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Re: Self-updating relationship

Cross-posted to 2 groups.

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On 09/02/2015 04:18 PM, Stefan Ram wrote:
> Newsgroups: comp.lang.c,comp.lang.java.programmer
> 
> Richard Heathfield <rjh@cpax.org.uk> writes:
>> the programmer. In this case, it was this comment that led me to realise 
>> that the OP was interpreting his "spaces = height - number;" statement 
>> as defining some kind of self-updating relationship (like a spreadsheet 
>> formula).
> 
>   FWIW, in Java, one /can/ program in this way.
> 
> public final class Main
> { public static void main( final java.lang.String[] args )
>   {
> 
>     final javafx.beans.property.IntegerProperty height
>     = new javafx.beans.property.SimpleIntegerProperty( 10 );
> 
>     final javafx.beans.property.IntegerProperty number
>     = new javafx.beans.property.SimpleIntegerProperty(  2 );
> 
>     final javafx.beans.binding.NumberBinding spaces =
>     height.subtract( number );
> 
>     java.lang.System.out.println( spaces.getValue() );
> 
>     height.set( 20 );
> 
>     java.lang.System.out.println( spaces.getValue() ); }} /* prints:
> 
> 8
> 18                                                         */

What's the java feature that makes "spaces" above update automatically?
To put it another way - if I didn't want such updates, what should I
write differently?

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Re: Self-updating relationship James Kuyper <jameskuyper@verizon.net> - 2015-09-02 17:14 -0400
  Re: Self-updating relationship Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-09-02 17:46 -0400
    Re: Self-updating relationship Arne Vajhøj <arne@vajhoej.dk> - 2015-09-03 21:06 -0400
      Re: Self-updating relationship e.d.programmer@gmail.com - 2015-09-04 04:46 -0700
        Re: Self-updating relationship Arne Vajhøj <arne@vajhoej.dk> - 2015-09-04 19:43 -0400
    Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-04 11:49 -0400
      Re: Self-updating relationship Arne Vajhøj <arne@vajhoej.dk> - 2015-09-04 19:45 -0400
        Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-04 22:10 -0400
          Re: Self-updating relationship Arne Vajhøj <arne@vajhoej.dk> - 2015-09-04 22:31 -0400
            Re: Self-updating relationship Arne Vajhøj <arne@vajhoej.dk> - 2015-09-04 22:38 -0400
            Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-04 22:51 -0400
  Re: Self-updating relationship James Kuyper <jameskuyper@verizon.net> - 2015-09-02 18:49 -0400
    Re: Self-updating relationship James Kuyper <jameskuyper@verizon.net> - 2015-09-02 19:28 -0400
      Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-02 23:52 -0400
        Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-03 10:32 -0400
          Re: Self-updating relationship James Kuyper <jameskuyper@verizon.net> - 2015-09-03 10:53 -0400
            Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-03 11:31 -0400
              Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-03 11:35 -0400
              Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-03 11:49 -0400
              Re: Self-updating relationship James Kuyper <jameskuyper@verizon.net> - 2015-09-03 12:16 -0400
                Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-03 13:03 -0400
          Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-03 10:55 -0400
      Re: Self-updating relationship James Kuyper <jameskuyper@verizon.net> - 2015-09-03 00:06 -0400
    Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-02 23:38 -0400
      Re: Self-updating relationship Jeff Higgins <jeff@invalid.invalid> - 2015-09-03 01:22 -0400

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