Here you can find the source of bytes2Long(final byte[] b)
public static long bytes2Long(final byte[] b)
//package com.java2s; /*//w ww .java 2 s . c o m * ByteUtil.java - utilities for byte array handling. * * Copyright (c) 2009-2015 PIAX develoment team * Copyright (c) 2006-2008 Osaka University * Copyright (c) 2004-2005 BBR Inc, Osaka University * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * $Id: ByteUtil.java 1176 2015-05-23 05:56:40Z teranisi $ */ public class Main { public static long bytes2Long(final byte[] b) { return bytes2Long(b, 0); } public static long bytes2Long(final byte[] b, int off) { long l1 = bytes2Int(b, off); long l0 = bytes2Int(b, off + 4) & 0xffffffffL; return (l1 << 32) | l0; } public static int bytes2Int(final byte[] b) { return bytes2Int(b, 0); } public static int bytes2Int(final byte[] b, int off) { return ((b[off] & 0xff) << 24) | ((b[off + 1] & 0xff) << 16) | ((b[off + 2] & 0xff) << 8) | (b[off + 3] & 0xff); } }