Java reading a file from filechooser and executing two commands

Question

I have this button, which opens the file directory on the computer and from where you can choose the file and execute the commands. I have each of them in a class, but only one of them is running. How can I make it execute first one class and then the other? The codes is at follows:

JButton btnFindMe = new JButton("Find theta");
btnFindMe.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        JFileChooser fctheta = new JFileChooser();
        fctheta.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        int returnVal = fctheta.showOpenDialog(null);
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            final File filetheta = fctheta.getSelectedFile();

            //counts the thetas

            class Inputcontatheta {
                public int main (String [] arg) throws Exception{
                    BufferedReader CSVFile = new BufferedReader (new FileReader (filetheta));
                    String dataRow = CSVFile.readLine();
                    int ii;
                    ii=0;
                    while (dataRow != null && !dataRow.isEmpty()){
                        dataRow = CSVFile.readLine ();
                        ii++;
                    }
                    CSVFile.close ();
                    return ii;
                }
            }
            //  exectues gaussians
            class Inputtheta {
                public void main (String [] arg) throws Exception{
                    Inputcontatheta dimensao= new Inputcontatheta();
                    int x=dimensao.main(arg);
                    BufferedReader CSVFile = new BufferedReader (new FileReader (filetheta));
                    String dataRow = CSVFile.readLine();
                    double [][] gaussiana = new double [x][6];
                    int j;
                    j=0;
                    while (dataRow != null && !dataRow.isEmpty()){
                        String [] dataArray = dataRow.split (",");
                        double[] doubleArray =new double[dataArray.length];
                        int i=0;
                        while (i< dataArray.length ) {
                            doubleArray[i]= Double.parseDouble(dataArray[i]);
                            i++;
                        }
                        gaussiana[j][0]=1.0;
                        gaussiana[j][1]=0.25;
                        gaussiana[j][2]=doubleArray[0];
                        gaussiana[j][3]=-doubleArray[0];
                        gaussiana[j][4]=doubleArray[1];
                        gaussiana[j][5]=doubleArray[2];
                        j++;
                        System.out.println(Arrays.toString(doubleArray));
                        dataRow = CSVFile.readLine();
                    }
                    CSVFile.close ();

                    System.out.println(gaussiana[1][5]);
                    //return gaussiana [][] double;
                }}
            }
        }});

Answer 1

Try transforming your Inputcontatheta and Inputtheta classes into methods of the ActionListener like so:

btnFindMe.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        JFileChooser fctheta = new JFileChooser();
        fctheta.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        int returnVal = fctheta.showOpenDialog(null);
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            File fileTheta = fctheta.getSelectedFile();
            int x = countThetas(fileTheta);
            executeGaussians(fileTheta, x);
        }
    }

    private int countThetas(File fileTheta) {
        // stuff from Inputcontatheta here
    }

    private void executeGaussians(File fileTheta, int x) {
        // stuff from Inputtheta here
    }
});

That being said, maybe instead of just counting the number of rows in your csv file the countThetas method could actually parse the csv file into a double[][] array and you could pass that array to executeGaussians . (You can use java.util.ArrayList if you don't know the length of your data beforehand.)