Package org.uma.jmetal.util.comparator

Class ConstraintViolationComparator<S extends Solution<?>>

java.lang.Object
org.uma.jmetal.util.comparator.ConstraintViolationComparator<S>
All Implemented Interfaces:
java.util.Comparator<S>
public class ConstraintViolationComparator<S extends Solution<?>>
extends java.lang.Object
implements java.util.Comparator<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
    ConstraintViolationComparator()  

  • 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

  • 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 java.util.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.