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/*
* 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.
*/
package org.apache.commons.math.random;
/**
* Interface extracted from <code>java.util.Random</code>. This interface is
* implemented by {@link AbstractRandomGenerator}.
*
* @since 1.1
* @version $Revision: 949750 $ $Date: 2010-05-31 16:06:04 +0200 (lun. 31 mai 2010) $
*/
public interface RandomGenerator {
/**
* Sets the seed of the underlying random number generator using an
* <code>int</code> seed.
* <p>Sequences of values generated starting with the same seeds
* should be identical.
* </p>
* @param seed the seed value
*/
void setSeed(int seed);
/**
* Sets the seed of the underlying random number generator using an
* <code>int</code> array seed.
* <p>Sequences of values generated starting with the same seeds
* should be identical.
* </p>
* @param seed the seed value
*/
void setSeed(int[] seed);
/**
* Sets the seed of the underlying random number generator using a
* <code>long</code> seed.
* <p>Sequences of values generated starting with the same seeds
* should be identical.
* </p>
* @param seed the seed value
*/
void setSeed(long seed);
/**
* Generates random bytes and places them into a user-supplied
* byte array. The number of random bytes produced is equal to
* the length of the byte array.
*
* @param bytes the non-null byte array in which to put the
* random bytes
*/
void nextBytes(byte[] bytes);
/**
* Returns the next pseudorandom, uniformly distributed <code>int</code>
* value from this random number generator's sequence.
* All 2<font size="-1"><sup>32</sup></font> possible <tt>int</tt> values
* should be produced with (approximately) equal probability.
*
* @return the next pseudorandom, uniformly distributed <code>int</code>
* value from this random number generator's sequence
*/
int nextInt();
/**
* Returns a pseudorandom, uniformly distributed <tt>int</tt> value
* between 0 (inclusive) and the specified value (exclusive), drawn from
* this random number generator's sequence.
*
* @param n the bound on the random number to be returned. Must be
* positive.
* @return a pseudorandom, uniformly distributed <tt>int</tt>
* value between 0 (inclusive) and n (exclusive).
* @throws IllegalArgumentException if n is not positive.
*/
int nextInt(int n);
/**
* Returns the next pseudorandom, uniformly distributed <code>long</code>
* value from this random number generator's sequence. All
* 2<font size="-1"><sup>64</sup></font> possible <tt>long</tt> values
* should be produced with (approximately) equal probability.
*
* @return the next pseudorandom, uniformly distributed <code>long</code>
*value from this random number generator's sequence
*/
long nextLong();
/**
* Returns the next pseudorandom, uniformly distributed
* <code>boolean</code> value from this random number generator's
* sequence.
*
* @return the next pseudorandom, uniformly distributed
* <code>boolean</code> value from this random number generator's
* sequence
*/
boolean nextBoolean();
/**
* Returns the next pseudorandom, uniformly distributed <code>float</code>
* value between <code>0.0</code> and <code>1.0</code> from this random
* number generator's sequence.
*
* @return the next pseudorandom, uniformly distributed <code>float</code>
* value between <code>0.0</code> and <code>1.0</code> from this
* random number generator's sequence
*/
float nextFloat();
/**
* Returns the next pseudorandom, uniformly distributed
* <code>double</code> value between <code>0.0</code> and
* <code>1.0</code> from this random number generator's sequence.
*
* @return the next pseudorandom, uniformly distributed
* <code>double</code> value between <code>0.0</code> and
* <code>1.0</code> from this random number generator's sequence
*/
double nextDouble();
/**
* Returns the next pseudorandom, Gaussian ("normally") distributed
* <code>double</code> value with mean <code>0.0</code> and standard
* deviation <code>1.0</code> from this random number generator's sequence.
*
* @return the next pseudorandom, Gaussian ("normally") distributed
* <code>double</code> value with mean <code>0.0</code> and
* standard deviation <code>1.0</code> from this random number
* generator's sequence
*/
double nextGaussian();
}
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