Here you can find the source of longToByteArray(long value, int nrOfBytes)
public static final byte[] longToByteArray(long value, int nrOfBytes)
//package com.java2s; /*/*from w ww.ja va 2 s.c om*/ Copyright 2015 Rudolf Fiala This file is part of Alpheus AFP Parser. Alpheus AFP Parser is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Alpheus AFP Parser 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 General Public License for more details. You should have received a copy of the GNU General Public License along with Alpheus AFP Parser. If not, see <http://www.gnu.org/licenses/> */ public class Main { /** * Converts the given int value to an array of byte of given length. In Java an int value has the * size of 4 bytes. */ public static final byte[] longToByteArray(long value, int nrOfBytes) { byte[] result = new byte[nrOfBytes]; for (int i = 0; i < nrOfBytes && i < 8; i++) { result[nrOfBytes - 1 - i] = (byte) (value >>> (i * 8)); } return result; } }