Re: what is Java bytecodes? was a contentious ILE vs CLI debate.

[Vern Hamberg <vhamberg@xxxxxxxxxxxxxxxxxxxxxxxxx>]

Bytecode is an intermediate representation of executable code - between 
source and executable. It is used by an interpreter, rather than having the 
interpreter run from source. This was a technique used all the way back to 
dialects of BASIC. PRINT, e.g., may have been represented by a hex 'FD' or 
whatever.

Java bytecode is interpreted by the Java Runtime Environment into 
executable code, on the fly, for whatever machine you are on. Bytecode is 
the machine-independent part of Java. there are also JIT compilers that 
create executable objects out of bytecode, so that they run faster the next 
time.

I don't think this has anything directly to do with garbage collection.

Anything can generate bytecode - if you knew the specification, you could 
do it in a hex editor by hand. Anyone up for assembly language?

You can probably find better explanations at www.javasoft.com

HTH

Vern

At 10:56 AM 11/3/2003 -0500, you wrote:


> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx
> [mailto:midrange-l-bounces@xxxxxxxxxxxx]On Behalf Of Hans Boldt
> Sent: Monday, November 03, 2003 10:32 AM
> To: midrange-l@xxxxxxxxxxxx
> Subject: Re: ILE vs CLI. was V5R3
>
> >Other languages can and do participate in the Java runtime
> >environment. One such is Jython, a version of Python that generates
> >Java bytecodes. This and others are listed at
> ><http://grunge.cs.tu-berlin.de/~tolk/vmlanguages.html>.
>
>
> I would guess that Java bytecodes is a way for languages to participate in
> the JAVA runtime garbage collection.  Can Jython instantiate a Java class?
> Could RPG generate Java bytecodes?
>
> Basically, the question is, what does Java bytecodes provide in terms of the
> inter language use of classes?  That is, can the Java bytecodes generated by
> the compiling of code in one language be referenced at the source code level
> by a programmer in another language.
>
> thanks,
>
> Steve
>
>
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