How do I call Java Methods from Jython that is executed by the Java class?

Question

I am a novice programmer in (Java/C++/C#) and I also know Python. I am trying to create a GameEngine in Java that can call Jython scripts, that have access to methods in the Java engine.

I am clueless as to how to approach this. I have already done weeks of research and nothing has answered my question ; that is:

How can I call methods in my Parent class, from my JythonScript, which is executed by my Parent class?

-----------------------------------UPDATE---------------------------------------------------

Okay, The answer here helped me understand some things, but it didn't solve my problem. What I was wondering if something such as this would work:

class MyJavaClass
{
    Public MyJavaClass()
    {
        PythonInterpreter interp = new PythonInterpreter;
        interp.execfile("MyJythonScript.py");
        interp.exec("InGameCommand");
    }

    public void SpawnPlayer()
    {}

    public void KillPlayer()
    {}

}

MyJythonScript.py

Def InGameCommand():
    SpawnPlayer()
    KillPlayer()

Is this even possible? There a way to do this?

-----------------------------------UPDATE---------------------------------------------------

Location to Jython: "C:\jython2.7a2\jython.jar" Location to my work: "C:\Documents and Settings\PC\Desktop\Jython*.java" Location to my local JtyhonJar: "C:\Documents and Settings\PC\Desktop\Jython\jython.jar"

my compiler I wrote: "@echo off" "javac -classpath C:\jython2.7a2\jython.jar *.java" "echo done" "pause >nul"

now it doesn't even compile... (I've changed little things in my code to see if it changed and it hasn't!)

Answer 1

need to jython.jar

1. execute python code in java.

   import org.python.util.PythonInterpreter;  
   public class PythonScript{  
       public static void main(String args[]){  
           PythonInterpreter interpreter = new PythonInterpreter();  
           interpreter.exec("days=('One','Two','Three','Four'); ");  
           interpreter.exec("print days[1];");    
       }
   }  
   

2. invoke python script method in java.

   python script file, named test.py

   def add(a, b):  
       return a + b  
   

   java code:

   import org.python.core.PyFunction;  
   import org.python.core.PyInteger;  
   import org.python.core.PyObject;  
   import org.python.util.PythonInterpreter;  
   
   public class PythonScript {  
       public static void main(String args[]) {  
   
           PythonInterpreter interpreter = new PythonInterpreter();  
           interpreter.execfile("/home/XXX/XXX/test.py");  
           PyFunction pyFuntion = (PyFunction)interpreter.get("add",PyFunction.class);  
   
           int a = 10, b = 20 ;  
           PyObject pyobj = pyFuntion.__call__(new PyInteger(a), new PyInteger(b));  
           System.out.println("result = " + pyobj.toString());  
      }
   }  
   

3. run python script in java

   python script file, named test.py:

   number=[1,10,4,30,7,8,40]  
   print number  
   number.sort()  
   print number  
   

   java code:

   import org.python.util.PythonInterpreter;
   
   public class FirstJavaScript {
   
       public static void main(String args[]) {
            PythonInterpreter interpreter = new PythonInterpreter();
            interpreter.execfile("/home/XXX/XXX/test.py");
       }
   }