Here you can find the source of toHexString(byte[] bytes)
public static String toHexString(byte[] bytes)
//package com.java2s; public class Main { public static String toHexString(byte[] bytes) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < bytes.length; i++) { sb.append(toHexString(bytes[i])); }/* ww w. jav a 2 s . c o m*/ return sb.toString(); } public static String toHexString(byte oneByte) { return String.format("%02x", oneByte); } }