PDF2TXT Java GUI

import javax.swing.*;
import java.io.IOException;
import java.nio.file.*;

public class PDf2TXT_GUI extends JFrame{
//define instance variable

// this actually does the GUI program itself
public static void main(String[] args){
    // check if pdf2txt is already installed, install if it isn't
    String userName = System.getProperty("user.name");
    String filePath = "/home/" + userName + "/Packages/pdf2txt_venv_gui";
    Path path = Paths.get(filePath);
    if (!Files.exists(path)){
        try {
            Process p;
            p = Runtime.getRuntime().exec("bash ./GUI_build_wrapper");
            p.waitFor();
            p.destroy();
        } catch (IOException | InterruptedException ex) {
            ex.printStackTrace();
        }
    }


    // create the window itself
    JFrame window = new JFrame();
    window.setSize(500, 350);
    window.setLayout(null);
    window.setLocationRelativeTo(null);
    window.setName(".pdf to .txt converter graphical version 1.0.0");

    //create the label at the top to introduce the program
    JLabel intro = new JLabel("This program runs PDF2TXT graphically.");
    intro.setBounds(125, 25, 450, 20);
    window.add(intro);

    //create the entry fields for the input and output file paths
    //infile
    JTextField infile = new JTextField("input file path");
    infile.setBounds(50, 75, 400, 20);
    window.add(infile);

    //outfile
    JTextField outfile = new JTextField("output file path");
    outfile.setBounds(50, 125, 400, 20);
    window.add(outfile);


    //create a checkbox for whole file or partial file conversion
    JCheckBox wholeFile = new JCheckBox("Convert whole directory?");
    wholeFile.setBounds(152, 175, 300, 20);
    window.add(wholeFile);

    // the run button to execute the program
    JButton run = new JButton("Run PDF2TXT");
    run.setBounds(160, 225, 150, 20);
    window.add(run);


    // this will happen when the run button is pressed.
    run.addActionListener(e -> {
        String inPath = infile.getText();
        String outPath = outfile.getText();
        String convertDirectory = "-f";
        if (wholeFile.isSelected()){ convertDirectory = "-d";}
        String runScript = ("bash ./wrapper " + convertDirectory + " " + inPath + " -o " + outPath);
        System.out.println(runScript);
        try {
            Process p = Runtime.getRuntime().exec(runScript);
            p.waitFor();
            p.destroy();
        } catch (IOException | InterruptedException ex) {
            ex.printStackTrace();
        }
    });

    // make the completed window visible
    window.setVisible(true);
}
}