我可以为您翻译。以下是需要翻译的内容:
我有这段代码:
package org.optimization.geneticAlgorithm;
import org.optimization.geneticAlgorithm.selection.Pair;
public abstract class Chromosome implements Comparable<Chromosome> {
public abstract double fitness();
public abstract Pair<Chromosome> crossover(Chromosome parent);
public abstract void mutation();
public int compareTo(Chromosome o) {
int rv = 0;
if (this.fitness() > o.fitness()) {
rv = -1;
} else if (this.fitness() < o.fitness()) {
rv = 1;
}
return rv;
}
}
每次运行这段代码时我都会得到这个错误:
Exception in thread "main" java.lang.IllegalArgumentException: Comparison method violates its general contract!
at java.util.ComparableTimSort.mergeHi(ComparableTimSort.java:835)
at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:453)
at java.util.ComparableTimSort.mergeCollapse(ComparableTimSort.java:376)
at java.util.ComparableTimSort.sort(ComparableTimSort.java:182)
at java.util.ComparableTimSort.sort(ComparableTimSort.java:146)
at java.util.Arrays.sort(Arrays.java:472)
at java.util.Collections.sort(Collections.java:155)
at org.optimization.geneticAlgorithm.GeneticAlgorithm.nextGeneration(GeneticAlgorithm.java:74)
at org.optimization.geneticAlgorithm.GeneticAlgorithm.execute(GeneticAlgorithm.java:40)
at test.newData.InferenceModel.main(InferenceModel.java:134)
我使用OpenJDK7u3,当对象相等时返回0。有人能解释一下这个错误吗?
fitness()
方法是否总是返回相同的值,无论在同一对象上调用多少次?你能与我们分享实现吗? - Tomasz Nurkiewicz