Multi-catch/final rethrow

[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