Here you can find the source of longToEightBytes(final long value)
private static byte[] longToEightBytes(final long value)
//package com.java2s; /*//from ww w.j a v a2s .c om * JBoss, Home of Professional Open Source. * Copyright 2015 Red Hat, Inc., and individual contributors * as indicated by the @author tags. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { private static byte[] longToEightBytes(final long value) { byte[] b = new byte[8]; int shift = 56; for (int i = 0; i < 8; i++) { b[i] = (byte) ((value >>> shift) & 0xff); shift -= 8; } return b; } }