexString(byte[] b) { //String to byte char HEX_DIGITS[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; StringBuilder sb = new StringBuilder(b.length * 2); for (int i = 0; i < b.length; i++) { sb.append(HEX_DIGITS[(b[i] & 0xf0) >>> 4]); sb.append(HEX_DIGITS[b[i] & 0x0f]); }// w w w . ja va 2 s .co m return sb.toString(); } }