Using/Creating Python objects with Jython

Question

HI,

lets say I have a Java interface B, something like this. B.java :

public interface B { String FooBar(String s); }

and I want to use it with a Python class D witch inherits B, like this. D.py :

class D(B):
    def FooBar(s)
        return s + 'e'

So now how do I get an instance of D in java? I'm sorry im asking such a n00b question but the Jython doc sucks / is partially off line.

Filip Korling · Accepted Answer · 2009-10-18 08:43:17Z

4

Code for your example above. You also need to change the FooBar implementation to take a self argument since it is not a static method.

You need to have jython.jar on the classpath for this example to compile and run.

import org.python.core.PyObject;
import org.python.core.PyString;
import org.python.util.PythonInterpreter;
public class Main {

    public static B create() 
    {
        PythonInterpreter interpreter = new PythonInterpreter();
        interpreter.exec("from D import D");
        PyObject DClass = interpreter.get("D");

        PyObject DObject = DClass.__call__();
        return (B)DObject.__tojava__(B.class);
    }

    public static void main(String[] args) 
    {
        B b = create();
        System.out.println(b.FooBar("Wall-"));
    }
}

For more info see the chapter on Jython and Java integration in the Jython Book

edited Oct 18, 2009 at 8:43

answered Oct 17, 2009 at 17:51

Filip Korling

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2 Comments

Emma Over a year ago

Links seems broken :(

Joanna Kotuła Over a year ago

Up to date link: jython.readthedocs.io/en/latest/JythonAndJavaIntegration/…

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