Here you can find the source of nano()
public static long nano()
//package com.java2s; /*//from w w w. j av a 2s.c o m * Copyright (C) 2013-2014 Byron 3D Games Studio (www.b3dgs.com) Pierre-Alexandre (contact@b3dgs.com) * * 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 2 * 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, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ public class Main { /** * Get the current time in nano second. * * @return The current time in nano second. */ public static long nano() { return System.nanoTime(); } }