Here you can find the source of getRandomBetween(int min, int max)
public static int getRandomBetween(int min, int max)
//package com.java2s; /**/*from w w w . j a v a 2s . co m*/ * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF 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 com.google.common.base.Preconditions; import java.util.concurrent.ThreadLocalRandom; public class Main { public static int getRandomBetween(int min, int max) { Preconditions.checkArgument(max > min); return ThreadLocalRandom.current().nextInt(max - min) + min; } }