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Bug
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Resolution: Fixed
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P4
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None
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b35
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Not verified
Collection.toArray() is specified to return an object of type Object[], but since arrays are covariant, that requirement is met by any array of a subtype of Object, for example, String[].
It's subtle, but it's clearly, if not explicitly, a bug to return an array of a subtype. SeeJDK-6260652.
Interestingly, the specification for toArray(T[]) says
Note that toArray(new Object[0]) is identical in function to toArray().
which is a fine statement, but it's in the wrong place. There should be a requirement in the toArray() spec that it returns an instance whose runtime type is precisely Object[].
It's subtle, but it's clearly, if not explicitly, a bug to return an array of a subtype. See
Interestingly, the specification for toArray(T[]) says
Note that toArray(new Object[0]) is identical in function to toArray().
which is a fine statement, but it's in the wrong place. There should be a requirement in the toArray() spec that it returns an instance whose runtime type is precisely Object[].
- csr for
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JDK-8192841 Collection.toArray() spec should be explicit about returning precisely an Object[]
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- Closed
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- relates to
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- Closed
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- Closed
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