Package org.uma.jmetal.util.comparator.constraintcomparator.impl

Class OverallConstraintViolationDegreeComparator<S extends Solution<?>>

java.lang.Object

org.uma.jmetal.util.comparator.constraintcomparator.impl.OverallConstraintViolationDegreeComparator<S>

All Implemented Interfaces:

Comparator<S>, ConstraintComparator<S>

public class OverallConstraintViolationDegreeComparator<S extends Solution<?>>
extends Object
implements ConstraintComparator<S>

This class implements a Comparator (a method for comparing Solution objects) based on the overall constraint violation of the solutions, as done in NSGA-II.

Author:

Antonio J. Nebro

Constructor Summary

Constructors

Constructor	Description
OverallConstraintViolationDegreeComparator()

Method Summary

Modifier and Type	Method	Description
int	compare(S solution1, S solution2)	Compares two solutions.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Details

OverallConstraintViolationDegreeComparator

public OverallConstraintViolationDegreeComparator()

Method Details

compare

public int compare(S solution1,
 S solution2)

Compares two solutions. If the solutions has no constraints the method return 0

Specified by:

compare in interface Comparator<S extends Solution<?>>

Parameters:

solution1 - Object representing the first Solution.

solution2 - Object representing the second Solution.

Returns:

-1 if the overall constraint violation degree of solution1 is higher than the one of solution2, 1 in the opposite case, and 0 if they have the same value (this case applies when the two compared solutions have no constraints). Note that the violation degree is a negative number, so when comparing to two solutions, the higher the value the better.