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On Java and C++

Java programmers seem to always be whining about how confusing and
overly complex C++ appears to them. I would like to introduce an
explanation for this. Is it possible that Java programmers simply
aren't smart enough to understand C++?

This is not merely a whimsical hypothesis. Given my experience with
Java programmers --- the code they write and the conversations they
have --- Occam's Razor points to this explanation. For example,

"Oooh I'm confused about the difference between pointers, references,
and objects! How confusing!"

"Oooh operator overloading confuses me! The expression x + y is so
confusing, who knows what's happening with that? If x and y are
complex numbers, what the hell could x + y mean?"

"Oooh multiple inheritance is so confusing! Though I am both a father
and a programmer, I still find it so confusing how the same object can
be two different things! How confusing!"

"Oooh and virtual bases are so bizarre! I am a student --- myself
'the father' is the same student as myself 'the programmer' --- but
nonetheless the idea of virtual bases is absolutely confounding and
confusing to me!"

Again, Occam's Razor is a valuable tool here. In deciding among
competing hypotheses, choose the simplest one. To impartial observers
of indoctrinated Java programmers, the explanation is simple indeed.

Apr 26 '06
458 21557
Roedy Green <my************ *************** ***@munged.inva lid> wrote:
On Thu, 27 Apr 2006 20:09:24 +0200, Martin Vejnr <av****@volny.c z>
wrote, quoted or indirectly quoted someone who said :
For some reason, you've put the most important statement in parentheses.
RAII is one of the two reasons I stick with C++. I don't know of any
other language that would support such concept. (C# and D both support
RAII, but require the programmer to explicitly mark objects that should


The equivalent in Java is called finalizers. This is one of the most
unsatisfactory parts of Java. One problem is guaranteeing ALL the
finalizers will be run on shutdown. The whole business is a bit flaky
and most people avoid using them.


Sorry to jump in, but it's terribly misleading to call finalizers the
Java equivalent of RAII, even with all the qualification above. Without
a doubt, try/finally is the Java equivalent of RAII, with all that is
implied by the asymmetry of the two. I'd hate to see someone misled
into using a finalizer for this.

So what are finalizers good for? Causing programs to run out of memory
by interfering with the garbage collector. That, and pretty much
nothing else, except for MAYBE the possibility of displaying diagnostic
messages telling programmers that they forgot to close a resource, but
it would be best to disable that in a production build to avoid the
program correctness problems that finalizers imply; some kind of ant
magic, perhaps.

--
www.designacourse.com
The Easiest Way To Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation
Apr 28 '06 #131
Roedy Green <my************ *************** ***@munged.inva lid> wrote:
I think we will come to regret type erasure in generics.


"Will come to"? I'd say it more like this: We have been regretting type
erasure in generics for the last year and a half.

--
www.designacourse.com
The Easiest Way To Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation
Apr 28 '06 #132
* Roedy Green:
On Fri, 28 Apr 2006 01:19:40 +0200, "Alf P. Steinbach"
<al***@start.no > wrote, quoted or indirectly quoted someone who said :
Apart from the lack of connection from premise to conclusion, that's not
a fact, it's an excuse for sloppiness.
In java, memory leaks and packratting are quite different problems and
require quite different tools to detect them and quite different
solutions.


Exactly how can the memory leak that cannot exist, be detected and
require a different solution?

If you wished, you could make the same distinction in C++, but you
don't because the distinction does not matter so much for C++.
On the contrary, in C++ it's meaningful to talk about different kinds of
memory leaks, such as when there's still a reference somewhere, what you
call a "packrat", and when there's no reference anywhere. If the case
of no reference couldn't exist, as in Java, then it would be meaningless
to distinguish it. That distinction is meaningless for Java.

there is no way on earth you will convince us that C++ memory
allocation is easier and more fool proof, especially when you don't
even claim to know Java.


I have not made the claims you assert. I don't believe that you talk on
behalf of "us", as you imply. Perversely, I hope you're trolling.

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
Apr 28 '06 #133
On Fri, 28 Apr 2006 05:24:37 +0200, "Alf P. Steinbach"
<al***@start.no > wrote, quoted or indirectly quoted someone who said :

Exactly how can the memory leak that cannot exist, be detected and
require a different solution?


