int java.awt.event.WindowEvent.WINDOW_OPENED

  

import java.awt.AWTEvent;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.ActionEvent;
import java.awt.event.ComponentEvent;
import java.awt.event.WindowEvent;

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

public class Main implements AWTEventListener {
  public void eventDispatched(AWTEvent evt) {
    if (evt.getID() == WindowEvent.WINDOW_OPENED) {
      ComponentEvent cev = (ComponentEvent) evt;
      if (cev.getComponent() instanceof JFrame) {
        System.out.println("event: " + evt);
        JFrame frame = (JFrame) cev.getComponent();
        loadSettings(frame);
      }
    }
  }

  public static void loadSettings(JFrame frame) {
    System.out.println("loading");
  }

  public static void saveSettings() {
    System.out.println("saving");
  }

  public static void main(String[] args) throws Exception {
    Toolkit tk = Toolkit.getDefaultToolkit();
    final Main main = new Main();

    tk.addAWTEventListener(main, AWTEvent.WINDOW_EVENT_MASK);

    final JFrame frame = new JFrame("");
    frame.setName("your frame");
    JMenuBar mb = new JMenuBar();
    JMenu menu = new JMenu("File");
    menu.add(new AbstractAction("Quit") {
      public void actionPerformed(ActionEvent evt) {
        try {
          main.saveSettings();
          System.exit(0);
        } catch (Exception ex) {
          System.out.println(ex);
        }
      }
    });
    mb.add(menu);
    frame.setJMenuBar(mb);
    frame.pack();
    frame.setVisible(true);
  }

}

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3.	Register several listeners for one event.
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7.	Multiple sources: A listener can be plugged into several sources.
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int java.awt.event.WindowEvent.WINDOW_OPENED : Event Queue « Event « Java

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