marshal and unmarshal contents of a Jlist to XML file

I have an application for which I need to marshall and unmarshall a list of computer parts in a JList to an XML file. The app has a JList on the left side with computer parts which are selected and transferred to the right side JList. I need a save() method that marshalls the list to an XML file. I also need a load() method that unmarshalls the saved XML file back into an object. I have searched on this site and elsewhere but the code I used to create the app does not quite match what I have seen for other solutions and I cannot resolve it. Here is the code I have:

public class Window {

private JFrame frame;


public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Window window = new Window();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}


public Window() {
    initialize();
}

/**
 * Initialize the contents of the frame. This is where Window Builder
 * will generate its code.
 */
public void initialize() {
    frame = new JFrame();
    frame.setBounds(100, 100, 450, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JMenuBar menuBar = new JMenuBar();
    frame.setJMenuBar(menuBar);

    JMenu mnFile = new JMenu("File");
    menuBar.add(mnFile);

    JMenuItem mntmLoad = new JMenuItem("Load");
    mnFile.add(mntmLoad);

    JMenuItem mntmSave = new JMenuItem("Save");
    mnFile.add(mntmSave);

    JMenuItem mntmExit = new JMenuItem("Exit");
    mntmExit.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            // This code makes the program close.
            System.exit(0);
        }
    });
    mnFile.add(mntmExit);
    GridBagLayout gridBagLayout = new GridBagLayout();
    gridBagLayout.columnWidths = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
    gridBagLayout.rowHeights = new int[]{0, 0, 0, 0, 0, 0, 0};
    gridBagLayout.columnWeights = new double[]{1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, Double.MIN_VALUE};
    gridBagLayout.rowWeights = new double[]{1.0, 1.0, 0.0, 0.0, 0.0, 1.0, Double.MIN_VALUE};
    frame.getContentPane().setLayout(gridBagLayout);

    // Here is where I populate the left panel with the list of computer parts.
    final DefaultListModel<String> leftModel = new DefaultListModel<String>();
    leftModel.addElement("Case");
    leftModel.addElement("Motherboard");
    leftModel.addElement("CPU");
    leftModel.addElement("GPU");
    leftModel.addElement("PSU");
    leftModel.addElement("RAM");
    leftModel.addElement("HDD");

    final JList<String> leftList = new JList<String>(leftModel);

    leftList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    GridBagConstraints gbc_leftList = new GridBagConstraints();
    gbc_leftList.gridwidth = 4;
    gbc_leftList.gridheight = 6;
    gbc_leftList.insets = new Insets(0, 0, 5, 5);
    gbc_leftList.fill = GridBagConstraints.BOTH;
    gbc_leftList.gridx = 0;
    gbc_leftList.gridy = 0;
    frame.getContentPane().add(leftList, gbc_leftList);

    final DefaultListModel<Object> rightModel = new DefaultListModel<Object>();
    final JList<Object> rightList = new JList<Object>(rightModel);
    GridBagConstraints gbc_rightList = new GridBagConstraints();
    gbc_rightList.gridheight = 6;
    gbc_rightList.gridwidth = 4;
    gbc_rightList.insets = new Insets(0, 0, 5, 5);
    gbc_rightList.fill = GridBagConstraints.BOTH;
    gbc_rightList.gridx = 5;
    gbc_rightList.gridy = 0;
    frame.getContentPane().add(rightList, gbc_rightList);

    JButton button = new JButton(">>");
    /** 
     *  The 'for' statement below transfers the selected values from
     *  the left to the right JList.
     *  It includes an 'if' statement to avoid moving a value from
     *  the left if it is already in the right JList.
     */
    button.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            for(Object selectedValue:leftList.getSelectedValuesList()){
                if(!rightModel.contains(selectedValue)) {
                rightModel.addElement(selectedValue);
                }
            }
        }
    });
    GridBagConstraints gbc_button = new GridBagConstraints();
    gbc_button.insets = new Insets(0, 0, 5, 5);
    gbc_button.gridx = 4;
    gbc_button.gridy = 2;
    frame.getContentPane().add(button, gbc_button);

    JButton button_1 = new JButton("<<");
    // This code deletes a selected value from the right JList.
    button_1.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            for(Object selectedValue:rightList.getSelectedValuesList()){
                rightModel.removeElement(selectedValue);
            }
        }
    });
    GridBagConstraints gbc_button_1 = new GridBagConstraints();
    gbc_button_1.insets = new Insets(0, 0, 5, 5);
    gbc_button_1.gridx = 4;
    gbc_button_1.gridy = 3;
    frame.getContentPane().add(button_1, gbc_button_1);
}

I also have a Parts class annotated for JAXB, but I cannot determine how to use it in the save() or load () methods:

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Parts {

@XmlElement(name = "part")
private List<String> part;

public List<String> getPart() { return part; }
public void setPart(List<String> part) { this.part = part; }
}

Can anyone help with this?