11 lines
631 B
Plaintext
11 lines
631 B
Plaintext
According to the Java ``Comparable.compareTo(T o)`` documentation:
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{quote}
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It is strongly recommended, but not strictly required that ``(x.compareTo(y)==0) == (x.equals(y))``.
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Generally speaking, any class that implements the Comparable interface and violates this condition should clearly indicate this fact.
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The recommended language is "Note: this class has a natural ordering that is inconsistent with equals."
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{quote}
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If this rule is violated, weird and unpredictable failures can occur.
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For example, in Java 5 the ``PriorityQueue.remove()`` method relied on ``compareTo()``, but since Java 6 it has relied on ``equals()``.
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