Re: Autoboxing and Performance ?
On 08/21/2013 02:52 AM, Sven K=F6hler wrote:
That said, I seriously think that all the wrapper classes were just
intended for what the name suggests: wrapping a primitive type when you=
really need an Object. And most of the time you don't need an object.
I tend to agree. But that totally depends on the type of applications
you are dealing with.
Just as a data point: object types are not necessarily that expensive.
I once wrote a hash map with int as key type (basically copying
java.util.HashMap) just to find out that the performance difference to a =
standard HashMap with Integer as keys was negligible. (I don't remember =
all the details but I believe I also used values outside the cached range=
.)
I'd even call program is seriously broken if it uses Integer where int
could be used. I was never in need of a mutable Integer.
Then you probably never used reflection. Which is another good reason
to have java.lang.Integer and the like.
Cheers
robert
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