home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (RandomAdaptorTest.java)

This example Java source code file (RandomAdaptorTest.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.

Learn more about this Java project at its project page.

Java - Java tags/keywords

constantgenerator, randomadaptor, randomadaptortest, randomgenerator, test, util

The RandomAdaptorTest.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;

import java.util.Random;

import org.junit.Assert;
import org.junit.Test;

/**
 * Test cases for the RandomAdaptor class
 *
 */

public class RandomAdaptorTest {

    @Test
    public void testAdaptor() {
        ConstantGenerator generator = new ConstantGenerator();
        Random random = RandomAdaptor.createAdaptor(generator);
        checkConstant(random);
        RandomAdaptor randomAdaptor = new RandomAdaptor(generator);
        checkConstant(randomAdaptor);
    }

    private void checkConstant(Random random) {
        byte[] bytes = new byte[] {0};
        random.nextBytes(bytes);
        Assert.assertEquals(0, bytes[0]);
        Assert.assertFalse(random.nextBoolean());
        Assert.assertEquals(0, random.nextDouble(), 0);
        Assert.assertEquals(0, random.nextFloat(), 0);
        Assert.assertEquals(0, random.nextGaussian(), 0);
        Assert.assertEquals(0, random.nextInt());
        Assert.assertEquals(0, random.nextInt(1));
        Assert.assertEquals(0, random.nextLong());
        random.setSeed(100);
        Assert.assertEquals(0, random.nextDouble(), 0);
    }

    /*
     * "Constant" generator to test Adaptor delegation.
     * "Powered by Eclipse ;-)"
     *
     */
    public static class ConstantGenerator implements RandomGenerator {

        private final double value;

        public ConstantGenerator() {
            value = 0;
        }

        public ConstantGenerator(double value) {
            this.value = value;
        }

        public boolean nextBoolean() {
            return false;
        }

        public void nextBytes(byte[] bytes) {
        }

        public double nextDouble() {
            return value;
        }

        public float nextFloat() {
            return (float) value;
        }

        public double nextGaussian() {
            return value;
        }

        public int nextInt() {
            return (int) value;
        }

        public int nextInt(int n) {
            return (int) value;
        }

        public long nextLong() {
            return (int) value;
        }

        public void setSeed(int seed) {
        }

        public void setSeed(int[] seed) {
        }

        public void setSeed(long seed) {
        }

    }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java RandomAdaptorTest.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.