JOptionPane: not disappearing properly on seleting "Cancel"

Question

/*takes SQL statement input SQL Input Window, shows table in Center-Right,Tree in Center-Left,
and gives number of records returned in South text field.
import java.awt.*;
import java.awt.event.*;  
import javax.swing.*;                    
import javax.swing.text.BadLocationException;
import javax.swing.table.*;     
import javax.swing.tree.*;
import java.sql.*;   
import java.util.Vector;
public class DataBaseAppCombined
  static DataBaseBrowse1 window;  
  public static void main(String[] args)
    window = new DataBaseBrowse1();    
    Toolkit theKit = window.getToolkit(); 
    Dimension wndSize = theKit.getScreenSize();
    window.setBounds(0, 0,
     wndSize.width,
     wndSize.height);                  
    window.setVisible(true);
class DataBaseBrowse1 extends JFrame implements ActionListener
  public DataBaseBrowse1()
   super("Visual Data");
//This dialog box doesn't respond appropriately to "Cancel" or "No"
   addWindowListener(new WindowAdapter(){
          public void windowClosing(WindowEvent e)
               if (JOptionPane.showConfirmDialog(null,"Do you really want to quit now?")
               == JOptionPane.YES_OPTION)
                    dispose();
                    System.exit(0); 
          // Create the menubar from the menu items
          JMenu fileMenu = new JMenu("File");
          fileMenu.setMnemonic('F');
          fileMenu.add(connectItem);
          connectItem.addActionListener(this);
          fileMenu.add(clearQueryItem);
          clearQueryItem.addActionListener(this);
          fileMenu.add(exitItem);
          exitItem.addActionListener(this);
          menuBar.add(fileMenu);   
    setJMenuBar(menuBar);        
    JPanel commandPane = new JPanel(); //holds label and textArea for SQL queries
    commandPane.setLayout(new BorderLayout());
    commandPane.add(new JLabel("Enter SQL query here: ", JLabel.LEFT),BorderLayout.WEST);
    command.setToolTipText("Key SQL commmand and press Enter");
    command.setLineWrap(true);
    command.setWrapStyleWord(true);
    command.addKeyListener(new KeyHandler());     
    commandPane.add(command, BorderLayout.CENTER);
    getContentPane().add(commandPane, BorderLayout.NORTH);
    // Add the status reporting area at the bottom
    status.setLineWrap(true);
    status.setWrapStyleWord(true);
    status.setEditable(false);
    getContentPane().add(status, BorderLayout.SOUTH);
          // Create a table model to go in right splitPane
          tableModel = new ResultsModel();
          JTable table = new JTable(tableModel);
          table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);  
          tablePane = new JScrollPane(table);
          tablePane.setBorder(BorderFactory.createLineBorder(Color.darkGray));
          //create tree to go in left splitPane
          dbNode = new DefaultMutableTreeNode("No Database");
          dbTreeModel = new DefaultTreeModel(dbNode);
          dbTree = new JTree(dbTreeModel);
          treePane = new JScrollPane(dbTree);
          treePane.setBorder(BorderFactory.createLineBorder(Color.darkGray));
          JSplitPane splitpane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
                   true,        //continuous relayout
                   treePane,    //Left pane content
                   tablePane);  //Right pane content
          getContentPane().add(splitpane, BorderLayout.CENTER);
          splitpane.setDividerLocation(400);
    pack();
    //setVisible(true);
     //get variables out of User object
     //and connect to driver
     public void initializeUser(User _user)
          driver = _user.getDriver();
          url = _user.getURL();
          password = _user.getPassword();
          user = _user.getUser();
          try
               Class.forName(driver);                          
               connection = DriverManager.getConnection(url, user, password);
               statement = connection.createStatement();
               catch(ClassNotFoundException cnfe)
               System.err.println(cnfe);
               catch(SQLException sqle)
               System.err.println(sqle);
  public void actionPerformed(ActionEvent e)
    Object source = e.getSource();
          if(source == clearQueryItem)
          try
           command.getDocument().remove(0,len);
          catch (BadLocationException ex)
                         System.err.println(ex);
    else if(source == exitItem)                
//This dialog box does respond appropriately to "Cancel" and "No".
               if (JOptionPane.showConfirmDialog
               (null,"Do you really want to quit now?")
