16 lines
650 B
Plaintext
16 lines
650 B
Plaintext
According to the Java ``++Comparable.compareTo(T o)++`` documentation:
|
|
|
|
|
|
____
|
|
It is strongly recommended, but not strictly required that ``++(x.compareTo(y)==0) == (x.equals(y))++``.
|
|
|
|
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."
|
|
|
|
____
|
|
|
|
If this rule is violated, weird and unpredictable failures can occur.
|
|
|
|
For example, in Java 5 the ``++PriorityQueue.remove()++`` method relied on ``++compareTo()++``, but since Java 6 it has relied on ``++equals()++``.
|