Here you can find the source of fromLong(long x)
public static byte[] fromLong(long x)
//package com.java2s; /*// ww w .ja v a 2 s. c o m * Copyright (c) www.bugull.com * * 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 { public static byte[] fromLong(long x) { byte[] result = new byte[8]; result[0] = (byte) ((x >> 56) & 0xFF); result[1] = (byte) ((x >> 48) & 0xFF); result[2] = (byte) ((x >> 40) & 0xFF); result[3] = (byte) ((x >> 32) & 0xFF); result[4] = (byte) ((x >> 24) & 0xFF); result[5] = (byte) ((x >> 16) & 0xFF); result[6] = (byte) ((x >> 8) & 0xFF); result[7] = (byte) (x & 0xFF); return result; } }