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  Sun left out something important from their libraries  (Read 1861 times)
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Offline K.I.L.E.R

Senior Devvie




Java games rock!


« Posted 2006-05-09 14:39:45 »

Integer extends Number
[...] extends Number

So why can't I do this?

numberVariable.parseAsSubClass(string)

Instead I have to do this:

Something<? extends Number> variable;
Class<? extends Number> numberType;

if(numberType == Integer.class)
etc....

Good God at the horrible design. :/
Will Sun ever fix this?

Vorax:
Is there a name for a "redneck" programmer?

Jeff:
Unemployed. Wink
Offline kevglass

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« Reply #1 - Posted 2006-05-09 15:05:03 »

Raise an RFE and they *might* eventually - ask Cas Smiley

Kev

Offline princec

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« Reply #2 - Posted 2006-05-09 16:57:46 »

Not entirely sure what he's trying to do here though...

Cas Smiley

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Offline AndersDahlberg

Junior Devvie





« Reply #3 - Posted 2006-05-09 20:01:36 »

java.text.NumberFormat.getInstance().parse(string) ?
Offline K.I.L.E.R

Senior Devvie




Java games rock!


« Reply #4 - Posted 2006-05-09 22:13:20 »

Say what?
It's in there?


java.text.NumberFormat.getInstance().parse(string) ?

Vorax:
Is there a name for a "redneck" programmer?

Jeff:
Unemployed. Wink
Offline Ask_Hjorth_Larsen

Junior Devvie




Java games rock!


« Reply #5 - Posted 2006-05-10 21:54:48 »

If you want to read something without actually knowing which kind of number it is, then that must necessarily mean that you're prepared to accept numbers of type double. So how about just parsing any input as a double? Anything can be expressed sensibly as such, so it covers all bases.

EDIT: Ah, of course. Except in the case of BigDecimal and so on.
Offline Riven
« League of Dukes »

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Exp: 16 years


Hand over your head.


« Reply #6 - Posted 2006-05-10 22:05:01 »

And you cant fit all longs in a double.

Besides that, I don't see any point in this "RFE".

One can alsways make an utility-class. If sun can do you, you can do it too.

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Offline Ask_Hjorth_Larsen

Junior Devvie




Java games rock!


« Reply #7 - Posted 2006-05-11 14:18:44 »

Another thing is that the parseSomething methods are static, so they don't go well with subclasses.
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