               == JOptionPane.YES_OPTION)
                    dispose();
                    System.exit(0); 
    else if (source ==connectItem)
         showPasswordDialog();
     public void showPasswordDialog()
           // if first time, construct dialog
           if (dlgPanel == null)
                    dlgPanel = new PasswordChooser();
           // pop up dialog
           if (dlgPanel.showDialog(null,
                    "Connect"))
                    // if accepted, retrieve user input as a User object
                    User u = dlgPanel.getUser();
                    DataBaseBrowse1.this.initializeUser(u);
  public void executeSQL()
    //retrieve the text from the JTextField as SQL statement
    try
               len = command.getDocument().getLength();
               stringIn = command.getDocument().getText(0,len);
               query = stringIn.trim();
               if(query == null) 
      return;
          catch (BadLocationException e)
               System.err.println(e + "bad location");
    try
      tableModel.setResultSet(statement.executeQuery(query));
      status.setText("Resultset has " + tableModel.getRowCount() + " rows.");
    catch (SQLException sqle)
      status.setText(sqle.getMessage());
     class KeyHandler extends KeyAdapter
          //Handler for Enter key events
          public void keyPressed(KeyEvent e)
               int keyCode = e.getKeyCode();
               if (keyCode == e.VK_ENTER)
               executeSQL();
     private DefaultMutableTreeNode dbNode;
     private DefaultTreeModel dbTreeModel;
     private JTree dbTree;
     private JScrollPane tablePane,
                         treePane;
  private JTextArea command = new JTextArea(2,1); // Input area for SQL
  private JTextArea status = new JTextArea(3,1); 
  private String stringIn,query,user, driver,url;
  private String password;
  private int len;
  private PasswordChooser dlgPanel;
  private User u;
  JMenuBar menuBar = new JMenuBar();
  JMenuItem connectItem = new JMenuItem("Connect");
  JMenuItem clearQueryItem = new JMenuItem("Clear query");
  JMenuItem exitItem = new JMenuItem("Exit");
  Connection connection;
  Statement statement;                        
  ResultsModel tableModel;
   A password chooser that is shown inside a dialog
class PasswordChooser extends JPanel
   public PasswordChooser()
          // panel conaining the panel holding the JLabels
          //and the panel holding the JComboBoxes
          panel = new JPanel();
          panel.setLayout(new BorderLayout());
          //panel for textfields
          tfPanel = new JPanel();
          tfPanel.setLayout(new GridLayout(4,1,5,5));
          tfPanel.add(new JLabel("Driver:"));
          tfPanel.add(new JLabel("URL"));
          tfPanel.add(new JLabel("User name:"));
          tfPanel.add(new JLabel("Password:"));
          panel.add(tfPanel,BorderLayout.WEST);
          //panel for comboboxes
          cbPanel = new JPanel();
          cbPanel.setLayout(new GridLayout(4,1,5,5));
          //drivers
          String[] driverChoices ={"sun.jdbc.odbc.JdbcOdbcDriver","other"};
          driverFields =new JComboBox(driverChoices);
          driverFields.setEditable(true);
          cbPanel.add(driverFields);
          //urls
          String[] urlChoices = {"jdbc:odbc:technical_library", "other"};
          urlFields = new JComboBox(urlChoices);
          urlFields.setEditable(true);
          cbPanel.add(urlFields);
          //user and password
          cbPanel.add(userName = new JTextField(""));
          cbPanel.add(password = new JTextField(""));
          panel.add(cbPanel, BorderLayout.CENTER);
          // create Ok and Cancel buttons that terminate the dialog
          JButton okButton = new JButton("Ok");
          okButton.addActionListener(new
               ActionListener()
                    public void actionPerformed(ActionEvent event)
                          ok = true;
                          dialog.setVisible(false);
      JButton cancelButton = new JButton("Cancel");
      cancelButton.addActionListener(new
                ActionListener()
                    public void actionPerformed(ActionEvent event)
                     dialog.setVisible(false);
      // add buttons to southern border
