使用來自JDialog的JFrame填充JList，類的屬性

Question

我有一個擴展JFrame的MainForm類，其中包含一個JList。

現在點擊一個按鈕，彈出一個JDialog，輸入憑據，然后下載一個值列表，這些值將填充在父窗口的Jlist中。

現在如何從我的子類填充mainForm屬性？

MainForm.java

public class MainForm extends JFrame {

static MainForm mainForm;

public static void main(String[] args) {

    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            mainForm = new MainForm();
            mainForm.setVisible(true);
        }
    });
}

    public MainForm() {
               loadUI();
    }

    private void loadUI() {

    JPanel panel = new JPanel();
    getContentPane().add(panel);

            final JList<String> jList = new JList<String>();

            final JButton settings = new JButton(settingImage);
    settings.setBorder(new EmptyBorder(3, 0, 3, 0));
    settings.setBounds(50, 60, 100, 30);
    vertical.add(settings);

    settings.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
             LoginDialog loginDlg = new LoginDialog(mainForm);
             loginDlg.setVisible(true);
             // if logon successfully
             if(loginDlg.isSucceeded()){
                 settings.setText("Hi " + loginDlg.getUsername() + "!");
             }
        }
    });

            add(vertical, BorderLayout.WEST);
    add(jList, BorderLayout.CENTER);

DialogWindow.java

    public LoginDialog(final Frame parent) {
    super(parent, "Login", true);
    //
    JPanel panel = new JPanel(new GridBagLayout());

    //some more lines of code

    btnLogin.addActionListener(new ActionListener() {

        public void actionPerformed(ActionEvent e) {
               ftpAuthenticationVO.setIp(urlIP.getText());
                    ftpAuthenticationVO.setUsername(tfUsername.getText());
                    ftpAuthenticationVO.setPassword(pfPassword.getText());
                    FileUtils.saveFTPDetails(ftpAuthenticationVO);
                    if(ftpConnect.startFTP(CommonConstants.TEMP_TXT_FILE));
                    {
                        List<String> list = readSplitTextFiles.readTextFile(CommonConstants.TEMP_TXT_FILE);
                    //This is the value that is to be populated in the Jlist inside the parent window.  
                    }

Answer 1

只需將JList作為MainForm屬性即可

public class MainForm extends JFrame {

private JList jlist;

.
.
.

private void loadUI() {

    JPanel panel = new JPanel();
    getContentPane().add(panel);

    jList = new JList<String>();

    final JButton settings = new JButton(settingImage);
    settings.setBorder(new EmptyBorder(3, 0, 3, 0));
    settings.setBounds(50, 60, 100, 30);
    vertical.add(settings);
    .
    .
}


public void setJListModel(List<String> list){
   jlist.setModel(new Vector(list));
}

}

在JDialog

 public void actionPerformed(ActionEvent e) {
               ftpAuthenticationVO.setIp(urlIP.getText());
                    ftpAuthenticationVO.setUsername(tfUsername.getText());
                    ftpAuthenticationVO.setPassword(pfPassword.getText());
                    FileUtils.saveFTPDetails(ftpAuthenticationVO);
                    if(ftpConnect.startFTP(CommonConstants.TEMP_TXT_FILE));
                    {
                        List<String> list = readSplitTextFiles.readTextFile(CommonConstants.TEMP_TXT_FILE);
 (MainForm)parent.setJListModel(list);
                    }

父母也必須被宣布為final 。