Comparison method violates its general contract 解决

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Comparison method violates its general contract 解决

java.lang.IllegalArgumentException: Comparison method violates its general contract! 原因 JDK7中的Collections.Sort方法实现中,如果两个值是相等的,那么compare方法需要返回0,否则可能会在排序时抛错,而JDK6是没有这个限制的. 在 JDK7 版本以上,Comparator 要满足自反性,传递性,对称性,不然 Arrays.sort, Collections.sort 会报 Ille…

解决“Comparison method violates its general contract!”

The ONE跑MaxProp.Prophet可能(取决于你JDK的版本)会报“java.lang.IllegalArgumentException: Comparison method violates its general contract!”错误,导致无法仿真. Exception in thread "main" java.lang.IllegalArgumentException: Comparison method violates its general contrac…

解决 Comparison method violates its general contract!

问题:Comparison method violates its general contract!报错 Collections.sort(list, new Comparator<Integer>() { @Override public int compare(Integer o1, Integer o2) { : -;// 错误的方式 } }); 解决方案先说如何解决,解决方式有两种. 修改代码上面代码写的本身就有问题,第4行没有考虑o1 == o2的情况,再者说我们不需要自己去比…

JDK7的Comparison method violates its general contract异常

1.摘要前一阵遇到了一个使用Collections.sort()时报异常的问题,跟小伙伴@zhuidawugui 一起排查了一下,发现问题的原因是JDK7的排序实现改为了TimSort,之后我们又进一步研究了一下这个神奇的算法. 2.背景先说一下为什么要研究这个异常,前几天线上服务器发现日志里有偶发的异常: 1 2 3 4 5 6 7 8 9 java.lang.IllegalArgumentException: Comparison method violates its genera…

mysql性能优化及 Comparison method violates its general contract

项目上嵌套结果集查询,查询的列表再根据每个id进行查询计算,嵌套的sql如下: SELECT SUM(IFNULL(t.out_rate,0)) totalOutRate, SUM(IF(IFNULL(t.pre_power,0)-IFNULL(t.power,0)<0,0,IFNULL(t.pre_power,0)-IFNULL(t.power,0))) totalPower FROM ( SELECT i.id id,i.`station_id` station_id,i.`out_rate…

java-collections.sort异常Comparison method violates its general contract!

转载:http://www.tuicool.com/articles/MZreyuv 异常信息 java.lang.IllegalArgumentException: Comparison method violates its general contract! at java.util.TimSort.mergeHi(TimSort.java:868) at java.util.TimSort.mergeAt(TimSort.java:485) at java.util.TimSort.me…