Two part answer:
1) Your first example below is the correct syntax to call a static
method like this (given the import, anyway) -- i.e.m
(call java.util.Arrays equals ?array1 ?array2)
2) The problem is that Jess wants to convert Java arrays into Jess
lists, and vice versa, Methods like Arrays.equals() that accept
Object arguments can confuse matters greatly. You call some Java
method that returns an array, and Jess converts it to a Jess list.
Then you pass that list as an argument to a method that wants an
Object, and Jess doesn't understand that you want to convert it back
to an array.
I've been talking to several Jess users lately about overhauling
Jess's handling of Java arrays, and I think we're converging on a
more sensible design. It should even be possible to do this without
breaking existing Jess code. Unfortunately, for now the only general
solution is to use Jess list functions instead; for example, you
could write a deffunction which emulated Arrays.equals() by looping
over the lists.
On Oct 26, 2007, at 12:40 PM, Bogdan Werth wrote:
Hello list,
I am trying to call an equals method in java class Arrays from Jess
and this somehow doesn't work the way I imagined it.
In the online manual to JESS I've read that this is the call for
java classes or objects
(call (<java object>|<java expression>))
So I tried to transfer something that I would write like this in java
Arrays.equals(array1, array2)
into jess like this
(call Arrays equals ?array1 ?array2) or like this (call
(Array.equals) ?array1 ?array2)
However none of these worked. Even with import statement of
java.unil.Arrays it didn't want to work.
Do I do something wrong or does JESS has a problem calling methods
from classes which are not objects?
Thanks a million,
Bogdan
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