Re: [Jython-users] implementing an interface (multple inheritance)

[Ype K. <yk...@xs...>]

Eric,

>I would like to integrate some jython into a java source tree.  Some of my
>python modules will need to import classes defined in this project, and in
>at least one case, I need to implement a jython class with multiple
>inheritance from a java class and a java interface.  How must I do this?

Look under 'Interacting with java packages' at:
http://jython.sourceforge.net/docs/index.html

You cannot directly use multiple inheritance from java classes or
interfaces. The workaround is to wrap the java things in Jython first:

import pack1 # java packages on the class path when invoking jython.
import pack2

class wrapintf(pack1.someJavaInterface):
    pass
    # I don't know whether you actually have to implement the interface here.

class wrapcls(pack2.someJavaClass):
    pass

class whatYouAskedFor(wrapcls, wrapintf):
    pass

Off course you can add features to the wrappers before inheriting
from them.


>Finally, are jython objects serializable?

I have never done this, but there is a pickle module as in CPython, iirc.
In case you need Java serialisation: i don't know.

>
>A demo sourcetree of a trival hybrid jython & java program would be VERY
>helpful.

Have a look at Treedemo.py and Console.py in Demos/swing in the jython
distribution. Definitely worth a look for everyone who ever used swing.

Good luck,
Ype