Description: The sorting algorithm used by java.util.Arrays.sort and (indirectly) by java.util.Collections.sort has been replaced. The new sort implementation may throw an IllegalArgumentException if it detects a Comparable that violates the Comparable contract. The previous implementation silently ignored such a situation. If the previous behavior is desired, you can use the new system property, java.util.Arrays.useLegacyMergeSort, to restore previous mergesort behavior.
也就是说jdk 7的sort函数的实现变了,造成了这个问题,具体原因未知。
改一下系统设置,还是选择使用老版本的排序方法,在代码前面加上这么一句话:System.setProperty("java.util.Arrays.useLegacyMergeSort", "true");

1 对 “比较器报错:Comparison method violates its general contract”的想法;


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