Using Python in Java GUI

You probably wouldn't want to do this for a final version of your app, but for a quick and dirty approach you can run external programs in java and capture the output. (I've used this before when I was in the process of porting a program from python to java and wanted to see if the java frontend was working before the java back end was finished, without worrying about replacing CPython modules.) This example program runs the python program test.py and prints the output:

import java.io.*;

class Jexec{
    public void Jexec(){}

    private String exec(String execStr){
    try{
        // run process and capture stdout
        Process p = Runtime.getRuntime().exec(execStr);
        InputStream s = p.getInputStream();

        // convert stdout to a string
        BufferedReader br = new BufferedReader(new InputStreamReader(s));  
        StringBuffer sb = new StringBuffer(); 
        String line;  
        while ((line = br.readLine()) != null) {  
        sb.append(line).append("\n");  
        }  
        String output = sb.toString();  

        p.destroy();
        return output.toString();

    }catch(Exception e){
        //actually handle the error here
        e.printStackTrace();
        return String.format("*** Running \"%s\" failed. ***",execStr);
    }
    }

    public static void main(String[] args){
    Jexec je = new Jexec();
    System.out.println(je.exec("python test.py")); //in your case, you would use the output instead of just printing it
    }
}

This is super patchy, so, again, I'd only use it for temporary testing purposes. But for those cases, it is really helpful.