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Re: Java blunders

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From Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups comp.lang.java.programmer
Subject Re: Java blunders
Date Mon, 28 Jul 2014 12:52:49 +0000 (UTC)
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On Mon, 28 Jul 2014 13:22:49 +0100, Chris Uppal wrote:

> Martin Gregorie wrote:
> 
> 
>> Same applies to operator overloading: given a CurrentAccount object ca
>> and a Payment object p there 's little or no difference in clarity
>> between writing
>>
>> ca.acceptPayment(p);
>>
>> and ca += p;
> 
> The latter pattern is used a lot in C# / .Net framework.  For instance
> you use += to add listeners for events.  It keeps the code short, but
> does nothing for clarity IMO.
> 
> Your example of adding a depost to an account using += may make more
> sense, but even there I think it's more "cute" than "clear".  OTOH, if
> Java had (say) "->"
> and "<-" as generic (not Generic) operators for "putting stuff into
> places" and "getting stuff from places" (pace the discusion elsethread
> about notation for IO), then I'd be all for:
> 
>     ca <- p;
>
Yes, Mine wasn't a particularly good example. I should have used a real-
life one. Given: 

- a PICTURE mode (which holds a 2D plottable diagram, 
  scaled and ready to output 

- a SKETCH mode, which holds details of an unscaled item that can
  be plotted after its scaled and positioned in a PICTURE

- a set of modes (RECTANGLE, CIRCLE, TEXT) derived from SKETCH

and given the objects:

RECTANGLE  r;
CIRCLE c;
TEXT t;

you could write

PICTURE p = r + c + t;

which I would say is entirely understandable and unambiguous. Using this 
library I wrote an Algol 68R program that drew a rectangular frame, 
filled it with a number of randomly sized and placed circles, wrote 
'BUBBLES' centred in the frame, and output the completed image on a line 
printer. It was my test piece to make sure I'd installed the graphics 
library correctly. It was a 10 line program and pretty much readable by 
any programmer.

I used the financial example because I thought it would need less 
explanation: obviously a mistake.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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