java.util.Objects, round two (original) (raw)

Paul Benedict pbenedict at apache.org
Wed Oct 14 08:05:01 UTC 2009

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Joe,

I am confused over this warning:

* Warning: When a single object reference is supplied, the returned * value does not equal the hash code of that object reference. This * value can be computed by calling {@link #hashCode(Object)}.

I first looked into Arrays#deepHashCode and did not see any companion warning there; therefore I am presuming this is new functionality. Two questions remain based on looking at the javadoc alone and not knowing its implementation:

For when a single object reference is supplied:

1. Why is the hash code not the hash code of the single object? Is there harm in doing so?
2. Then what gets hashed? Dunno...

I think the second question is begged but not explicitly answered by the documentation.

Paul

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