Java tutorial
//package com.java2s; /* * Copyright 2016 Francisco Franco & Liam Spradlin * * Licensed 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 final long LOWER_RANGE = 0; private static final long UPPER_RANGE = Long.MAX_VALUE; private static Random random = new Random(); public static long getNewLong() { if (random == null) { random = new Random(); } return LOWER_RANGE + (long) (random.nextDouble() * (UPPER_RANGE - LOWER_RANGE)); } }