Here you can find the source of longToBytes(long l, byte[] b)
public static void longToBytes(long l, byte[] b)
//package com.java2s; /*/*from w ww . j a v a2s. c o m*/ * Werkzeug * * Copyright (C) 2012 Patrick Kochlik + Dennis Paul * * 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. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * {@link http://www.gnu.org/licenses/lgpl.html} * */ public class Main { public static void longToBytes(long l, byte[] b) { if (b.length < 8) { throw new IllegalArgumentException("Byte array should contain at least 8bytes "); } for (int i = 7; i >= 0; i--) { b[i] = (byte) (l >>> (8 * i)); } } }