Sized (original) (raw)

Brian Goetz brian.goetz at oracle.com
Fri Nov 2 15:22:24 PDT 2012

Of course, some collections, like the key set of a ConcurrentHashMap, don't know their size any more than a garden-variety Iterable does.

That's not exactly true. In the absence of interference from concurrent modification, the key set of a CHM absolutely knows its size. It's just that in the presence of interference, the reported size may be stale by the time you receive it.

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