Re: HashMap get/put
Peter Duniho wrote:
Mike Schilling wrote:
Peter Duniho wrote:
Thomas Pornin wrote:
The Java compiler emits an invokevirtual opcode even for a final
method, because the class which contains the final method and
against
which the call site is compiled may be substituted later on with
another version which lacks the 'final'.
I'm afraid I don't understand how that can be. If you have a type
known at compile time to have a final method, how can that type be
substituted later on with a version in which that method is not
final? Do you have to do something with a special class loader?
Or
is there actually language (as opposed to framework) support for
doing that?
The called class might haver changed at run-time; such a change
doesn't require that the caller be recompiled.
That seems like a serious versioning problem. What happens if you
have a class where the method is changed from non-final to final?
Does code compiled with that class previous still get to override
the
now-final method?
I think it'll fail to load, but I wouldn't swear to it.
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