Re: Checked Exceptions

From:

Eric Sosman <esosman@ieee-dot-org.invalid>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 14 Dec 2009 18:32:20 -0500

Message-ID:

<hg6i0t$v6u$1@news.eternal-september.org>

On 12/14/2009 2:22 PM, Leif Roar Moldskred wrote:

[...]
Then, give us some way to handle more than one type of exception in the
same catch statement. "catch( FooException, BarException, WeirdException ex ) { }"
or, hell, why not re-use the switch syntax?
   catch( IOException ex ) {
     case FileNotFoundException: logFileNotFound( ); break;
     case EOFException: logUnexpectedEof( ); break;
     default: logOtherIOError( );
   }
   catch( Exception ex ) {
     case FooException:
     case BarException: logFooBarError( ); break;
     case WeirdException: logWeirdError( ); break;
     default: logBadThingHappened( ); throw ex as unchecked;
   } // end catch( )

     The value of this escapes me. It seems you're not suggesting
a new capability, but just a new syntax for an existing capability:

    catch (FileNotFoundException ex) {
        logFileNotFound();
    } catch (EOFException ex) {
        logUnexpectedEof();
    } catch (IOException ex) {
        logOtherIOError();
    } catch (FooException ex) {
        logFooBarError();
    } catch (BarException ex) {
        logFooBarError();
    } catch (WeirdException ex) {
        logWeirdError();
    } catch (Exception ex) {
        logBadThingHappened();
    }

All you've saved is one call to logFooBarError -- or have I
missed something?

--
Eric Sosman
esosman@ieee-dot-org.invalid