Dropping RandomUtils from Lang to the backcompat
git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@754600 13f79535-47bb-0310-9956-ffa450edef68
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Henri Yandell
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.apache.commons.lang.math;
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import java.util.Random;
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/**
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* <p><code>RandomUtils</code> is a wrapper that supports all possible
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* {@link java.util.Random} methods via the {@link java.lang.Math#random()}
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* method and its system-wide <code>Random</code> object.
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*
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* @author Gary D. Gregory
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* @since 2.0
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* @version $Id$
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*/
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public class RandomUtils {
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/**
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* An instance of {@link JVMRandom}.
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*/
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public static final Random JVM_RANDOM = new JVMRandom();
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// should be possible for JVM_RANDOM?
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// public static void nextBytes(byte[]) {
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// public synchronized double nextGaussian();
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// }
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/**
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* <p>Returns the next pseudorandom, uniformly distributed int value
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* from the Math.random() sequence.</p>
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*
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* @return the random int
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*/
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public static int nextInt() {
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return nextInt(JVM_RANDOM);
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}
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/**
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* <p>Returns the next pseudorandom, uniformly distributed int value
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* from the given <code>random</code> sequence.</p>
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*
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* @param random the Random sequence generator.
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* @return the random int
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*/
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public static int nextInt(Random random) {
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return random.nextInt();
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}
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/**
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* <p>Returns a pseudorandom, uniformly distributed int value
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* between <code>0</code> (inclusive) and the specified value
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* (exclusive), from the Math.random() sequence.</p>
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*
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* @param n the specified exclusive max-value
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* @return the random int
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*/
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public static int nextInt(int n) {
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return nextInt(JVM_RANDOM, n);
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}
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/**
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* <p>Returns a pseudorandom, uniformly distributed int value
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* between <code>0</code> (inclusive) and the specified value
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* (exclusive), from the given Random sequence.</p>
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*
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* @param random the Random sequence generator.
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* @param n the specified exclusive max-value
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* @return the random int
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*/
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public static int nextInt(Random random, int n) {
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// check this cannot return 'n'
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return random.nextInt(n);
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}
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/**
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* <p>Returns the next pseudorandom, uniformly distributed long value
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* from the Math.random() sequence.</p>
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*
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* @return the random long
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*/
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public static long nextLong() {
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return nextLong(JVM_RANDOM);
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}
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/**
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* <p>Returns the next pseudorandom, uniformly distributed long value
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* from the given Random sequence.</p>
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*
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* @param random the Random sequence generator.
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* @return the random long
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*/
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public static long nextLong(Random random) {
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return random.nextLong();
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}
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/**
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* <p>Returns the next pseudorandom, uniformly distributed boolean value
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* from the Math.random() sequence.</p>
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*
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* @return the random boolean
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*/
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public static boolean nextBoolean() {
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return nextBoolean(JVM_RANDOM);
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}
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/**
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* <p>Returns the next pseudorandom, uniformly distributed boolean value
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* from the given random sequence.</p>
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*
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* @param random the Random sequence generator.
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* @return the random boolean
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*/
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public static boolean nextBoolean(Random random) {
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return random.nextBoolean();
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}
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/**
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* <p>Returns the next pseudorandom, uniformly distributed float value
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* between <code>0.0</code> and <code>1.0</code> from the Math.random()
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* sequence.</p>
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*
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* @return the random float
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*/
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public static float nextFloat() {
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return nextFloat(JVM_RANDOM);
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}
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/**
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* <p>Returns the next pseudorandom, uniformly distributed float value
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* between <code>0.0</code> and <code>1.0</code> from the given Random
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* sequence.</p>
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*
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* @param random the Random sequence generator.
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* @return the random float
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*/
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public static float nextFloat(Random random) {
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return random.nextFloat();
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}
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/**
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* <p>Returns the next pseudorandom, uniformly distributed float value
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* between <code>0.0</code> and <code>1.0</code> from the Math.random()
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* sequence.</p>
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*
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* @return the random double
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*/
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public static double nextDouble() {
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return nextDouble(JVM_RANDOM);
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}
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/**
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* <p>Returns the next pseudorandom, uniformly distributed float value
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* between <code>0.0</code> and <code>1.0</code> from the given Random
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* sequence.</p>
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*
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* @param random the Random sequence generator.
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* @return the random double
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*/
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public static double nextDouble(Random random) {
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return random.nextDouble();
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}
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}
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