Dialog Boxes

// Once a <yes|no|maybe> query box and "application" three seconds after
// every choice.  Applet does not run in Netscape.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;

class QueryBox extends Dialog implements ActionListener {
   private String result;
   Button yes, may, not;
   
   QueryBox (Frame f, String question) {
      super (f, question);
      add ("Center", new Label(question, Label.CENTER));
      Panel p = new Panel();
      p.add (yes = new Button("Yes"));
      p.add (may = new Button("Maybe"));
      p.add (not = new Button("No"));
      yes.addActionListener(this);
      may.addActionListener(this);
      not.addActionListener(this);
      add("South", p);
      setSize(200,100);
      show();
   }
   
   synchronized public String answer () {
      try {
         wait();
      }
      catch (Exception e) { }
      return result;
   }
   
   synchronized public void actionPerformed (ActionEvent evt) {
      if (evt.getSource() == yes) result = "Yes";
      else if (evt.getSource() == may) result = "Maybe";
      else if (evt.getSource() == not) result = "No";
      notifyAll();
      dispose();
   }
}

class Application extends Frame implements ActionListener {
   Button b;
   JTextField t, out;
   int i=0;
   
   Application() {
      setLayout(new BorderLayout());
      add ("North", out = new JTextField());
      Panel p = new Panel();
      p.setLayout(new GridLayout(1,2));
      p.add(b = new Button("Press Here"));
      p.add(t = new JTextField());
      b.addActionListener(this);
      add("Center", p);
      out.setEditable(false);
      setSize(200,100);
      show();
   }
   
   public void actionPerformed (ActionEvent evt) {
      if (evt.getSource() == b) t.setText(String.valueOf(i++));
   }
}

public class Query extends Applet implements Runnable, ActionListener {
   String ans;
   Button go;
   JTextField text, out;
   Thread runner;
   int i=0;
   
   public void init () {
      setLayout(new BorderLayout());
      add("North", text = new JTextField());
      Panel p = new Panel();
      p.setLayout(new GridLayout(1,2));
      p.add(go = new Button("Press Here"));
      p.add(out = new JTextField());
      go.addActionListener(this);
      add ("Center", p);
      text.setEditable(false);
      setSize(150,70);
      
      runner = new Thread(this);
      runner.start();
   }

   public void actionPerformed (ActionEvent evt) {
      if (evt.getSource() == go) out.setText(String.valueOf(i++));
   }
   
   public void run () {
      while (true) {
         try {
            runner.sleep(3000);
         }
         catch (Exception e) { }

         Application app = new Application();
         QueryBox query = new QueryBox (app, "Hello There");
         text.setText(ans=query.answer());
         app.out.setText(ans);
      }
   }
}