Albrecht Kleine wrote:
>
> FYI: jikes 0.36 (announced here on this list some weeks ago)
> cannot compile next t.java file:
>
> ----------------------------------------------------------
> import java.awt.*;
> import java.awt.event.*;
> class t
> {
> public t()
> {
> int e = 0;
> Button b = new Button();
> b.addActionListener(new ActionListener()
> {
> public void actionPerformed(ActionEvent e)
> {
> System.out.println("actionPerformed:"+e);
> }
> });
> System.out.println("constructor:"+e);
> }
> }
> -----------------------------------------------------------
>
> Note: neither javac nor guavac1.0 (GNU) have any problems
> to compile this.
>
> Any comments ?
This is what I got:
-----------------------------
slackguy$ jikes breaksjikes.java
Found 1 semantic error compiling "breaksjikes.java":
11. public void actionPerformed(ActionEvent e)
^
*** Error: Duplicate declaration of local variable e
--------------------------------
It doesn't like the variable overriding the one in the containing
class. Jikes is a lot pickier than javac; whether this is a better
interpretation of the language spec I'll leave to the language lawyers.
Jikes' interpretation definitely would stop a whole class of
hard-to-diagnose bugs, but would be a bit limiting as well. <shrug>
I have witnessed a more disturbing problem with jikes that I haven't
been able to duplicate with a small piece of code. I have some GUIs with
multiple function buttons - kind of like the various drawing buttons in
an art application. Each are valid under certain circumstances and with
certain things selected, therefore there is a fair amount of
disabling/enabling involved, and a good bit of event passing. If I
compile with javac, it works fine; with jikes things get disabled and
are never enabled. My guesses so far:
1) Jikes has different default initialization behavior
2) Jikes generates different bytecodes, which aggravates a race
condition
I hope to hunt it down soon; I really like jikes' speed and
functionality, and don't mind its anal retentiveness. But in the
meantime I'm cranking out bells and whistles...
--
Paul Reavis [EMAIL PROTECTED]
Design Lead
Partner Software, Inc. http://www.partnersoft.com
