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Commons Math example source code file (

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

Java - Commons Math tags/keywords

fixedgenerationcount, fixedgenerationcount, illegalargumentexception, illegalargumentexception, stoppingcondition, stoppingcondition, the, the

The Commons Math 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.math.genetics;

 * Stops after a fixed number of generations.  Each time
 * {@link #isSatisfied(Population)} is invoked, a generation counter is
 * incremented.  Once the counter reaches the configured
 * <code>maxGenerations value, {@link #isSatisfied(Population)} returns
 * true.
 * @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
 * @since 2.0
public class FixedGenerationCount implements StoppingCondition {
    /** Number of generations that have passed */
    private int numGenerations = 0;

    /** Maximum number of generations (stopping criteria) */
    private final int maxGenerations;

     * Create a new FixedGenerationCount instance.
     * @param maxGenerations number of generations to evolve
    public FixedGenerationCount(int maxGenerations) {
        if (maxGenerations <= 0)
            throw new IllegalArgumentException("The number of generations has to be >= 0");
        this.maxGenerations = maxGenerations;

     * Determine whether or not the given number of generations have passed.
     * Increments the number of generations counter if the maximum has not
     * been reached.
     * @param population ignored (no impact on result)
     * @return <code>true IFF the maximum number of generations has been exceeded
    public boolean isSatisfied(Population population) {
        if (this.numGenerations < this.maxGenerations) {
            return false;
        return true;

     * @return the number of generations that have passed
    public int getNumGenerations() {
        return numGenerations;


Other Commons Math examples (source code examples)

Here is a short list of links related to this Commons Math source code file:

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