Here you can find the source of getRandomDouble()
public static double getRandomDouble()
//package com.java2s; /*/*from w w w . j a v a 2 s .c o m*/ * Copyright 2004 Senunkan Shinryuu * * 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.*; public class Main { /** * Generates next random double * @return the generated double */ public static double getRandomDouble() { return getRandomDouble(0, 0); } /** * Generates next random double * @param start * @return the generated double */ public static double getRandomDouble(double start, double end) { Random rand = new Random(System.currentTimeMillis()); double d = rand.nextDouble(); if (end > start) { d = d * (end - start) + start; } return d; } }