Java tutorial
//package com.java2s; /** * JLibs: Common Utilities for Java * Copyright (C) 2009 Santhosh Kumar T <santhosh.tekuri@gmail.com> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. */ import java.util.*; public class Main { public static byte[] toByteArray(Collection<? extends Number> c) { byte arr[] = new byte[c.size()]; int i = 0; for (Number item : c) arr[i++] = item.byteValue(); return arr; } }