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Java example source code file (ChromosomeTest.java)

This example Java source code file (ChromosomeTest.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, chromosometest, dummychromosome, listpopulation, override, population, test, util

The ChromosomeTest.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.List;

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

public class ChromosomeTest {

    @Test
    public void testCompareTo() {
        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 10;
            }
        };

        Assert.assertTrue(c1.compareTo(c2) < 0);
        Assert.assertTrue(c2.compareTo(c1) > 0);
        Assert.assertEquals(0,c3.compareTo(c2));
        Assert.assertEquals(0,c2.compareTo(c3));
    }

    private abstract static class DummyChromosome extends Chromosome {
        private final int repr;

        public DummyChromosome(final int repr) {
            this.repr = repr;
        }
        @Override
        protected boolean isSame(Chromosome another) {
            return ((DummyChromosome) another).repr == repr;
        }
    }

    @Test
    public void testFindSameChromosome() {
        Chromosome c1 = new DummyChromosome(1) {
            public double fitness() {
                return 1;
            }
        };
        Chromosome c2 = new DummyChromosome(2) {
            public double fitness() {
                return 2;
            }
        };
        Chromosome c3 = new DummyChromosome(3) {
            public double fitness() {
                return 3;
            }
        };
        Chromosome c4 = new DummyChromosome(1) {
            public double fitness() {
                return 5;
            }
        };
        Chromosome c5 = new DummyChromosome(15) {
            public double fitness() {
                return 15;
            }
        };

        List<Chromosome> popChr = new ArrayList();
        popChr.add(c1);
        popChr.add(c2);
        popChr.add(c3);
        Population pop = new ListPopulation(popChr,3) {
            public Population nextGeneration() {
                // not important
                return null;
            }
        };

        Assert.assertNull(c5.findSameChromosome(pop));
        Assert.assertEquals(c1, c4.findSameChromosome(pop));

        c4.searchForFitnessUpdate(pop);
        Assert.assertEquals(1, c4.getFitness(),0);
    }

}

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