Change JDialog Title by JTextField

Question

Hi there!
I got the following problem:
I have a JDialog with a given title "New Task: "
When I enter text into a JTextField, the content of the textfield should be appended to the title... e.g.
1) New Task:
2) New Task: Meeting
3) New Task: Meetin
and so on... difficult to explain...

Answer 1

I really can't see where you're stuck.import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JDialog;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
public class DialogSetTitle extends JDialog {
   String title;
   public DialogSetTitle(String title) {
      super(new Frame(), title);
      this.title = title;
   void makeUI() {
      JTextField textField = new JTextField(20);
      textField.getDocument().
              addDocumentListener(new DocumentListener() {
         @Override
         public void insertUpdate(DocumentEvent e) {
            setTitle(e);
         @Override
         public void removeUpdate(DocumentEvent e) {
            setTitle(e);
         @Override
         public void changedUpdate(DocumentEvent e) {
            setTitle(e);
         private void setTitle(DocumentEvent e) {
            Document document = e.getDocument();
            try {
               String suffix = document.getText(0, document.getLength());
               DialogSetTitle.this.setTitle(title + suffix);
            } catch (BadLocationException ex) {
               ex.printStackTrace();
      setSize(300, 80);
      setLocationRelativeTo(null);
      setLayout(new FlowLayout());
      add(textField);
      addWindowListener(new WindowAdapter() {
         @Override
         public void windowClosing(WindowEvent e) {
            System.exit(0);
      setVisible(true);
   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         @Override
         public void run() {
            new DialogSetTitle("New Task: ").makeUI();
}db