org.jgap.gp.impl

Class GPProgramFitnessComparator

java.lang.Object

org.jgap.gp.impl.GPProgramFitnessComparator

All Implemented Interfaces:

java.util.Comparator

public class GPProgramFitnessComparator
extends java.lang.Object
implements java.util.Comparator

Simple comparator to allow the sorting of GPProgram lists with the highest fitness value in first place of the list. Usage example: Arrays.sort( population.getGPPrograms(), new GPProgramFitnessComparator() );

Since:

3.0

Constructor Summary

Constructors

Constructor and Description
GPProgramFitnessComparator() Constructs the comparator using the DefaultFitnessEvaluator
GPProgramFitnessComparator(IGPFitnessEvaluator a_evaluator)

Method Summary

Modifier and Type	Method and Description
int	compare(java.lang.Object a_program1, java.lang.Object a_program2) Compares two programs by using a FitnessEvaluator.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

GPProgramFitnessComparator

public GPProgramFitnessComparator()

Constructs the comparator using the DefaultFitnessEvaluator

Since:

3.0

GPProgramFitnessComparator

public GPProgramFitnessComparator(IGPFitnessEvaluator a_evaluator)

Parameters:

a_evaluator - the fitness evaluator to use

Since:

3.0

Method Detail

compare

public int compare(java.lang.Object a_program1,
                   java.lang.Object a_program2)

Compares two programs by using a FitnessEvaluator.

Specified by:

compare in interface java.util.Comparator

Parameters:

a_program1 - the first program to compare

a_program2 - the second program to compare

Returns:

-1 if a_program1 is fitter than a_program2, 1 if it is the other way round and 0 if both are equal

Since:

3.0