Question on layer/peeling
vitalyd at gmail.com
Wed Jan 7 13:44:45 UTC 2015
Not sure that's ideal as the implementation may not be using entry objects
to store things (e.g. open addressed version with parallel arrays for keys
and values); this would cause the get method to allocate an entry for each
get operation. If the entry impl is a value type it'll be boxed since it's
assigned to an interface.
Sent from my phone
On Jan 7, 2015 3:03 AM, "Ali Ebrahimi" <ali.ebrahimi1781 at gmail.com> wrote:
> Or add method
> Map.Entry<K,V> getEntry(key)
> On Wed, Jan 7, 2015 at 2:15 AM, Brian Goetz <brian.goetz at oracle.com>
>> By the way, C# solves this by having TryGet type of methods that return a
>>> boolean indicating success (I.e. found mapping) and set an out parameter
>>> the value found. You'd need a lightweight tuple or multi return to do
>>> same in java, I think.
>> Right, there's two ways to fix get():
>> - Using the getOrDefault(key, sentinel) // added in Java 8
>> - Using some sort of optional-like return type
>> Not quite at that part of the road yet.
> Best Regards,
> Ali Ebrahimi
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