Here you can find the source of random(double min, double max)
public static double random(double min, double max)
//package com.java2s; /**/*from w w w.j a v a 2 s. co m*/ * JLibs: Common Utilities for Java * Copyright (C) 2009 Santhosh Kumar T <santhosh.tekuri@gmail.com> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. */ public class Main { public static double random(double min, double max) { return min + Math.random() * (max - min); } public static float random(float min, float max) { return (float) (min + Math.random() * (max - min)); } public static long random(long min, long max) { return Math.round(min + Math.random() * (max - min)); } public static int random(int min, int max) { return (int) Math.round(min + Math.random() * (max - min)); } public static short random(short min, short max) { return (short) Math.round(min + Math.random() * (max - min)); } public static byte random(byte min, byte max) { return (byte) Math.round(min + Math.random() * (max - min)); } }