Re: Speed of interfaces vs inheritance

Mike Schilling wrote:
"Chris" <spam_me_not@xxxxxxxxxx> wrote in message news:4596b7a9$0$1612$9a6e19ea@xxxxxxxxxxxxxxxxxxxxxxx
In a particularly time-critical part of my app I need to call a method on an external class in a tight loop. The class can be different in different contexts. I've got two choices: create an interface and have the various different classes implement it, or create an abstract class and have the various different classes extend it.

I seem to recall, in years past, that the interface approach was slower. Is this still the case?

(In this particular situation, either approach works fine, though I personally like the interface approach better).

The only way to answer this question is to write a test.

Yeah, but write a good one...

FWIW, a couple years ago I tested dynamically loading a class through a class loader and having a loop repeatedly calling an (interface) method which threw an exception. Under the Sun server HotSpot, the loop was eliminated. Client performance wasn't too bad either.

I believe interface methods can get slow where the same runtime class is called through a number of different interfaces. A highly unlikely situations, particularly if you were considering an abstract base class.

Tom Hawtin
.

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