Re: [Jython-users] Help with interaction with Java types...

[Oti <oh...@ya...>]

[ Ype Kingma, answering Peter Rupp]

> > 4)  When I create an instance of a Java type, running Jython's
> > "type(<variable>) against the instance variable shows me
> >         <jclass.org.python.core.PyJavaInstance at <hex #>>
> >
> >      Is there a way to determine the real Java class type?
> 
> There is, but I'm not sure. In jython you might try:
> yourObject.__tojava__().__class__

You might just use yourObject.__class__, as here:

  Jython 2.1 on java1.4.1-rc (JIT: null)
  >>> from java.util import HashMap
  >>> map = HashMap()
  >>> type( map )
  <jclass org.python.core.PyJavaInstance at 11665455>
  >>> map.__class__
  <jclass java.util.HashMap at 13086732>
  >>> map.__class__ == HashMap
  1
  >>> keySet = map.keySet()
  >>> keySet.__class__
  <jclass java.util.HashMap.KeySet at 5525185>
  >>> keySet.__class__ == HashMap.KeySet
  1
  >>> 

As you see, it works for directly instantiated objects and for results
of method calls, while:

  >>> map.__tojava__().__class__
  Traceback (innermost last):
    File "<console>", line 1, in ?
  AttributeError: __tojava__
  >>> 

AFAIK __tojava__() is used in embedding, e.g. if you want to convert a
PyObject into its java counterpart.

Best wishes, 
Oti.


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