2020-12-23 14:59:06 +01:00
|
|
|
According to the Java ``Comparable.compareTo(T o)`` documentation:
|
2020-06-30 12:47:33 +02:00
|
|
|
|
|
|
|
|
{quote}
|
2020-12-23 14:59:06 +01:00
|
|
|
It is strongly recommended, but not strictly required that ``(x.compareTo(y)==0) == (x.equals(y))``.
|
2020-06-30 12:47:33 +02:00
|
|
|
Generally speaking, any class that implements the Comparable interface and violates this condition should clearly indicate this fact.
|
|
|
|
|
The recommended language is "Note: this class has a natural ordering that is inconsistent with equals."
|
|
|
|
|
{quote}
|
|
|
|
|
|
|
|
|
|
If this rule is violated, weird and unpredictable failures can occur.
|
2020-12-23 14:59:06 +01:00
|
|
|
For example, in Java 5 the ``PriorityQueue.remove()`` method relied on ``compareTo()``, but since Java 6 it has relied on ``equals()``.
|
