On Tue, 01 Sep 2020 20:43:55 -0700
Tom Blenko  wrote:

> In article , Martin Gregorie
>  wrote:
>
> > Not true. Java programs using the SWING GUI run just fine on my Linux
> > systems and would run equally well under Windows - no recompilation
> > needed.
>
> Unclear how you intend that to square with your claim that Java (vs.
> JavaScript) is compiled.

 Java is complied into Java Bytecode which is essentially machine
code for an idealised virtual machine (sort of like Pascal P-Code or BCPL
INTCODE). The bytecode runs in a Java Virtual Machine (JVM) which either
interprets, compiles or JIT compiles (most common I think) the bytecode.

 The first time I saw what is now known as JIT was in the Newbrain
BASIC which compiled a line at a time and kept a cache of compiled lines in
spare memory. The technique worked wonders for benchmark scores.

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