Comments on: Java and “multi-dispatch”

By: Oren

Oren — Fri, 11 Jan 2008 20:16:06 +0000

1. lets start with reflection

public void draw(Shape e)
{
try
{
Method method = SpecialCanvas.class.getMethod(“draw”,
e.getClass());
return (String) method.invoke(this, e);
}
catch (java.lang.NoSuchMethodException noSuchMethodException)
{
// no need to log noSuchMethodException
log.error(e);
;
}
catch (Exception e1)
{
log.error( e1);
log.error(e);

}
}

I am not sure its that bad.
2. Regarding Generics I need to think it over.

By: Guss

Guss — Thu, 10 Jan 2008 13:49:32 +0000

1. OUCH!
2. I’m not sure how you’d go about using generics to solve this issue – care to share an example ?

By: Oren

Oren — Thu, 10 Jan 2008 11:46:11 +0000

There are sevarel solutions for this issue.
Use reflection to find the function (by its name or annotation).
you can also use common interface with generics.