Here you can find the source of doubleToInt64Bits(double d)
public static long doubleToInt64Bits(double d)
//package com.java2s; /*//from ww w . j a v a 2 s.co m Copyright 1995-2013 Esri 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. For additional information, contact: Environmental Systems Research Institute, Inc. Attn: Contracts Dept 380 New York Street Redlands, California, USA 92373 email: contracts@esri.com */ public class Main { public static long doubleToInt64Bits(double d) { return Double.doubleToLongBits(d); } }