Here you can find the source of toDoubleAsUnsigned(long v)
public static double toDoubleAsUnsigned(long v)
//package com.java2s; /* History Gluon//w w w. j av a2 s . com Copyright (C) 2012 MIRACLE LINUX CORPORATION This program 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. This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ public class Main { public static double toDoubleAsUnsigned(long v) { if (v >= 0) return (double) v; double dbl = v; dbl += Math.pow(2, 64); return dbl; } }