how to call java methods in python

[Chris Rebert]

On Tue, Oct 4, 2011 at 12:14 AM, masood shaik <masood.524 at gmail.com> wrote:
> Hi
>  I am trying out my hand on accessing java methods in python. here is
> my piece of code..
>
> Calculator.java
> ---------------
> public class Calculator {
>
>    public Calculator(){
>
>    }
>
>    public double calculateTip(double cost, double tipPercentage){
>        return cost * tipPercentage;
>    }
>
>    public double calculateTax(double cost, double taxPercentage){
>        return cost * taxPercentage;
>    }
>
> }
>
> javaInPython.py
> ---------------
> import Calculator
>
> class javaInPython(Calculator):
>    def __init__(self):
>        pass
>
>    def calculateTotal(self, cost, tip, tax):
>        return cost + self.calculateTip(tip,tax) +
> self.calculateTax(tax,tip)
>
> if __name__ == "__main__":
>    calc = javaInPython()
>    cost = 23.75
>    tip = .15
>    tax = .07
>    print "Starting Cost: ", cost
>    print "Tip Percentage: ", tip
>    print "Tax Percentage: ", tax
>
> Now i am trying to access the calculateTip() and its showing import
> error.
> It works fine when i am running it with jython but why its not
> happening in python.

That's because the integration functionality you're depending upon is
*specific to Jython*. Unlike Jython, CPython does not include an
automatic Java bridge. CPython doesn't feature Java integration; only
Jython does.

(N.B.: CPython is the reference implementation of Python, hosted at python.org.)

Cheers,
Chris