Am 12.01.2016 um 01:45 schrieb Schalk Cronjé:
I did not know there was even a difference. I tend to prefer 'as TYPE'
for IMO it reads better than '(TYPE)'. Maybe it is also left-over from
my C++ days where the latetr style cast was inherited from C and frowned
upon.
Is this 'cheap & fast' casting only affecting native types or is it
casting in general?
That's in general
an example to show how big the difference can be, even if they both give
the same result:
int i = 1
long l = (long) i
for a case like this we usually use the bytecode instrcution I2L
int i = 1
long l = i as long
This will call Integer.asType(long), most likely falling back to a cast
done by DefaultTypeTransformation. This means a dynamic method call to
asType, plus a long winded logic for the conversion itself (there are
worse cases involving reflection).
I2L is by orders cheaper as a dynamic method call.
bye Jochen
