Java tutorial
//package com.java2s; public class Main { public static byte[] bytes2Bytes(byte[] b1, byte[] b2) { byte[] ret = new byte[b1.length + b2.length]; System.arraycopy(b1, 0, ret, 0, b1.length); System.arraycopy(b2, 0, ret, b1.length, b2.length); return ret; } }