Q: Subclassing java with JPython. How?
Henrik Wetterstrom
henke at news.bahnhof.se
Tue May 23 18:39:53 EDT 2000
Hi,
I am evaluating the combination Java av JPython, and since
I am not that experienced in any of the two, I would like some
guidance.
I am using jpythonc to make a java .class file from a JPython
class. This JPython class inherit from a Java class.
I fail to understand how the subclassed JPython class should be used
from java.
When I look at the java file that jpythonc creates from the
JPython file, every method I would consider to use, have been
made private.
Now consider the following three source files:
--[ Vehicle.java ]-----------------------------
// Java class that will be subclassed by Car.py
public class Vehicle {
public void printLicenseplate() {
System.out.println("ABC123");
}
}
--[ Car.py ]-----------------------------------
# JPython class that will subclass Java Vehicle
import java
import Vehicle
class Car(Vehicle):
def start():
on=1
def stop():
on=0
def printStatus():
if x=0:
print "The car is stopped"
else:
print "The car is running"
--[ VehicleTest.java ]------------------------
// A Java test class just to test the two classes above
import java.lang.*;
import Vehicle;
import Car;
public class VehicleTest {
public static void main(String[] args) {
System.out.println("Starting");
Car c = new Car();
// None of these calls to methods in the
// Car object will be accepted.
c.printLicenseplate();
c.start();
c.printStatus();
}
}
---------------------------------------------
I have searched through lots of places for information
about how this should be done without finding a good
answer. Since the output from jpythonc must be useful
somehow, there must be an obvious answer, but I fail to
see it right now.
Any feedback is greatly appreciated.
Regards,
Henrik W.
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