How to select a file using JFileChooser, and the file path is displayed in JtextField after closing the dialog box

I apply your example to the whole program and can’t understand what I need! I want to attach an ActionListener to the button2 button and it does not work! Where is the error? `

 public class JFileDialogTest { private JButton button2 = new JButton(); private JFrame d = new JFrame("Конвертер RPC"); private JTextField f1 = new JTextField(25); private JTextField f2 = new JTextField(25); /** * @param args the command line arguments */ public static void main(String[] args) { SwingUtilities.invokeLater(() -> { JFrame d = new JFrame("Конвертер RPC"); //JTextField textField = new JTextField(); JTextField f1 = new JTextField(25); JTextField f2 = new JTextField(25); JButton button = new JButton("Выбрать"); JButton button1 = new JButton("Сохранить"); JButton button2 = new JButton("Конвертировать"); Component L1 = new JLabel("Файл xml"); Component L2 = new JLabel("Файл txt"); button.addActionListener(e -> { JFileChooser fileChooser = new JFileChooser(); int res = fileChooser.showOpenDialog(d); if (res == JFileChooser.APPROVE_OPTION) { f1.setText(fileChooser.getSelectedFile().getAbsolutePath()); } }); button1.addActionListener(e -> { JFileChooser fileChooser = new JFileChooser(); // FileNameExtensionFilter filter = new FileNameExtensionFilter("txt"); // fileChooser.setFileFilter(filter); int res = fileChooser.showSaveDialog(d); if (res == JFileChooser.APPROVE_OPTION) { f2.setText(fileChooser.getSelectedFile().getAbsolutePath()); } }); ActionListener act = new jfiledialogtest.ClassXmlTest(); button2.addActionListener(act); Container contentPane1 = d.getContentPane(); SpringLayout layout = new SpringLayout(); contentPane1.setLayout(layout); contentPane1.add(f1); contentPane1.add(f2); contentPane1.add(button); contentPane1.add(button1); contentPane1.add(button2); contentPane1.add(L1); contentPane1.add(L2); layout.putConstraint(SpringLayout.WEST , f1, 10, SpringLayout.WEST , contentPane1); layout.putConstraint(SpringLayout.NORTH, f1, 55, SpringLayout.NORTH, contentPane1); // layout.putConstraint(SpringLayout.NORTH, f2, 25, // SpringLayout.NORTH, contentPane1); //layout.putConstraint(SpringLayout.WEST , f1, 120, // SpringLayout.EAST , f1 ); layout.putConstraint(SpringLayout.WEST , f2, 10, SpringLayout.WEST , contentPane1); layout.putConstraint(SpringLayout.NORTH, f2, 150, SpringLayout.NORTH, contentPane1); //layout.putConstraint(SpringLayout.NORTH, f2, 75, // SpringLayout.NORTH, contentPane1); //layout.putConstraint(SpringLayout.WEST , f2, 120, // SpringLayout.EAST , f1 ); layout.putConstraint(SpringLayout.WEST , button, 320, SpringLayout.WEST , contentPane1); layout.putConstraint(SpringLayout.NORTH, button, 50, SpringLayout.NORTH, contentPane1); layout.putConstraint(SpringLayout.WEST , button1, 320, SpringLayout.WEST , contentPane1); layout.putConstraint(SpringLayout.NORTH, button1, 145, SpringLayout.NORTH, contentPane1); layout.putConstraint(SpringLayout.WEST , button2, 150, SpringLayout.WEST , contentPane1); layout.putConstraint(SpringLayout.NORTH, button2, 250, SpringLayout.NORTH, contentPane1); layout.putConstraint(SpringLayout.WEST , L1, 10, SpringLayout.WEST , contentPane1); layout.putConstraint(SpringLayout.NORTH, L1, 40, SpringLayout.NORTH, contentPane1); layout.putConstraint(SpringLayout.WEST , L2, 10, SpringLayout.WEST , contentPane1); layout.putConstraint(SpringLayout.NORTH, L2, 135, SpringLayout.NORTH, contentPane1); // d.add(f1, BorderLayout.NORTH); // d.add(button, BorderLayout.CENTER); //d.pack(); d.setSize(450, 350); d.setLocationRelativeTo(null); d.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); d.setVisible(true); }); //ActionListener act = new JFileDialogTest.ClassXmlTest(); //button2.addActionListener(act); } public class ClassXmlTest implements ActionListener { String str1 = f1.getText(); String str2 = f2.getText(); public ClassXmlTest() { //String str1 = f1.getText(); //String str2 = f2.getText(); File xmlFile = new File(str1); File txtFile = new File(str2); try { transform(xmlFile, txtFile); } catch (Exception e) { e.printStackTrace(); } } @Override public void actionPerformed(ActionEvent e) { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } } public static void transform(File sourceXmlFile, File targetTxtFile) throws Exception { DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder dBuilder = dbFactory.newDocumentBuilder(); org.w3c.dom.Document doc = dBuilder.parse(sourceXmlFile); // doc.getDocumentElement().normalize(); org.w3c.dom.Node element = doc.getElementsByTagName("RPC").item(0); NodeList nodeList = element.getChildNodes(); try (FileWriter fileWriter = new FileWriter(targetTxtFile)) { for (int i = 0; i < nodeList.getLength(); i++) { org.w3c.dom.Node node = nodeList.item(i); String nodeName = node.getNodeName(); String value = node.getTextContent(); String lineSeparator = System.getProperty("line.separator"); switch (nodeName) { case "nLineOff": write(fileWriter, "LINE_OFF", value, "pixels"+ lineSeparator); break; case "nSampOff": write(fileWriter, "SAMP_OFF", value, "pixels"+ lineSeparator); break; case "nLatOff": write(fileWriter, "LAT_OFF", value, "degrees"+ lineSeparator); break; case "nLongOff": write(fileWriter, "LONG_OFF", value, "degrees"+ lineSeparator); break; case "nHeightOff": write(fileWriter, "HEIGHT_OFF", value, "meters"+ lineSeparator); break; case "nLineScale": write(fileWriter, "LINE_SCALE", value, "pixels"+ lineSeparator); break; case "nSampScale": write(fileWriter, "SAMP_SCALE", value, "pixels"+ lineSeparator); break; case "nLatScale": write(fileWriter, "LAT_SCALE", value, "degrees"+ lineSeparator); break; case "nLongScale": write(fileWriter, "LONG_SCALE", value, "degrees"+ lineSeparator); break; case "nHeightScale": write(fileWriter, "HEIGHT_SCALE", value, "meters"+ lineSeparator); break; case "bLineNum": String[] array1 = value.trim().split(","); for (int c = 0; c < array1.length; c++) { write(fileWriter, "LINE_NUM_COEFF_" + (c + 1), array1[c], ""+ lineSeparator); } break; case "bLineDen": String[] array2 = value.trim().split(","); for (int c = 0; c < array2.length; c++) { write(fileWriter, "LINE_DEN_COEFF_" + (c + 1), array2[c], ""+ lineSeparator); } break; case "bSampNum": String[] array3 = value.trim().split(","); for (int c = 0; c < array3.length; c++) { write(fileWriter, "SAMP_NUM_COEFF_" + (c + 1), array3[c], ""+ lineSeparator); } break; case "bSampDen": String[] array4 = value.trim().split(","); for (int c = 0; c < array4.length; c++) { write(fileWriter, "SAMP_DEN_COEFF_" + (c + 1), array4[c], ""+ lineSeparator); } break; } } } } private static void write(FileWriter fileWriter, String name, String value, String what) throws IOException { fileWriter.write(String.format("%s: %s %s\n", name, value, what)); } }` 

