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Re: closures

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  Re: closures Roedy Green <see_website@mindprod.com.invalid> - 2014-12-14 16:37 -0800
    Re: closures Robert Klemme <shortcutter@googlemail.com> - 2014-12-16 13:08 +0100

#30568 — Re: closures

On 12 Dec 2014 22:51:33 GMT, ram@zedat.fu-berlin.de (Stefan Ram)
wrote, quoted or indirectly quoted someone who said :

>
>  Today, I wanted to show to the students that inner classes cannot
>  modify fields of outer classes

You may be thinking about methods of an anonymous class can only
reference final local variables of the enclosing method.

see http://mindprod/jgloss/anonymousclasses.html
-- 
Roedy Green Canadian Mind Products http://mindprod.com
Software is a gas; it expands to fill its container.
~ Nathan Myhrvold (born: 1959-08-03 age: 55) Nathan’s First Law

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#30573

On 15.12.2014 01:37, Roedy Green wrote:
> On 12 Dec 2014 22:51:33 GMT, ram@zedat.fu-berlin.de (Stefan Ram)
> wrote, quoted or indirectly quoted someone who said :
>
>>   Today, I wanted to show to the students that inner classes cannot
>>   modify fields of outer classes
>
> You may be thinking about methods of an anonymous class can only
> reference final local variables of the enclosing method.

And, Stefan, note that "this" is final in the method, but members of 
"this" are not, of course.  Much the same way as in this example:

public final class Demo {

   public int counter;

   public static void main(String[] args) {
     final Demo d = new Demo();
     System.out.println(d.counter); // prints 0

     new Runnable() {
       @Override
       public void run() {
         ++d.counter;
       }
     }.run();

     System.out.println(d.counter); // prints 1
   }

}

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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