try-with-resources and null resource (original) (raw)
Joe Darcy joe.darcy at oracle.com
Wed Jan 26 10:01:23 PST 2011
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On 1/26/2011 7:53 AM, Jesper Öqvist wrote:
Rémi Forax wrote:
On 01/21/2011 07:24 PM, Paul Benedict wrote:
The NPE is more useful than the language silently doing nothing with a null pointer. While your idea is convenient, I believe it assumes too much. If anything, perhaps the language shouldn't allow an explicit null assignment in a try-with-resources block. Hi Paul, the null assignement is just an example. Perhaps, you prefer this one: 4. try(AutoCloseable c = getAnAutoCloseableThatMayBeNull()) { 5. // nothing 6. } Rémi I am concerned about the consistency between what the programmer expects and what the compiler produces. It seems to me that the following code should be legal, and execute without throwing an NPE: try (Resource r = null) { r = new SomeResource(); }
This code will be rejected by the compiler since r is implicitly final and thus the assignment to r inside the block will be reported as erroneous.
-Joe
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