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From: "Dr. Michael Paus" <paus@ib-paus.com>
Newsgroups: comp.lang.ada
Subject: Re: Is the Writing on the Wall for Ada?
Date: Tue, 09 Sep 2003 10:19:55 +0200
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Date: 2003-09-09T10:19:55+02:00
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Hi

there is no need to discuss this issue here any longer, because the
problem is well known and will be fixed in the upcoming release of
Java (1.5 Tiger).

http://jcp.org/aboutJava/communityprocess/jsr/tiger/static-import.html

Greetings

Michael

Russ wrote:

> Hyman Rosen <hyrosen@mail.com> wrote in message news:<Mia7b.8477$w41.4485@nwrdny02.gnilink.net>...
> 
>>Russ wrote:
>>
>>>Suppose I want to take the sine of an angle in Java. Can I somehow set
>>>things up so that I can simply write "sin(x)", or must I write
>>>something like "math.sin(x)"? The former is acceptable to me, but the
>>>latter is not.
>>
>>The latter generally. Also for cases like this, 'math' would be a class,
>>not an object, and 'sin' would be a static method. If that's too odious,
>>you can always do this:
>>
>>     class MotherOfAnythingIWouldEverCall
>>     {
>>         double sin(double x) { return math.sin(x); }
>>         // etc.
>>     }
>>
>>     class MyClass extends MotherOfAnythingIWouldEverCall
>>     {
>>         double f(double x) { return sin(sin(x)); }
>>     }
>>
>>But no one would do that. Just pretend you're using Ada in a shop
>>that has forbidden use clauses.
> 
> 
> Then Java was certainly not designed for elegant implementation of
> algorithms.
> 
> Let me give you a brief example of some basic greatcircle calculations
> based on a spherical model of the earth.
> 
> The great circle distance d between two points with coordinates
> {lat1,lon1} and {lat2,lon2} is given by:
> 
> d = 2 * asin(sqrt((sin((lat1-lat2)/2))^2 +
> cos(lat1)*cos(lat2)*(sin((lon1-lon2)/2))^2))
> 
> We obtain the initial course, tc1, (at point 1) from point 1 to point
> 2 by the following. The formula fails if the initial point is a pole.
> 
> tc1 = mod(atan2(sin(lon1-lon2)*cos(lat2),
>            cos(lat1)*sin(lat2)-sin(lat1)*cos(lat2)*cos(lon1-lon2)),
> 2*pi)
> 
> The corresponding equations for the ellipsoidal model of the earth are
> far more complicated, but even these relatively simple equations
> demonstrate the awkwardness of using Java for algorithms. The latter
> expression has no less than 9 math functions plus a constant (pi), and
> you're telling me I must precede each one with "math." (or do some
> other nonstandard trick).
> 
> You can have it.