Here you can find the source of multiply(final long x, final long y)
public static long multiply(final long x, final long y)
//package com.java2s; /*/*ww w. j a va 2 s . co m*/ * This program is free software; you can redistribute it and/or modify it under the * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software * Foundation. * * You should have received a copy of the GNU Lesser General Public License along with this * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html * or from the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * 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 Lesser General Public License for more details. * * Copyright (c) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved. */ public class Main { /** * This is the correction factor used to convert points into 'Micro-Points'. */ private static final double CORRECTION_FACTOR = 100000.0; public static long multiply(final long x, final long y) { if (x < y) { return (long) (x * (y / CORRECTION_FACTOR)); } return (long) (y * (x / CORRECTION_FACTOR)); } }