Multi-catch/final rethrow

[joe.darcy at oracle.com]

If you have a question on what is today legal syntax, your friendly 
neighborhood java compiler can help you answer that question :-)

-Joe

On 5/6/2010 12:45 PM, Ulf Zibis wrote:
> No answer for my questions?  :-(
>
> -Ulf
>
>
> Am 04.05.2010 11:30, schrieb Ulf Zibis:
>> Am 04.05.2010 02:25, schrieb joe.darcy at oracle.com:
>>   
>>> Greetings,
>>>
>>> As alluded to as a possibility previously [1], I'm happy to announce
>>> that improved exception handling with multi-catch and final rethrow 
>>> will
>>> be part of an upcoming JDK 7 build.
>>>
>>>      
>> Great!
>>
>>   
>>>             } else {
>>>                 throw (Throwable)new Exception();
>>>
>>>      
>> I'm wondering that a cast to a throw is valid syntax, or _in other
>> words_, what should such a syntax be good for ???
>> In fact, an Exception instance is thrown, and should be caught by catch
>> (Exception e). Or not ?
>>
>>
>>   
>>> To address this, the third clause is changed to
>>>
>>>
>>>     
>>>> - is a subtype/supertype of one of the types in the declaration of the
>>>> catch  parameter
>>>>
>>>>        
>> Does that mean, that following variation wouldn't rethrow
>> Exception("b3") (and (Throwable)new Exception() too?),
>> as it is nor subtype nor supertype of Exception, as it is itself ?
>> That IMO would be weird syntax.
>>
>> class Neg04 {
>>       static class A extends Exception {}
>>       static class B extends Exception {}
>>
>>       void test(boolean b1, boolean b2, boolean b3) throws B {
>>           try {
>>               if (b1) {
>>                   throw new A();
>>               } else if (b2) {
>>                   throw new B();
>>               } else if (b3) {
>>                   throw new Exception("b3");
>>               } else {
>>                   throw (Throwable)new Exception();
>>               }
>>           }
>>           catch (A e) {}
>>           catch (final Exception e) {
>>               throw e;
>>           }
>>           catch (Throwable t) {}
>>       }
>> }
>>
>>
>> -Ulf
>>
>>
>>
>>
>>    
>