java - 重写compareTo有什么影响？

Question

我知道如果重写 equals，hashCode 也应该被重写。是否有任何类似的规则适用于覆盖compareTo？

这是一个Java问题。

Answer 1

它的期望可以在这里阅读:http://docs.oracle.com/javase/7/docs/api/java/lang/Comparable.html

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It is strongly recommended (though not required) that natural orderings be consistent with equals. This is so because sorted sets (and sorted maps) without explicit comparators behave "strangely" when they are used with elements (or keys) whose natural ordering is inconsistent with equals. In particular, such a sorted set (or sorted map) violates the general contract for set (or map), which is defined in terms of the equals method.