Jython .py to .class confusion

[Ype Kingma]

Scott,

scott wrote:
> 
> I'm trying to use "jythonc" in Jython 2.1 to create a .class file from a
> .py file. I've read Chapter 9 of Bruce Eckels draft of "Thinking in
> Patterns" (http://64.78.49.204/) which has a section on this very task,
> but I am unable to grok it.
> 
> It looks like I need:
> 1. an "@sig" string as the first line of my method to deal with strong /
> weak typing issues (?something like "@sig public javax.swing.???
> getPicks()" ?)
> 2. Information about Java package creation from the python code.
> Apparently this involves the --package flag of jythonc.
> 
> I'm stuck here. Perhaps if I give a concrete example, someone will show
> the modifications / steps required to create a .class file from this .py
> file.
> 
> Assume this file (loto3.py) is the only file on a floppy disk in a
> Windows 2000 system running Jython 2.1 on Java 1.4.0:
> 
> ---------------------------------------------------
> import random
> import javax.swing as swing
> 
> def getPicks():
>     li = []
>     i = 0
>     numPicks = int(swing.JOptionPane.showInputDialog("How many picks?:
> "))
>     theRange = int((swing.JOptionPane.showInputDialog("What range?: ")))
> + 1
>     while i < numPicks:
>         elem = random.randrange(1, theRange)
>         if elem not in li:
>             li.append(elem)
>             i = i+1
>     conv = str(li)
>     return swing.JOptionPane.showMessageDialog(None, "Your #'s are: " +
> conv)
> 
> getPicks()
> --------------------------------------------------

jythonc expects
class loto3(someJavaClass):
    ....
in the file loto3.py, ie.

import java
class loto3(java.lang.Object):
    def getPicks(self):
        "@sig public java.lang.String getPicks()" # java signature
        ....


And then in another .py file:

import loto3 # or from itsPackage import loto3
yourLoto = loto3.loto3() # iirc.

print yourLoto.getPicks()

It's in the manual at www.jython.org, but the manual is just a bit terse...

Have fun,
Ype

-- 
email at xs4all.nl