Here you can find the source of nextLong(long RangeBottom, long rangeTop)
public static long nextLong(long RangeBottom, long rangeTop)
//package com.java2s; /*// w w w.j a v a 2 s .c om * Copyright (c) 2014, 2016 Cisco Systems, Inc. and others. All rights reserved. * * This program and the accompanying materials are made available under the * terms of the Eclipse Public License v1.0 which accompanies this distribution, * and is available at http://www.eclipse.org/legal/epl-v10.html */ import java.util.Random; public class Main { private static Random rnd = new Random(); public static long nextLong(long RangeBottom, long rangeTop) { return RangeBottom + ((long) (rnd.nextDouble() * (rangeTop - RangeBottom))); } }