1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.math.random; 18 19 import java.util.Random; 20 21 /** 22 * Extension of <code>java.util.Random</code> to implement 23 * {@link RandomGenerator}. 24 * 25 * @since 1.1 26 * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $ 27 */ 28 public class JDKRandomGenerator extends Random implements RandomGenerator { 29 30 /** Serializable version identifier. */ 31 private static final long serialVersionUID = -7745277476784028798L; 32 33 /** {@inheritDoc} */ 34 public void setSeed(int seed) { 35 setSeed((long) seed); 36 } 37 38 /** {@inheritDoc} */ 39 public void setSeed(int[] seed) { 40 // the following number is the largest prime that fits in 32 bits (it is 2^32 - 5) 41 final long prime = 4294967291l; 42 43 long combined = 0l; 44 for (int s : seed) { 45 combined = combined * prime + s; 46 } 47 setSeed(combined); 48 } 49 50 } 51
