一个关于Java中SortedMap定义的问题
在SortedMap接口的解释中有这么一段话：
1
466 * Note that the ordering maintained by a sorted map (whether or not an
* explicit comparator is provided) must be consistent with equals if
* the sorted map is to correctly implement the Map interface. (See
* the Comparable interface or Comparator interface for a
* precise definition of consistent with equals.) This is so because
* the Map interface is defined in terms of the equals
* operation, but a sorted map performs all key comparisons using its
* compareTo (or compare) method, so two keys that are
* deemed equal by this method are, from the standpoint of the sorted map,
* equal. The behavior of a tree map is well-defined even if its
* ordering is inconsistent with equals; it just fails to obey the general
* contract of the Map interface.
请问这段话是什么意思？
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就是要求map里面的对象，做compareTo和equals来比较的时候结果是一致的。比如compareTo返回0，那么equal一定是true。但有的对象可不是这样的，比如BigDecimal