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Java example source code file (ListPopulationTest.java)

This example Java source code file (ListPopulationTest.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

arraylist, chromosome, iterator, listpopulation, listpopulationtest, population, test, util

The ListPopulationTest.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.genetics;


import java.util.ArrayList;
import java.util.Iterator;

import org.apache.commons.math3.exception.NotPositiveException;
import org.apache.commons.math3.exception.NumberIsTooLargeException;
import org.apache.commons.math3.exception.NumberIsTooSmallException;
import org.junit.Assert;
import org.junit.Test;

public class ListPopulationTest {

    @Test
    public void testGetFittestChromosome() {
        Chromosome c1 = new Chromosome() {
            public double fitness() {
                return 0;
            }
        };
        Chromosome c2 = new Chromosome() {
            public double fitness() {
                return 10;
            }
        };
        Chromosome c3 = new Chromosome() {
            public double fitness() {
                return 15;
            }
        };

        ArrayList<Chromosome> chromosomes = new ArrayList ();
        chromosomes.add(c1);
        chromosomes.add(c2);
        chromosomes.add(c3);

        ListPopulation population = new ListPopulation(chromosomes, 10) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };

        Assert.assertEquals(c3, population.getFittestChromosome());
    }

    @Test
    public void testChromosomes() {
        final ArrayList<Chromosome> chromosomes = new ArrayList ();
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));

        final ListPopulation population = new ListPopulation(10) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };

        population.addChromosomes(chromosomes);

        Assert.assertEquals(chromosomes, population.getChromosomes());
        Assert.assertEquals(chromosomes.toString(), population.toString());

        population.setPopulationLimit(50);
        Assert.assertEquals(50, population.getPopulationLimit());
    }

    @Test(expected = NotPositiveException.class)
    public void testSetPopulationLimit() {
        final ListPopulation population = new ListPopulation(10) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };

        population.setPopulationLimit(-50);
    }

    @Test(expected = NotPositiveException.class)
    public void testConstructorPopulationLimitNotPositive() {
        new ListPopulation(-10) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };
    }

    @Test(expected = NotPositiveException.class)
    public void testChromosomeListConstructorPopulationLimitNotPositive() {
        final ArrayList<Chromosome> chromosomes = new ArrayList ();
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        new ListPopulation(chromosomes, -10) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };
    }

    @Test(expected = NumberIsTooLargeException.class)
    public void testConstructorListOfChromosomesBiggerThanPopulationSize() {
        final ArrayList<Chromosome> chromosomes = new ArrayList ();
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        new ListPopulation(chromosomes, 1) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };
    }

    @Test(expected=NumberIsTooLargeException.class)
    public void testAddTooManyChromosomes() {
        final ArrayList<Chromosome> chromosomes = new ArrayList ();
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));

        final ListPopulation population = new ListPopulation(2) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };

        population.addChromosomes(chromosomes);
    }

    @Test(expected=NumberIsTooLargeException.class)
    public void testAddTooManyChromosomesSingleCall() {

        final ListPopulation population = new ListPopulation(2) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };

        for (int i = 0; i <= population.getPopulationLimit(); i++) {
            population.addChromosome(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        }
    }

    @Test(expected = UnsupportedOperationException.class)
    public void testIterator() {
        final ArrayList<Chromosome> chromosomes = new ArrayList();
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));

        final ListPopulation population = new ListPopulation(10) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };

        population.addChromosomes(chromosomes);

        final Iterator<Chromosome> iter = population.iterator();
        while (iter.hasNext()) {
            iter.next();
            iter.remove();
        }
    }

    @Test(expected=NumberIsTooSmallException.class)
    public void testSetPopulationLimitTooSmall() {
        final ArrayList<Chromosome> chromosomes = new ArrayList ();
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));
        chromosomes.add(new DummyBinaryChromosome(BinaryChromosome.randomBinaryRepresentation(3)));

        final ListPopulation population = new ListPopulation(chromosomes, 3) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };

        population.setPopulationLimit(2);
    }

}

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