jgap sudoku mutation operator

package lab1;

import java.util.List;
import java.util.Random;

import org.jgap.Gene;
import org.jgap.GeneticOperator;
import org.jgap.IChromosome;
import org.jgap.InvalidConfigurationException;
import org.jgap.Population;

public class SudokuSegmentMutationOperator implements GeneticOperator{

    private static final long serialVersionUID = 1L;
    private int brSegmenta;


    public SudokuSegmentMutationOperator(int brSegm){
        this.brSegmenta = brSegm;
    }

    public SudokuSegmentMutationOperator(){
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    @Override
    public void operate(Population a_population, List a_candidateChromosomes) {

        Random rand = new Random();
        int x = rand.nextInt(9);
        int y = rand.nextInt(9);


            IChromosome tempChrom = a_population.getChromosome(brSegmenta);

            Gene[] genes = tempChrom.getGenes();

            Gene tmpGene = genes[x];
            genes[x] = genes[y];
            genes[y] = tmpGene;

            try {
                tempChrom.setGenes(genes);
            } catch (InvalidConfigurationException e) {
                e.printStackTrace();
            }
            a_candidateChromosomes.add(tempChrom);


    }


}