mistaking switch expressions and switch statements

[Mateusz Romanowski]

Hi Cay,
Actually, my initial concern was about that figure's mislabeling.

As for the fall-through, it has become so complicated that I had to use
`javap` to confirm lack of fall-through.. lots of axis, indeed.

Cheers,
Mateusz

On Saturday, February 5, 2022, Cay Horstmann <cay.horstmann at gmail.com>
wrote:

> The article has other issues. Figure 6 is captioned "Handling complex
> situations with a switch expression" but contains a switch *statement*
> without fall-through.
>
> Another example where the two axis design (statement vs. expression,
> fall-through vs. no fall-through) has not been properly understood.
>
> Cheers,
>
> Cay
>
> On 04/02/2022 22:59, Brian Goetz wrote:
>
>> You are correct that the default can be elided here, because this is a
>> switch statement on a legacy target type whose labels are all constants,
>> and such statements (for reasons of backward compatibility) can be
>> partial.  All other switches (new target types, new cases, expressions)
>> should be total.
>>
>> The example actually employs "belts and suspenders"; it initializes
>> `discount` to zero, and then assigns it to zero in the default clause. If
>> discount were left blank, then the default clause would be necessary, not
>> to make the switch total, but to make `discount` definitely assigned.  So
>> you could either elide the initializer on `discount`, or the default
>> clause, but not both.
>>
>> On 2/4/2022 4:31 PM, Mateusz Romanowski wrote:
>>
>>> Hi,
>>> I am reading article "Design implications of Java’s switch statements and
>>> switch expressions" [1] by Vasily STRELNIKOV .
>>>
>>> I am confounded by "*Figure 6.* Handling complex situations with a Switch
>>> Expression" which I believe is a new-style Switch Statement as the
>>> `default
>>> clause` is removable even though Switch is not total.
>>>
>>> Could you confirm my interpretation?
>>> And should it be correct, help to contact author to ask for correction.
>>>
>>> Cheers,
>>> Mateusz Romanowski
>>>
>>> [1]
>>> https://blogs.oracle.com/javamagazine/post/java-switch-state
>>> ments-expressions
>>>
>>
>>
> --
>
> Cay S. Horstmann | http://horstmann.com | mailto:cay at horstmann.com
>