      buttonPanel = new JPanel();
      buttonPanel.add(okButton);
      buttonPanel.add(cancelButton);
      panel.add(buttonPanel, BorderLayout.SOUTH);
      this.add(panel);
   public User getUser()
      return new User((String)driverFields.getSelectedItem(),
                (String)urlFields.getSelectedItem(),
                userName.getText(),
                password.getText());
      Show the chooser panel in a dialog
      @param parent a component in the owner frame or null
      @param title the dialog window title
   public boolean showDialog(Component parent, String title)
      ok = false;
      // locate the owner frame
      Frame owner = null;
      if (parent instanceof Frame)
         owner = (Frame) parent;
      else
         owner = (Frame)SwingUtilities.getAncestorOfClass(
            Frame.class, parent);
      // if first time, or if owner has changed, make new dialog
      if (dialog == null || dialog.getOwner() != owner)
         owner = null;
         dialog = new JDialog(owner, true);
         dialog.getContentPane().add(this);
         dialog.pack();
      // set title and show dialog
      dialog.setTitle(title);
      dialog.setVisible(true);
      return ok;
   private JTextField userName,password;
   private JComboBox driverFields,urlFields;
   private boolean ok;
   private JDialog dialog;
   private JPanel panel,tfPanel,cbPanel, buttonPanel;
   A user has a driver, url, name and password.
class User
   public User(String aDriver, String aURL, String aUser, String aPassword)
             driver =aDriver;
             URL =aURL;
      user = aUser;
      password = aPassword;
   public String getDriver() {return driver;}
   public String getURL() {return URL;}
   public String getUser() { return user; }
   public String getPassword() { return password; }
   private String user,URL,driver;
   private String password;
ResultsModel takes a resultset and draws a table
class ResultsModel extends AbstractTableModel
  String[] columnNames = new String[0];
  Vector dataRows;              // Empty vector of rows
  public void setResultSet(ResultSet results)
    try
      ResultSetMetaData metadata = results.getMetaData();
      int columns =  metadata.getColumnCount();    // Get number of columns
      columnNames = new String[columns];           // Array to hold names
      // Get the column names
      for(int i = 0; i < columns; i++)
        columnNames[i] = metadata.getColumnLabel(i+1);
      // Get all rows.
      dataRows = new Vector();                  // New Vector to store the data
      String[] rowData;                         // Stores one row
      while(results.next())                     // For each row...
        rowData = new String[columns];          // create array to hold the data
        for(int i = 0; i < columns; i++)        // For each column
           rowData[i] = results.getString(i+1); // retrieve the data item
        dataRows.addElement(rowData);           // Store the row in the vector
      fireTableChanged(null);           // Signal the table there is new model data
    catch (SQLException sqle)
      System.err.println(sqle);
  public int getColumnCount()
    return columnNames.length;
  public int getRowCount()
    if(dataRows == null)
      return 0;
    else
      return dataRows.size();
  public Object getValueAt(int row, int column)
    return ((String[])(dataRows.elementAt(row)))[column];
  public String getColumnName(int column)
    return columnNames[column] == null ? "No Name" : columnNames[column];
}

Answer 1

I posted the code before clearly restating my question.
I have two JOptionPanes, noted in the code with comments, which appear on closing the program. The first one is in response to a widow event, the second in response to a File>>Exit event. The code for both is identical, but the first one does not function properly when "Cancel" or No" is pressed. Instead of the dialog diasappearing, the program window disappears, but the program does not exit.I'm not sure quite how to implement DO_NOTHING_ON_CLOSE to solove this, as was suggested.
BTW, the formatting is giving me troubles, despite my efforts to use only necessary tabs and remove comments. I reposted in order to make my listing more readable, but don't think I succeeded.