Here you can find the source of currentTimeMillis()
synchronized public static int currentTimeMillis()
//package com.java2s; /**//from ww w . j a va 2 s . c o m * This file is part of JEMMA - http://jemma.energy-home.org * (C) Copyright 2013 Telecom Italia (http://www.telecomitalia.it) * * JEMMA is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License (LGPL) version 3 * or later as published by the Free Software Foundation, which accompanies * this distribution and is available at http://www.gnu.org/licenses/lgpl.html * * JEMMA 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 (LGPL) for more details. * */ public class Main { /** * Gets a reference to current time as int. * * @return a reference to current time as int. */ synchronized public static int currentTimeMillis() { return (int) (System.currentTimeMillis() % Integer.MAX_VALUE); } }