相关疑难解决方法(0)

以下程序抛出以下异常:

java.lang.IllegalArgumentException: Comparison method violates its general contract!

我理解了这个问题Comparator.请参阅无法复制:"比较方法违反了其总合同!"

我不明白为什么只有List32或更大的s 才会失败.谁能解释一下？

class Experiment {

    private static final class MyInteger {
        private final Integer num;

        MyInteger(Integer num) {
            this.num = num;
        }
    }

    private static final Comparator<MyInteger> COMPARATOR = (r1, r2) -> {
        if (r1.num == null || r2.num == null)
            return 0;
        return Integer.compare(r1.num, r2.num);
    };

    public static void main(String[] args) {
        MyInteger[] array = {new MyInteger(0), new MyInteger(1), new MyInteger(null)};
        Random random = new …