To who it may concern,
'There was a JSR to add a new mode'
then I suppose I would be asking for that change on float and double, that
being the case,
as well as an extra mathematics class for BigDecimal.
Despite all the time since 1.1, these are necessary changes,
since having to use BigDecimal for all accurate arithmetic begins
to waste memory, instructions, and the presently unavoidable
translation betwee get/set (float or double) and compute (BigDecimal)
and convert to (float or double).
These are in fact not opinions, but very great needs that the Software
community has needed from java for a very long time now,
despite statement in the Java Language Specification.
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Subject: core-libs-dev Digest, Vol 131, Issue 19
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Today's Topics:
1. Re: Floating Point and Arithmetic Changes for Java SE Lnguage
(Bernd Eckenfels)
----------------------------------------------------------------------
Message: 1
Date: Sat, 3 Mar 2018 08:13:12 +0100
From: Bernd Eckenfels <e...@zusammenkunft.net>
To: "core-libs-dev@openjdk.java.net" <core-libs-dev@openjdk.java.net>
Subject: Re: Floating Point and Arithmetic Changes for Java SE Lnguage
Message-ID: <5a9a4b08.4bab500a.97905.f...@mx.google.com>
Content-Type: text/plain; charset="utf-8"
Hello Anon,
It is impossible to Change the Java behavior for already existing Features like
the simple Floating Point types. I would not expect much in this area. There
was a JSR to add a new mode, but it seems to be abandoned:
https://jcp.org/en/jsr/detail?id=84
The Java Community Process(SM) Program - JSRs: Java
...<https://jcp.org/en/jsr/detail?id=84>
jcp.org
This JSR has been Withdrawn Reason: Due to the general absence of interest in
the community, the Specification lead withdrew the JSR. Original Java
Specification ...
I think there was some discussion on Underflow/Overflow handlers, cant remeber
where I have seen it. It seems to be not on the current JEP list:
http://openjdk.java.net/jeps/0
JEP 0: JEP Index<http://openjdk.java.net/jeps/0>
openjdk.java.net
This JEP is the index of all JDK Enhancement Proposals, known as JEPs. See JEP
1 for an overview of the JEP Process.
BTW: please reconsider your communication strategy (especially on Mailing
lists). Marking mails as urgent should only be done if you are sure they are
urgent to all (thousand) receivers, not only to you.
Gruss
Bernd
--
http://bernd.eckenfels.net
Bernd Eckenfels - Home<http://bernd.eckenfels.net/>
bernd.eckenfels.net
Bernd Eckenfels Kurzprofil. Seit 2004 lebe ich in Karlsruhe und seit 1998 mit
Mela Eckenfels verheiratet. Ich arbeite bei einem mittelständischen Software ...
Von: A Z
Gesendet: Samstag, 3. M?rz 2018 04:25
An: core-libs-dev@openjdk.java.net
Betreff: Floating Point and Arithmetic Changes for Java SE Lnguage
Wichtigkeit: Hoch
I have found that double and float types in java are heirs to arithmetic
underflow and overflow at any use.
I have found that presently, floating point is an arithmetic approximation. My
problem is that
the java language needs to be changed here, so that one may have arithmetic
accuracy with
floats and doubles.
There is also a trigonometric shortfall when it comes to BigDecimal.
I have attempted to, and have more carefully described these problems, via the
java bugs database:
JDK-8190947
JDK-8197995
JDK-8190991
JDK-8190946
-These types, as things are, must be computationally discarded, used only in
terms of push and pull,
and be programmed around using BigDecimal, which will be a waste of memory,
program execution speed, and a total confusion due to the lack of any operator
usage options on BigDecimals.
-It is the case that set, get methods, constructors and mutability methods are
all based
around float and double, not BigDecimal, which is part of the previous problem.
-It is the case that setting up BigDecimals can be and is a circumstantial
waste of memory
with very many tasks, combined with the fact that the fact that having to use
BigDecimal
method calls is nowhere near as efficient or legible to developers or
mathematics and enginner
programmers (and useful with their time) as
+, -, *, /, %, +=,-+,*=,/=,%=, ++, --
.This is a syntax argument largely, but also an instruction argument
since BigDecimals have to be set up or used with an extra, thereby second, call.
-It is the case that every other major language includes both floating point
and accuracy mode
options with these two types and or Objects, either as a source code
instruction or as a
compiler switch option. These languages at least provide both options for
floating
point and mathematical accuracy mode.
-It is so that the present arithmetic underflow and underflow are total
disadvantages,
that need only be changed in place, for preconditions and postconditions.
This is in regard to programs that have been compiled and built already.
-It is also the case that the state of Java floating point for the last 10
years or so is not really
any argument, given that things can be changed in place remaining reverse
compatible,
along with how clear and necessary the problem is.
-My Oracle Support technical reviews seem not to recognise these real problems
whatsoever, or
only interpret matters in terms of the Java Language Specification on these
issues,
which of itself possesses inadequecies in these places.
Can someone please reply to me on these things?
Can Oracle update the Java SE language?
End of core-libs-dev Digest, Vol 131, Issue 19
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