On Friday 21 February 2003 02:13, "Peter Richards wrote:

> Hi Herman,
>
> Thanks for your replies.
>
> --- In Firebird-Java@yahoogroups.com, Herman Timmermans
>
> <timmermans.herman@s...> wrote:
> > On Thursday 20 February 2003 05:35, "Peter Richards wrote:
> > > 3. I have JBuilder and Delphi (no doubt I can use those with
> > > Firebird). When using Java with Firebird, how different is it to using
> > > a JBuilder/Firebird combination ? I _think_ you can compile with
> > > JBuilder (haven't used it much); can you compile Java, so that you
> > > create an executable, or do you always have to run it as 'scripts' ?
> >
> > Java compiles source into byte code (class files) that is then run
>
> by the
>
> > JAVA Virtual Machine. However, third party tools exist to compile
>
> byte code
>
> > into native machine executable code.....
>
> Okay, thanks. Does JBuilder only create the byte code (class files)
> and not an executable ? Would any of these third party tools be open
> source, and are they reliable, stable, well known products. I would
> prefer not to have scripts or lots of other files in a (Java)
> deployment, being used to one .EXE deploys with Delphi. Or, maybe that
> just isn't possible with Java.

You do not need a lot of scripts to handle this, a normal Java development
environment lets you put class files in a kind of compressed java archive
(like zip files, i.e. a jar file). You can then execute directly the jar
file withe the follwing command java -jar myjarfile.
Other wise you can use compilers. I've' included some links that might be of
some help to you.

http://www.geocities.com/marcoschmidt.geo/jcomp.html#native
http://www.yoda.arachsys.com/java/javaexe.html
http://www.ej-technologies.com/products/exe4j/overview.html

And of course in the Linux open source community you have GNU's Compiler for
Java, please consult the following link : http://gcc.gnu.org/java/

>
> > > 6. How 'easy' are ports from other languages to Java ? For example,
> > > I have an application written in BASIC+, which is the language used by
> > > RevSoft's (http://www.revelation.com) product called OpenInsight.
> > >
> > > For example, here is a commonly used FOR loop, with an embedded IF:
> > >
> > > For y = 1 to Period_cnt
> > > If Transaction_Date >= Period_from<1,y> then
> > > If Transaction_Date <= Period_to<1,y> then
> > > Period = y
> > > end
> > > end
> > > Next y
> > >
> > > I guess if no-one else has done such a port, it's difficult to give an
> > > estimate. (There are over 300 different commands in BASIC+ )
> >
> > I would guess this would require a rewrite (re-design?) of your
>
> application.
>
> > Of course supports a language like Java all classical constructions
>
> like:
> > while statements
> > do statements
> > for statement
> > switch statement
> > if/else clause
> > etc ...
>
> Okay, thanks, so some of the code could be translated/ported, but some
> couldn't. Some would be very tricky, like arrays and data types, etc.
>
> > > 7. Much on the same topic, what about converting event driven
> > > functions, etc (code behind click, double click, form create, etc).
> > > How well do these translate into Java, for use with a Firebird db ?
> >
> > Using Swing components and programming event listeners to handle the
>
> events
>
> > you would be able to achieve this.
>
> It seems I need to do a beginners course in Java, to even come close
> to estimating how easy or otherwise a port would be. I would like to
> think that I could write code to translate most of it, and take the
> hack work out, as a total re-write would take me 'nn' man years.
>
> Thanks,
>
> Peter
>

I'm afraid you are right.
Best regards, Herman

>
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