Here you can find the source of randLong()
public static final long randLong()
//package com.java2s; /**//from w w w. ja va 2 s .c o m * MockUtil.java * * Copyright 2011 Niolex, Inc. * * Niolex licenses this file to you 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. */ import java.util.Random; public class Main { private static Random generator = new Random(); /** * Returns the next pseudo random, uniformly distributed long value. Because of the restriction of * JDK Random utility, not all long value are possible to be returned. * * @return the result */ public static final long randLong() { return generator.nextLong(); } }