Here you can find the source of toHex(byte in[])
public static String toHex(byte in[])
//package com.java2s; //License from project: Open Source License public class Main { public static String toHex(byte in[]) { byte ch = 0x00; int i = 0; if (in == null || in.length <= 0) return null; String pseudo[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F" }; StringBuffer out = new StringBuffer(in.length * 3); while (i < in.length) { ch = (byte) (in[i] & 0xF0); // Strip off high nibble ch = (byte) (ch >>> 4); // shift the bits down ch = (byte) (ch & 0x0F); // must do this is high order bit is on! out.append(pseudo[ch]); // convert the nibble to a String // Character ch = (byte) (in[i] & 0x0F); // Strip off low nibble out.append(pseudo[ch]); // convert the nibble to a String // Character out.append(" "); i++;/*from w w w.j a va 2 s . c o m*/ } String rslt = new String(out); return rslt; } }