If you discovered a true leak, you have to create an SSCCE and submit
that to the JVM vendor, or the AOT run time vendor.

See http://mindprod.com/jgloss/sscce.html
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
Apr 28 '06 #134
On Thu, 27 Apr 2006 20:56:35 -0600, Chris Smith <cd*****@twu.ne t>
wrote, quoted or indirectly quoted someone who said :
Bingo. There are a lot of things that would make sense about freedom of
choice if you only had to deal with your own code.


One of the more remarkable things about Java is how easily code from
different sources can be cobbled together.

Everything follows the same commenting conventions for example so you
can create Javadoc (automatically generated documentation) as a
unified whole.

This blending works because, for example a HashMap from Source A will
be the exact same beast as a HashMap from Source B. The collection
can be passed freely back and forth without special glue.

Even when you use vendor specific implementations like SQL, JCE
(cryptography), JMF (media), JavaMail (email), vendor packages all
hook up using the same API. Sun has a defined a standard pluggable
API for darn near everything.

You can plug in a free implementation, or a high performance one, or a
special features one. You can have different customers with different
service providers all running the exact same object code.

--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
Apr 28 '06 #135
"Noah Roberts" <ro**********@g mail.com> wrote in message
news:11******** *************@e 56g2000cwe.goog legroups.com...
>Hey, my CPU will run C++ byte code natively but there are no CPU's that
>run Java source code...guess Java sucks then.


There are machines that run Java bytes codes directly. But even such
machines have some microcode or other assembler assists to handle the
lowest levels. see http://mindprod.com/jgloss/picojava.html

[blah blah blah JVM blah blah]


I know all about that. Point is that it was asserted that C++ is not
as good as Java because Java binary code will run on some processors
but C++ source code won't. This is just stupid...almost as stupid as
me having to point this out to you.

I definately hear a vacuum...


If you think you are being witty, vacuum boy, you are falling short.

You can't use 6th grade rhetoric to try to convince a group of people who
have been using Java for years that suddenly it "sucks" because you say so.
You can't ignore counter arguments and expect people not to remember that
one post ago you posted something grossly inaccurate.

You hide behind a thin veil of intelligence - but it only works among the
ignorant. Don't argue with experts about things you don't know. You only
succeed in making yourself look stupid. Almost as stupid as me having to
point this out to you.

--
LTP

:)
Apr 28 '06 #136
"Roedy Green" <my************ *************** ***@munged.inva lid> wrote in
message news:de******** *************** *********@4ax.c om...
Your name Noah, suggests you might be the son of fundamentalist
parents. Fundamentalists are people who are utterly convinced their
faith is the one true faith, and guarantee they never change their
opinion by scrupulously avoiding studying any others.


And then pass it on to their children ;)

--
LTP

:)
Apr 28 '06 #137
On Thu, 27 Apr 2006 19:59:45 -0700, Walter Bright
<wa****@digital mars-nospamm.com> wrote, quoted or indirectly quoted
someone who said :
Operator overloading should be used only for the purpose of making user
defined types work like built-in types.


If operator overloading comes to Java, I would hope that matrix
overloaded plus would not use + (already confusingly meaning both
addition and concatenation See
http://mindprod.com/jgloss/gotchas.html#CONCATENATION
)

I would hope they would use a high Unicode character that looks like +
but would not easily be confused with it such as \u2a01

see http://mindprod.com/jgloss/unicode.html to view the glyphs.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
Apr 28 '06 #138
On Thu, 27 Apr 2006 21:08:49 -0600, Chris Smith <cd*****@twu.ne t>
wrote, quoted or indirectly quoted someone who said :
"Will come to"? I'd say it more like this: We have been regretting type
erasure in generics for the last year and a half.


You and I have certainly, and a number of others. By "we" I mean the
entire Java community including Sun an the inventors of generics.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
Apr 28 '06 #139
if you need power and performance from a language then you can expect
it to be simpler.

java scores in free and special purpose libraries.

Apr 28 '06 #140

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