import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;

import javax.swing.JOptionPane;

import java.awt.*;
import java.awt.event.*;

public class Framework
  extends WindowAdapter
  {
    public int numWindows = 0;
    private Point lastLocation = null;
    private int maxX = 500;
    private int maxY = 500;

    public
    Framework ()
      {
        Dimension screenSize = Toolkit.getDefaultToolkit ().getScreenSize ();
        maxX = screenSize.width - 50;
        maxY = screenSize.height - 50;
        makeNewWindow ();
      }

    public
    void
    makeNewWindow ()
      {
        JFrame frame = new MyFrame (this);
        numWindows++;
        System.out.println ("Number of windows: " + numWindows);

        if (lastLocation != null)
          {
            //Move the window over and down 40 pixels.
            lastLocation.translate (40, 40);

            if ((lastLocation.x > maxX) || (lastLocation.y > maxY))
              {
                lastLocation.setLocation (0, 0);
              }

            frame.setLocation (lastLocation);
          }

        else
          {
            lastLocation = frame.getLocation ();
          }

        System.out.println ("Frame location: " + lastLocation);
        frame.setVisible (true);
      }

    //This method must be evoked from the event-dispatching thread.
    public
    void
    quit (JFrame frame)
      {
        if (quitConfirmed (frame))
          {
            System.out.println ("Quitting.");
            System.exit (0);
          }

        System.out.println ("Quit operation not confirmed; staying alive.");
      }

    private
    boolean
    quitConfirmed (JFrame frame)
      {
        String s1 = "Quit";
        String s2 = "Cancel";
        Object [] options =
          {
            s1,
            s2
          };

        int n = JOptionPane.showOptionDialog (frame, "Windows are still open.\nDo you really want to quit?",
                                              "Quit Confirmation", JOptionPane.YES_NO_OPTION,
                                              JOptionPane.QUESTION_MESSAGE, null, options, s1);

        if (n == JOptionPane.YES_OPTION)
          {
            return true;
          }

        else
          {
            return false;
          }
      }

    public
    void
    windowClosed (WindowEvent e)
      {
        numWindows--;
        System.out.println ("Number of windows = " + numWindows);

        if (numWindows <= 0)
          {
            System.out.println ("All windows gone.  Bye bye!");
            System.exit (0);
          }
      }

    public static
    void
    main (String [] args)
      {
        Framework framework = new Framework();
      }
  }

class MyFrame
  extends JFrame
  {
    protected Dimension defaultSize = new Dimension (200, 200);
    protected Framework framework = null;

    public
    MyFrame (Framework controller)
      {
        super ("New Frame");
        framework = controller;
        setDefaultCloseOperation (DISPOSE_ON_CLOSE);
        addWindowListener (framework);

        JMenu menu = new JMenu ("Window");
        menu.setMnemonic (KeyEvent.VK_W);
        JMenuItem item = null;

        //close
        item = new JMenuItem ("Close");
        item.setMnemonic (KeyEvent.VK_C);
        item.addActionListener (new ActionListener()
          {
            public
            void
            actionPerformed (ActionEvent e)
              {
                System.out.println ("Close window");
                MyFrame.this.setVisible (false);
                MyFrame.this.dispose ();
              }
          });

        menu.add (item);

        //new
        item = new JMenuItem ("New");
        item.setMnemonic (KeyEvent.VK_N);
        item.addActionListener (new ActionListener()
          {
            public
            void
            actionPerformed (ActionEvent e)
              {
                System.out.println ("New window");
                framework.makeNewWindow ();
              }
          });

        menu.add (item);

        //quit
        item = new JMenuItem ("Quit");
        item.setMnemonic (KeyEvent.VK_Q);
        item.addActionListener (new ActionListener()
          {
            public
            void
            actionPerformed (ActionEvent e)
              {
                System.out.println ("Quit request");
                framework.quit (MyFrame.this);
              }
          });

        menu.add (item);

        JMenuBar menuBar = new JMenuBar();
        menuBar.add (menu);
        setJMenuBar (menuBar);

        setSize (defaultSize);
      }
  }

  // Original location: http://java.sun.com/docs/books/tutorial/uiswing/components/example-swing/Framework.java