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please help understanding syntax

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  please help understanding syntax John Goche <johngoche99@googlemail.com> - 2012-01-07 13:15 -0800
    Re: please help understanding syntax Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-01-07 13:58 -0800
    Re: please help understanding syntax Roedy Green <see_website@mindprod.com.invalid> - 2012-01-07 14:28 -0800
    Re: please help understanding syntax Steven Simpson <ss@domain.invalid> - 2012-01-07 22:55 +0000
      Re: please help understanding syntax Lew <noone@lewscanon.com> - 2012-01-07 20:58 -0800
      Re: please help understanding syntax Steven Simpson <ss@domain.invalid> - 2012-01-08 08:25 +0000
      Re: please help understanding syntax Roedy Green <see_website@mindprod.com.invalid> - 2012-01-16 02:05 -0800

#11089 — please help understanding syntax

Hello,

I am looking at the java code on the following page:

http://gnuc.in/resources/archives/1404

There I find the following, but I do not
understand the syntax Auth.background() { ... }

public void checkAccount(final Account account)
{
    Auth.background()
    {
        @Override
        public void run()
        {
            Auth.checkAccount(account, this, new CustomCallback()
            {
                @Override
                public void handle(int resultCode)
                {
       // ...
                }
            });
        }
    });
}

Can someone please explain the syntax Auth.background() { ... } .
I understand the rest of the syntax.

Thanks,

John Goche

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#11090

On Sat, 7 Jan 2012 13:15:43 -0800 (PST), John Goche wrote:

> [...]
> Can someone please explain the syntax Auth.background() { ... } .
> I understand the rest of the syntax.

The search term you are looking for is "anonymous inner class".

That should help you find lots of useful references online.

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#11091

On Sat, 7 Jan 2012 13:15:43 -0800 (PST), John Goche
<johngoche99@googlemail.com> wrote, quoted or indirectly quoted
someone who said :

>Can someone please explain the syntax Auth.background() { ... } .
>I understand the rest of the syntax.

see http://mindprod.com/jgloss/anonymousclasses.html
-- 
Roedy Green Canadian Mind Products
http://mindprod.com
If you can't remember the name of some method, 
consider changing it to something you can remember.
 

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#11094

On 07/01/12 21:15, John Goche wrote:
> public void checkAccount(final Account account)
> {
>      Auth.background()
>      {
>          @Override
>          public void run()
>          {
>              Auth.checkAccount(account, this, new CustomCallback()
>              {
>                  @Override
>                  public void handle(int resultCode)
>                  {
>         // ...
>                  }
>              });
>          }
>      });
> }
>
> Can someone please explain the syntax Auth.background() { ... } .

It's a syntax error, surely?  Try sticking it in a syntax-aware editor 
with a 'class X { }' around it.  When I add the closing brace in emacs, 
I'm told "Mismatched parentheses".

Perhaps it's supposed to be 'new Auth.background()', though that's an 
unconventional name for a class.

Perhaps it's supposed to be 'new Auth.background(new Runnable() { ...'.

...

-- 
ss at comp dot lancs dot ac dot uk

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#11102

Steven Simpson wrote:
> John Goche wrote:
>> public void checkAccount(final Account account)
>> {
>> Auth.background()
>> {
>> @Override
>> public void run()
>> {
>> Auth.checkAccount(account, this, new CustomCallback()
>> {
>> @Override
>> public void handle(int resultCode)
>> {
>> // ...
>> }
>> });
>> }
>> });
>> }
>>
>> Can someone please explain the syntax Auth.background() { ... } .
>
> It's a syntax error, surely? Try sticking it in a syntax-aware editor with a
> 'class X { }' around it. When I add the closing brace in emacs, I'm told
> "Mismatched parentheses".
>
> Perhaps it's supposed to be 'new Auth.background()', though that's an
> unconventional name for a class.
>
> Perhaps it's supposed to be 'new Auth.background(new Runnable() { ...'.
>
> ...

Whatever it's supposed to be, the code at that site is not compilable, nor 
does the author even provide complete classes. It is evidence that mere 
presence on the Web does not make for good information.

-- 
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg

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#11103

On 07/01/12 22:55, Steven Simpson wrote:
> Perhaps it's supposed to be 'new Auth.background()', though that's an 
> unconventional name for a class.
>
> Perhaps it's supposed to be 'new Auth.background(new Runnable() { ...'.

D'oh!  For the Runnable case, I meant 'Auth.background(new Runnable() 
{...'.  Too many 'new's.  Not that the extra 'new' was necessarily 
wrong, just not intended.


-- 
ss at comp dot lancs dot ac dot uk

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#11375

On Sat, 07 Jan 2012 22:55:55 +0000, Steven Simpson <ss@domain.invalid>
wrote, quoted or indirectly quoted someone who said :

>It's a syntax error, surely?  Try sticking it in a syntax-aware editor 
>with a 'class X { }' around it.  When I add the closing brace in emacs, 
>I'm told "Mismatched parentheses".

for samples of anonymous classes that will compile, see
http://mindprod.com/jgloss/anonymousclasses.html
-- 
Roedy Green Canadian Mind Products
http://mindprod.com
One of the most useful comments you can put in a program is 
"If you change this, remember to change ?XXX? too".
 

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