Update GUI.java

    private JButton addMoleculeButton;

    private JButton findMoleculeButton;

    private JButton statisticsButton;

    private JButton viewMoleculeButton;

    private JButton displayMoleculeButton;

    private JTextField filePathField;

    private static MoleculeDatabase moleculeDb;

    private static MDB moleculeDb;

    private Socket clientSocket;

    private PrintWriter writer;

    private BufferedReader reader;

        setTitle("Molecule Database");

        setDefaultCloseOperation(EXIT_ON_CLOSE);

        setLayout(new BorderLayout());

        getContentPane().setBackground(Color.BLACK);

        // Create components

        outputTextArea = new JTextArea(20, 50); // the text area for all outputs

        outputTextArea.setBackground(Color.BLACK); // Set the background color of the text area

        outputTextArea.setForeground(Color.WHITE); // Set the text color

        JScrollPane scrollPane = new JScrollPane(outputTextArea);

        chooseFileButton = new JButton("Choose File");

        addMoleculeButton = new JButton("Add Molecule");

        findMoleculeButton = new JButton("Find Molecule");

        statisticsButton = new JButton("Database Statistics");

        viewMoleculeButton = new JButton("Display Molecule");

        displayMoleculeButton = new JButton("Display Molecule");

        filePathField = new JTextField(20); // to show the file path

        JLabel filePathLabel = new JLabel("File Path:");

        filePathLabel.setForeground(Color.WHITE); // Set the text color

        filePathField.setBackground(Color.WHITE); // Set the background color of the text field

        filePathField.setForeground(Color.BLACK); // Set the text color

        // Add components to the JFrame

        JPanel controlPanel = new JPanel();

        controlPanel.setBackground(Color.BLACK);

        controlPanel.add(chooseFileButton);

        controlPanel.add(addMoleculeButton);

        controlPanel.add(findMoleculeButton);

        controlPanel.add(displayMoleculeButton);

        controlPanel.add(statisticsButton);

        controlPanel.add(new JLabel("File Path:"));

        controlPanel.add(filePathLabel);

        controlPanel.add(filePathField);

        add(controlPanel, BorderLayout.NORTH); // to show the control panel (e.g., buttons)

        add(scrollPane, BorderLayout.CENTER); // to show the printed output text area

        // Initialize molecule database

        MoleculeDatabase moleculeDb = new MoleculeDatabase(outputTextArea);

        MDB moleculeDb = new MDB(outputTextArea);

        // Action listener for Choose File button

        chooseFileButton.addActionListener(new ActionListener() {

                // Execute the addMolecule command

                moleculeDb.addMolecule(new Molecule(moleculePath));

                // Display output

                outputTextArea.append("Molecule added: " + moleculePath + "\n");

                outputTextArea.append("Molecule added: " + moleculePath + "\n\n");

            }

        });

                Molecule molecule = moleculeDb.findMolecule(new Molecule(moleculePath));

                // Display the result in the output text area

                if (molecule == null) {

                    outputTextArea.append("NOT FOUND\n");

                    outputTextArea.append("NOT FOUND\n\n");

                } else {

                    outputTextArea.append("FOUND\n");

                    outputTextArea.append("Molecule found: " + moleculePath + "\n");

                    outputTextArea.append("FOUND\n\n");

                    outputTextArea.append("Molecule found: " + moleculePath + "\n\n");

                }

            }

        });

        // Action listener for View Molecule button

        viewMoleculeButton.addActionListener(new ActionListener() {

            @Override

            public void actionPerformed(ActionEvent e) {

        // Action listener for Display Molecule button

//        displayMoleculeButton.addActionListener(new ActionListener() {

//            @Override

//            public void actionPerformed(ActionEvent e) {

//                // Get the molecule path from the text field

//                String moleculePath = moleculePathField.getText();

//                // Instantiate MoleculeViewer and display the molecule

//                String moleculePath = filePathField.getText();

//

//                // Create a new JFrame for displaying the molecule

//                JFrame moleculeViewerFrame = new JFrame("Molecule Viewer");

//                moleculeViewerFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); // Close only the molecule viewer frame

//

//                // Instantiate MoleculeViewer and add it to the frame

//                MoleculeViewer moleculeViewer = new MoleculeViewer(moleculePath);

//                moleculeViewer.setVisible(true);

            }

        });

//                moleculeViewerFrame.getContentPane().add(moleculeViewer);

//

//                // Pack and display the frame

//                moleculeViewerFrame.pack();

//                moleculeViewerFrame.setLocationRelativeTo(null); // Center the frame on the screen

//                moleculeViewerFrame.setVisible(true);

//            }

//        });

        // Action listener for Statistics button

        chooseFileButton.addActionListener(new ActionListener() {

        statisticsButton.addActionListener(new ActionListener() {

            @Override

            public void actionPerformed(ActionEvent e) {

                moleculeDb.printDb(); // print the content of database

     */

    public void initDb(String dbName) throws IOException {

        // Load the database

        moleculeDb = new MoleculeDatabase(outputTextArea);

        moleculeDb = new MDB(outputTextArea);

        File dbFile = new File(dbName);

        if (dbFile.exists()) {

            moleculeDb.load(dbName);