Something like this:

  import javax.swing.*; import java.awt.*; public class JFileDialogTest { public static void main(String[] args) { SwingUtilities.invokeLater(() -> { JFrame frame = new JFrame("_________"); JTextField textField = new JTextField(); JButton button = new JButton("Select file"); button.addActionListener(e -> { JFileChooser fileChooser = new JFileChooser(); int res = fileChooser.showOpenDialog(frame); if (res == JFileChooser.APPROVE_OPTION) { textField.setText(fileChooser.getSelectedFile().getAbsolutePath()); } }); frame.add(textField, BorderLayout.NORTH); frame.add(button, BorderLayout.CENTER); frame.pack(); frame.setSize(300, frame.getHeight()); frame.setLocationRelativeTo(null); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); frame.setVisible(true); }); } } 

UPD on the issue from the comment:
You need to adjust the class like this:

  public static class ClassXmlTest implements ActionListener { private JTextField f11; private JTextField f22; public ClassXmlTest(JTextField f11, JTextField f22) { this.f11 = f11; this.f22 = f22; } @Override public void actionPerformed(ActionEvent e) { File xmlFile = new File(f11.getText()); File txtFile = new File(f22.getText()); try { transform(xmlFile, txtFile); } catch (Exception ex) { ex.printStackTrace(); } } } 

then you will do the action like this:

  button2.addActionListener(new ClassXmlTest(f1, f2));