示例#1
0
 /** This is the action listener method that the menu items invoke */
 public void actionPerformed(ActionEvent e) {
   String command = e.getActionCommand();
   if (command.equals("quit")) {
     YesNoDialog d =
         new YesNoDialog(
             this, "Really Quit?", "Are you sure you want to quit?", "Yes", "No", null);
     d.addActionListener(
         new ActionListener() {
           public void actionPerformed(ActionEvent e) {
             if (e.getActionCommand().equals("yes")) System.exit(0);
             else textarea.append("Quit not confirmed\n");
           }
         });
     d.show();
   } else if (command.equals("open")) {
     FileDialog d = new FileDialog(this, "Open File", FileDialog.LOAD);
     d.show(); // display the dialog and block until answered
     textarea.append("You selected file: " + d.getFile() + "\n");
     d.dispose();
   } else if (command.equals("about")) {
     InfoDialog d =
         new InfoDialog(
             this,
             "About",
             "This demo was written by David Flanagan\n"
                 + "Copyright (c) 1997 O'Reilly & Associates");
     d.show();
   }
 }