/*
 * Java Genetic Algorithm Library (@__identifier__@).
 * Copyright (c) @__year__@ Franz Wilhelmstötter
 *
 * Licensed 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Author:
 *    Franz Wilhelmstötter (franz.wilhelmstoetter@gmail.com)
 */
package io.jenetics.ext.engine;

import static io.jenetics.ext.util.Pareto.front;

import java.util.Comparator;
import java.util.stream.Collector;

import io.jenetics.Gene;
import io.jenetics.Phenotype;
import io.jenetics.engine.EvolutionResult;
import io.jenetics.util.ISeq;

import io.jenetics.ext.util.ParetoFront;

/**
 * @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
 * @version !__version__!
 * @since !__version__!
 */
public final class MOEA {

	private MOEA() {
	}

	public static<G extends Gene<?, G>, C extends Comparable<? super C>>
	Collector<EvolutionResult<G, C>, ?, ISeq<Phenotype<G, C>>>
	toParetoSet(final Comparator<? super C> dominance) {
		return Collector.of(
			() -> new ParetoFront<Phenotype<G, C>>(
				(a, b) -> dominance.compare(a.getFitness(), b.getFitness())
			),
			(set, result) -> set.addAll(front(result.getPopulation()).asList()),
			ParetoFront::merge,
			ParetoFront::toISeq
		);
	}

}

@@ -1627,16 +1627,38 @@
 lation()
+, Phenotype::compareTo
 ).asList

Fix compile error.