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Java example source code file (RandomGenerator.java)

This example Java source code file (RandomGenerator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

randomgenerator

The RandomGenerator.java Java example source code

/*
 * 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.math3.random;


/**
 * Interface extracted from <code>java.util.Random.  This interface is
 * implemented by {@link AbstractRandomGenerator}.
 *
 * @since 1.1
 */
public interface RandomGenerator {

    /**
     * Sets the seed of the underlying random number generator using an
     * <code>int 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 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 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
     * value from this random number generator's sequence.
     * All 2<font size="-1">32 possible {@code int} values
     * should be produced with  (approximately) equal probability.
     *
     * @return the next pseudorandom, uniformly distributed <code>int
     *  value from this random number generator's sequence
     */
    int nextInt();

    /**
     * Returns a pseudorandom, uniformly distributed {@code int} 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 {@code int}
     * 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
     * value from this random number generator's sequence.  All
     * 2<font size="-1">64 possible {@code long} values
     * should be produced with (approximately) equal probability.
     *
     * @return  the next pseudorandom, uniformly distributed <code>long
     *value from this random number generator's sequence
     */
    long nextLong();

    /**
     * Returns the next pseudorandom, uniformly distributed
     * <code>boolean value from this random number generator's
     * sequence.
     *
     * @return  the next pseudorandom, uniformly distributed
     * <code>boolean value from this random number generator's
     * sequence
     */
    boolean nextBoolean();

    /**
     * Returns the next pseudorandom, uniformly distributed <code>float
     * value between <code>0.0 and 1.0 from this random
     * number generator's sequence.
     *
     * @return  the next pseudorandom, uniformly distributed <code>float
     * value between <code>0.0 and 1.0 from this
     * random number generator's sequence
     */
    float nextFloat();

    /**
     * Returns the next pseudorandom, uniformly distributed
     * <code>double value between 0.0 and
     * <code>1.0 from this random number generator's sequence.
     *
     * @return  the next pseudorandom, uniformly distributed
     *  <code>double value between 0.0 and
     *  <code>1.0 from this random number generator's sequence
     */
    double nextDouble();

    /**
     * Returns the next pseudorandom, Gaussian ("normally") distributed
     * <code>double value with mean 0.0 and standard
     * deviation <code>1.0 from this random number generator's sequence.
     *
     * @return  the next pseudorandom, Gaussian ("normally") distributed
     * <code>double value with mean 0.0 and
     * standard deviation <code>1.0 from this random number
     *  generator's sequence
     */
    double nextGaussian();
}

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