Here you can find the source of randomInt(int low, int high)
static int randomInt(int low, int high)
//package com.java2s; /*//from w w w . j a v a 2 s .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 java.util.*; public class Main { private static final Random RANDOM = new Random(); static int randomInt(int low, int high) { int range = high - low + 1; return (int) (range * RANDOM.nextDouble()) + low; } }