On 25/02/2015 7:33 PM, Noctarius wrote:
Hey guys,
Sorry for crashing into the mailinglist but by looking at the Java
specification we're not really sure about it. I guess it might be
well defined but we want to make sure.
You are asking a question about the language rather than the libraries,
but we don't have a specific mailing list for language discussions.
Looking at the following example we see a non natural ordered case
for fall-through. Looking at the spec there is an example which
defines the fall-through behavior, unfortunately the example uses a
natural ordered list of numbers.
switch(age){
case 0:
case 2:
case 4:
case 6: println("even");break;
case 1:
case 3:
case 5: println("uneven");break;
default: ....
}
In our example we do not have this behavior. We are sure the Java
compiler will compile it as it is above but Hotspot applies, as far
as I know, reordering on cases depending on the frequency of usage.
I expect it to only reorder fall-through blocks or let's call it
blocks without any order-dependency but is this how it works? Is
this case covered by the spec? Maybe it needs another example to
make it clear.
Ordering is irrelevant. The code generated will execute the logic as
specified:
if (age==0 || age==2 || age==4 || age==6)
println("even");
else if (age==1 || age==3 || age==5)
println("uneven");
else
// default ...
David
-----
Thanks
Chris
